Examples with Matrix gov.sandia.n2a.language.type.Matrix used on opensource projects

Example 26 with Matrix

use of gov.sandia.n2a.language.type.Matrix in project n2a by frothga.

the class RendererCfp method render.

public boolean render(Operator op) {
    if (op == latch) {
        latch = null;
        return super.render(op);
    }
    // one or more exponent parameters to the end of the usual function call.
    if (operatorsWithExponent.contains(op.getClass()))
        return super.render(op);
    // These are ordered to trap specific cases before more general ones.
    if (op instanceof OperatorLogical) {
        // Return the boolean itself if being consumed by a condition or by another logical operator.
        if (op.parent == null || op.parent instanceof OperatorLogical)
            return super.render(op);
        result.append("(");
        escalate(op);
        result.append(" ? ");
        if (op instanceof NOT) {
            result.append("0 : " + print(1, op.exponentNext) + ")");
        } else {
            result.append(print(1, op.exponentNext) + " : 0)");
        }
        return true;
    }
    if (op instanceof Multiply || op instanceof MultiplyElementwise) {
        OperatorBinary b = (OperatorBinary) op;
        // Explanation of shift -- The exponent of the result will be the sum of the exponents
        // of the two operands. That new exponent will be associated with bit position 2*MSB.
        // We want the exponent at bit position MSB.
        // Exponent at MSB position after a direct integer multiply.
        int exponentRaw = b.operand0.exponentNext + b.operand1.exponentNext - Operator.MSB;
        int shift = exponentRaw - b.exponentNext;
        if (shift == 0) {
            escalate(b);
        } else {
            if (b.getType() instanceof Matrix) {
                if (shift > 0) {
                    result.append("shift (");
                    escalate(b);
                    result.append(", " + shift + ")");
                } else {
                    if (b instanceof Multiply || b.operand0.isScalar() || b.operand1.isScalar()) {
                        result.append("multiply (");
                    } else // MultiplyElementwise and both operands are matrices
                    {
                        result.append("multiplyElementwise (");
                    }
                    if (b.operand0.isScalar()) {
                        // Always put the scalar in second position, so we need only one form of multiply().
                        b.operand1.render(this);
                        result.append(", ");
                        b.operand0.render(this);
                    } else {
                        b.operand0.render(this);
                        result.append(", ");
                        b.operand1.render(this);
                    }
                    result.append(", " + -shift + ")");
                }
            } else {
                if (shift > 0) {
                    result.append("(");
                    escalate(b);
                    result.append(" << " + shift);
                    result.append(")");
                } else {
                    if (!parentAccepts64bit(b))
                        result.append("(int32_t) ");
                    result.append("(");
                    if (!provides64bit(b.operand0))
                        result.append("(int64_t) ");
                    escalate(b);
                    result.append(" >> " + -shift);
                    result.append(")");
                }
            }
        }
        return true;
    }
    if (op instanceof Divide) {
        Divide d = (Divide) op;
        // Explanation of shift -- In a division, the quotient is effectively down-shifted by
        // the number of bits in the denominator, and its exponent is the difference between
        // the exponents of the numerator and denominator.
        // Exponent in MSB from a direct integer division.
        int exponentRaw = d.operand0.exponentNext - d.operand1.exponentNext + Operator.MSB;
        int shift = exponentRaw - d.exponentNext;
        if (shift == 0) {
            escalate(d);
        } else {
            if (d.getType() instanceof Matrix) {
                if (shift > 0) {
                    result.append("divide (");
                    d.operand0.render(this);
                    result.append(", ");
                    d.operand1.render(this);
                    result.append(", " + shift + ")");
                } else {
                    result.append("shift (");
                    escalate(d);
                    result.append(", " + shift + ")");
                }
            } else {
                if (shift > 0) {
                    if (!parentAccepts64bit(d))
                        result.append("(int32_t) ");
                    result.append("((");
                    if (!provides64bit(d.operand0))
                        result.append("(int64_t) ");
                    // OperatorBinary.render() will add parentheses around operand0 if it has lower
                    // precedence than division. This includes the case where it has lower precedence
                    // than shift, so we are safe.
                    d.render(this, " << " + shift + ") / ");
                    result.append(")");
                } else {
                    result.append("(");
                    escalate(d);
                    result.append(" >> " + -shift + ")");
                }
            }
        }
        return true;
    }
    if (op instanceof Modulo) {
        Modulo m = (Modulo) op;
        int shift = m.exponent - m.exponentNext;
        if (m.operand0.exponentNext == m.operand1.exponentNext) {
            if (shift == 0)
                return super.render(m);
            result.append("(");
            escalate(m);
            result.append(printShift(shift) + ")");
        } else {
            if (shift != 0)
                result.append("(");
            result.append("modFloor (");
            m.operand0.render(this);
            result.append(", ");
            m.operand1.render(this);
            result.append(", " + m.operand0.exponentNext + ", " + m.operand1.exponentNext + ")");
            if (shift != 0)
                result.append(printShift(shift) + ")");
        }
        return true;
    }
    if (// Add, Subtract, Negate, Transpose
    op instanceof OperatorArithmetic) {
        int exponentOperand;
        if (op instanceof OperatorBinary)
            exponentOperand = ((OperatorBinary) op).operand0.exponentNext;
        else
            exponentOperand = ((OperatorUnary) op).operand.exponentNext;
        int shift = exponentOperand - op.exponentNext;
        if (shift == 0)
            return super.render(op);
        if (op.getType() instanceof Matrix) {
            result.append("shift (");
            escalate(op);
            result.append(", " + shift + ")");
        } else {
            result.append("(");
            // In C++, shift is just below addition in precedence.
            boolean needParens = op.precedence() > new Add().precedence();
            if (needParens)
                result.append("(");
            escalate(op);
            if (needParens)
                result.append(")");
            result.append(printShift(shift));
            result.append(")");
        }
        return true;
    }
    // These are listed in alphabetical order, with a catch-all at the end.
    if (// Actually just an operator, not a function
    op instanceof AccessVariable) {
        AccessVariable av = (AccessVariable) op;
        int shift = av.exponent - av.exponentNext;
        if (shift != 0) {
            if (av.getType() instanceof Matrix)
                result.append("shift ");
            result.append("(");
        }
        result.append(job.resolve(av.reference, this, false));
        if (useExponent && shift != 0) {
            if (av.getType() instanceof Matrix) {
                result.append(", " + shift);
            } else {
                result.append(printShift(shift));
            }
            result.append(")");
        }
        return true;
    }
    if (op instanceof Ceil) {
        Ceil f = (Ceil) op;
        Operator a = f.operands[0];
        // Ceil always sets operands[0].exponentNext to be same as f.exponentNext, so no shift is necessary.
        if (// LSB is above decimal, so ceil() operation is impossible.
        f.exponentNext >= Operator.MSB) {
            a.render(this);
        } else if (// All bits are below decimal
        f.exponentNext < 0) {
            result.append("0");
        } else {
            // Create a mask for bits below the decimal point.
            // When this mask is added to the number, it will add 1 to the first bit position
            // above the decimal if any bit is set under the mask. Afterward, used AND to remove
            // any residual bits below the decimal.
            // This works for both positive and negative numbers.
            int zeroes = Operator.MSB - f.exponentNext;
            int wholeMask = 0xFFFFFFFF << zeroes;
            int decimalMask = ~wholeMask;
            boolean needParens = a.precedence() >= new Add().precedence();
            result.append("(");
            if (needParens)
                result.append("(");
            a.render(this);
            if (needParens)
                result.append(")");
            result.append(" + " + decimalMask + " & " + wholeMask + ")");
        }
        return true;
    }
    if (op instanceof Cosine) {
        Cosine c = (Cosine) op;
        Operator a = c.operands[0];
        int shift = c.exponent - c.exponentNext;
        if (shift != 0)
            result.append("(");
        result.append("cos (");
        a.render(this);
        result.append(", " + a.exponentNext + ")");
        if (shift != 0)
            result.append(printShift(shift) + ")");
        return true;
    }
    if (op instanceof Event) {
        // See comment on OperatorLogical above. Since event() returns a boolean, we follow the same behavior here.
        if (op.parent == null || op.parent instanceof OperatorLogical)
            return super.render(op);
        Event e = (Event) op;
        int exponentRaw = Operator.MSB - e.eventType.valueIndex;
        int shift = exponentRaw - e.exponentNext;
        if (shift != 0)
            result.append("(");
        result.append("(flags & (" + bed.localFlagType + ") 0x1 << " + e.eventType.valueIndex + ")");
        if (shift != 0) {
            result.append(printShift(shift));
            result.append(")");
        }
        return true;
    }
    if (op instanceof Floor) {
        // See Ceil above for similar code.
        Floor f = (Floor) op;
        Operator a = f.operands[0];
        if (f.exponentNext >= Operator.MSB) {
            a.render(this);
        } else if (f.exponentNext < 0) {
            result.append("0");
        } else {
            // Mask off bits below the decimal point. This works for both positive and negative numbers.
            int zeroes = Operator.MSB - f.exponentNext;
            int wholeMask = 0xFFFFFFFF << zeroes;
            boolean needParens = a.precedence() >= new AND().precedence();
            result.append("(");
            if (needParens)
                result.append("(");
            a.render(this);
            if (needParens)
                result.append(")");
            result.append(" & " + wholeMask + ")");
        }
        return true;
    }
    if (op instanceof HyperbolicTangent) {
        HyperbolicTangent ht = (HyperbolicTangent) op;
        Operator a = ht.operands[0];
        int shift = ht.exponent - ht.exponentNext;
        if (shift != 0)
            result.append("(");
        result.append("tanh (");
        a.render(this);
        result.append(", " + a.exponentNext + ")");
        if (shift != 0)
            result.append(printShift(shift) + ")");
        return true;
    }
    if (op instanceof Round) {
        Round r = (Round) op;
        Operator a = r.operands[0];
        int shift = a.exponentNext - r.exponentNext;
        int decimalPlaces = Math.max(0, Operator.MSB - a.exponentNext);
        int mask = 0xFFFFFFFF << decimalPlaces;
        int half = 0;
        if (decimalPlaces > 0)
            half = 0x1 << decimalPlaces - 1;
        if (shift != 0)
            result.append("(");
        // Bitwise operators are low precedence, so we parenthesize them regardless.
        result.append("(");
        boolean needParens = a.precedence() > new Add().precedence();
        if (needParens)
            result.append("(");
        a.render(this);
        if (needParens)
            result.append(")");
        result.append(" + " + half + " & " + mask);
        // Close parens around bitwise operator
        result.append(")");
        if (shift != 0)
            result.append(printShift(shift) + ")");
        return true;
    }
    if (op instanceof Signum) {
        Signum s = (Signum) op;
        Operator a = s.operands[0];
        int one = 0x1 << Operator.MSB - s.exponentNext;
        boolean needParens = a.precedence() >= new LT().precedence();
        if (needParens)
            result.append("(");
        a.render(this);
        if (needParens)
            result.append(")");
        result.append(" < 0 ? " + -one + ":" + one + ")");
        return true;
    }
    if (op instanceof Sine) {
        Sine s = (Sine) op;
        Operator a = s.operands[0];
        int shift = s.exponent - s.exponentNext;
        if (shift != 0)
            result.append("(");
        result.append("sin (");
        a.render(this);
        result.append(", " + a.exponentNext + ")");
        if (shift != 0)
            result.append(printShift(shift) + ")");
        return true;
    }
    if (// AbsoluteValue, Grid, Max, Min
    op instanceof Function) {
        int shift = op.exponent - op.exponentNext;
        if (shift == 0)
            return super.render(op);
        if (op.getType() instanceof Matrix) {
            result.append("shift (");
            escalate(op);
            result.append(", " + shift + ")");
        } else {
            result.append("(");
            escalate(op);
            result.append(printShift(shift) + ")");
        }
        return true;
    }
    return super.render(op);
}

Example 27 with Matrix

use of gov.sandia.n2a.language.type.Matrix in project n2a by frothga.

the class RendererC method render.

public boolean render(Operator op) {
    for (ProvideOperator po : job.extensions) {
        Boolean result = po.render(this, op);
        if (result != null)
            return result;
    }
    if (op instanceof Add) {
        Add a = (Add) op;
        // Check if this is a string expression
        if (a.name != null) {
            result.append(a.name);
            return true;
        }
        return false;
    }
    if (op instanceof AccessElement) {
        AccessElement ae = (AccessElement) op;
        ae.operands[0].render(this);
        if (ae.operands.length == 2) {
            result.append("[");
            ae.operands[1].render(this);
            result.append("]");
        } else if (ae.operands.length == 3) {
            result.append("(");
            ae.operands[1].render(this);
            result.append(",");
            ae.operands[2].render(this);
            result.append(")");
        }
        return true;
    }
    if (op instanceof AccessVariable) {
        AccessVariable av = (AccessVariable) op;
        result.append(job.resolve(av.reference, this, false));
        return true;
    }
    if (op instanceof Atan) {
        Atan atan = (Atan) op;
        int shift = atan.exponent - atan.exponentNext;
        if (useExponent && shift != 0)
            result.append("(");
        if (atan.operands.length > 1 || useExponent)
            result.append("atan2 (");
        else
            result.append("atan (");
        Operator y = atan.operands[0];
        if (y.getType() instanceof Matrix) {
            y.render(this);
            result.append("[1], ");
            y.render(this);
            result.append("[0]");
        } else {
            y.render(this);
            if (atan.operands.length > 1) {
                result.append(", ");
                // x
                atan.operands[1].render(this);
            } else if (useExponent) {
                int shiftX = Operator.MSB - y.exponent;
                int x = shiftX >= 0 ? 0x1 << shiftX : 0;
                result.append(", " + x);
            }
        }
        result.append(")");
        if (useExponent && shift != 0)
            result.append(printShift(shift) + ")");
        return true;
    }
    if (op instanceof BuildMatrix) {
        BuildMatrix b = (BuildMatrix) op;
        result.append(b.name);
        return true;
    }
    if (op instanceof Columns) {
        Columns c = (Columns) op;
        c.operands[0].render(this);
        result.append(".columns ()");
        return true;
    }
    if (op instanceof Constant) {
        Constant c = (Constant) op;
        Type o = c.value;
        if (o instanceof Scalar) {
            result.append(print(((Scalar) o).value, c.exponentNext));
            return true;
        }
        if (o instanceof Text) {
            result.append("\"" + o.toString() + "\"");
            return true;
        }
        if (o instanceof Matrix) {
            result.append(c.name);
            return true;
        }
        return false;
    }
    if (op instanceof Delay) {
        Delay d = (Delay) op;
        if (d.operands.length == 1) {
            result.append("(");
            d.operands[0].render(this);
            result.append(")");
            return true;
        }
        result.append("delay" + d.index + ".step (Simulator<" + job.T + ">::instance.currentEvent->t, ");
        d.operands[1].render(this);
        result.append(", ");
        d.operands[0].render(this);
        result.append(", ");
        if (d.operands.length > 2)
            d.operands[2].render(this);
        else
            result.append("0");
        result.append(")");
        return true;
    }
    if (op instanceof Event) {
        Event e = (Event) op;
        // The cast to bool gets rid of the specific numeric value from flags.
        // If used in a numeric expression, it should convert to either 1 or 0.
        result.append("((bool) (flags & (" + bed.localFlagType + ") 0x1 << " + e.eventType.valueIndex + "))");
        return true;
    }
    if (op instanceof Exp) {
        Exp e = (Exp) op;
        Operator a = e.operands[0];
        result.append("exp (");
        a.render(this);
        if (useExponent)
            result.append(", " + e.exponentNext);
        result.append(")");
        return true;
    }
    if (op instanceof Gaussian) {
        Gaussian g = (Gaussian) op;
        result.append("gaussian<" + job.T + "> (");
        if (g.operands.length > 0) {
            g.operands[0].render(this);
        }
        result.append(")");
        return true;
    }
    if (op instanceof Grid) {
        Grid g = (Grid) op;
        boolean raw = g.operands.length >= 5 && g.operands[4].getString().contains("raw");
        int shift = g.exponent - g.exponentNext;
        if (useExponent && shift != 0)
            result.append("(");
        result.append("grid");
        if (raw)
            result.append("Raw");
        result.append("<" + job.T + "> (");
        int count = Math.min(4, g.operands.length);
        if (count > 0)
            g.operands[0].render(this);
        for (int i = 1; i < count; i++) {
            result.append(", ");
            g.operands[i].render(this);
        }
        result.append(")");
        if (useExponent && shift != 0)
            result.append(printShift(shift) + ")");
        return true;
    }
    if (op instanceof HyperbolicTangent) {
        HyperbolicTangent t = (HyperbolicTangent) op;
        Operator a = t.operands[0];
        result.append("tanh (");
        a.render(this);
        result.append(")");
        return true;
    }
    if (op instanceof Input) {
        Input i = (Input) op;
        result.append(i.name + "->get (");
        if (// return matrix
        i.operands.length < 3 || i.operands[2].getDouble() < 0) {
            boolean time = i.getMode().contains("time");
            String defaultLine = time ? "-INFINITY" : "0";
            if (i.operands.length > 1) {
                Operator op1 = i.operands[1];
                if (// expression for line
                op1.getType() instanceof Scalar)
                    // expression for line
                    op1.render(this);
                else
                    // op1 is probably the mode flag
                    result.append(defaultLine);
            } else // line is not specified. We're probably just retrieving a dummy matrix to get column count.
            {
                result.append(defaultLine);
            }
        } else // return scalar
        {
            i.operands[1].render(this);
            result.append(", ");
            i.operands[2].render(this);
        }
        result.append(")");
        return true;
    }
    if (op instanceof Log) {
        Log l = (Log) op;
        Operator a = l.operands[0];
        result.append("log (");
        a.render(this);
        if (useExponent)
            result.append(", " + a.exponentNext + ", " + l.exponentNext);
        result.append(")");
        return true;
    }
    if (op instanceof Max) {
        Max m = (Max) op;
        for (int i = 0; i < m.operands.length - 1; i++) {
            Operator a = m.operands[i];
            result.append("max (");
            renderType(a);
            result.append(", ");
        }
        Operator b = m.operands[m.operands.length - 1];
        renderType(b);
        for (int i = 0; i < m.operands.length - 1; i++) result.append(")");
        return true;
    }
    if (op instanceof Min) {
        Min m = (Min) op;
        for (int i = 0; i < m.operands.length - 1; i++) {
            Operator a = m.operands[i];
            result.append("min (");
            renderType(a);
            result.append(", ");
        }
        Operator b = m.operands[m.operands.length - 1];
        renderType(b);
        for (int i = 0; i < m.operands.length - 1; i++) result.append(")");
        return true;
    }
    if (op instanceof Modulo) {
        Modulo m = (Modulo) op;
        Operator a = m.operand0;
        Operator b = m.operand1;
        result.append("modFloor (");
        moduloParam(a);
        result.append(", ");
        moduloParam(b);
        result.append(")");
        return true;
    }
    if (op instanceof Norm) {
        Norm n = (Norm) op;
        Operator A = n.operands[0];
        result.append("norm (");
        A.render(this);
        result.append(", ");
        n.operands[1].render(this);
        if (useExponent)
            result.append(", " + A.exponentNext + ", " + n.exponentNext);
        result.append(")");
        return true;
    }
    if (op instanceof Output) {
        Output o = (Output) op;
        result.append(o.name + "->trace (Simulator<" + job.T + ">::instance.currentEvent->t, ");
        if (// column name is explicit
        o.hasColumnName) {
            o.operands[2].render(this);
        } else // column name is generated, so use prepared string value
        {
            result.append(o.columnName);
        }
        result.append(", ");
        o.operands[1].render(this);
        if (useExponent)
            result.append(", " + o.operands[1].exponentNext);
        result.append(", ");
        if (// No mode string
        o.operands.length < 4) {
            // null
            result.append("0");
        } else if (// Mode string is constant
        o.operands[3] instanceof Constant) {
            result.append("\"" + o.operands[3] + "\"");
        } else if (// Mode string is calculated
        o.operands[3] instanceof Add) {
            Add a = (Add) o.operands[3];
            // No need for cast or call c_str()
            result.append(a.name);
        }
        // else badness
        result.append(")");
        return true;
    }
    if (op instanceof Power) {
        Power p = (Power) op;
        Operator a = p.operand0;
        Operator b = p.operand1;
        result.append("pow (");
        a.render(this);
        result.append(", ");
        b.render(this);
        if (useExponent)
            result.append(", " + a.exponentNext + ", " + p.exponentNext);
        result.append(")");
        return true;
    }
    if (op instanceof Pulse) {
        Pulse p = (Pulse) op;
        Operator t = p.operands[0];
        result.append("pulse (");
        renderType(t);
        for (int i = 1; i < p.operands.length; i++) {
            result.append(", ");
            renderType(p.operands[i]);
        }
        result.append(")");
        return true;
    }
    if (op instanceof ReadMatrix) {
        ReadMatrix r = (ReadMatrix) op;
        // Currently, ReadMatrix sets its exponent = exponentNext, so we will never do a shift here.
        // Any shifting should be handled by matrixHelper while loading and converting the matrix to integer.
        // matrices are held in pointers, so need to dereference
        result.append("*" + r.name + "->A");
        return true;
    }
    if (op instanceof Rows) {
        Rows r = (Rows) op;
        r.operands[0].render(this);
        result.append(".rows ()");
        return true;
    }
    if (op instanceof Sat) {
        Sat s = (Sat) op;
        Operator a = s.operands[0];
        Operator lower = s.operands[1];
        Operator upper;
        if (s.operands.length >= 3)
            upper = s.operands[2];
        else
            upper = lower;
        result.append("max (");
        if (s.operands.length == 2)
            result.append("-1 * (");
        renderType(lower);
        if (s.operands.length == 2)
            result.append(")");
        result.append(", min (");
        renderType(upper);
        result.append(", ");
        renderType(a);
        result.append("))");
        return true;
    }
    if (op instanceof SquareRoot) {
        SquareRoot s = (SquareRoot) op;
        Operator a = s.operands[0];
        result.append("sqrt (");
        a.render(this);
        if (useExponent)
            result.append(", " + a.exponentNext + ", " + s.exponentNext);
        result.append(")");
        return true;
    }
    if (op instanceof SumSquares) {
        SumSquares ss = (SumSquares) op;
        Operator A = ss.operands[0];
        result.append("sumSquares (");
        A.render(this);
        if (useExponent)
            result.append(", " + A.exponentNext + ", " + ss.exponentNext);
        result.append(")");
        return true;
    }
    if (op instanceof Tangent) {
        Tangent t = (Tangent) op;
        Operator a = t.operands[0];
        result.append("tan (");
        a.render(this);
        if (useExponent)
            result.append(", " + a.exponentNext + ", " + t.exponentNext);
        result.append(")");
        return true;
    }
    if (op instanceof Uniform) {
        Uniform u = (Uniform) op;
        result.append("uniform<" + job.T + "> (");
        for (int i = 0; i < u.operands.length; i++) {
            if (i > 0)
                result.append(", ");
            u.operands[i].render(this);
        }
        result.append(")");
        return true;
    }
    return super.render(op);
}

Example 28 with Matrix

use of gov.sandia.n2a.language.type.Matrix in project n2a by frothga.

the class Sphere method simplify.

public Operator simplify(Variable from, boolean evalOnly) {
    if (operands.length == 0) {
        // No need to set from.changed
        operands = new Operator[1];
        Operator sigma = new Constant(new MatrixDense(3, 1, 1));
        sigma.parent = this;
        operands[0] = sigma;
        return this;
    }
    // Any number of operands >= 1. We only pay attention to first operand.
    operands[0] = operands[0].simplify(from, evalOnly);
    Operator sigma = operands[0];
    if (sigma.isScalar()) {
        if (sigma.getDouble() == 0) {
            // Needed because we are replacing ourself with a simpler constant.
            from.changed = true;
            sigma.parent = parent;
            return sigma;
        }
        // No need to set from.changed
        operands = new Operator[1];
        sigma = new Constant(new MatrixDense(3, 1, sigma.getDouble()));
        sigma.parent = this;
        operands[0] = sigma;
        return this;
    } else if (sigma instanceof Constant) {
        Constant cs = (Constant) sigma;
        if (cs.value instanceof Matrix) {
            // No need to set from.changed for any of the transforms below ...
            Matrix A = (Matrix) cs.value;
            int rows = A.rows();
            int cols = A.columns();
            if (rows == 1 && cols > 1) {
                cs.value = A = A.transpose();
                rows = cols;
                cols = 1;
            }
            if (// Check for zeroes in single column.
            cols == 1) {
                int rank = (int) A.norm(0);
                if (rank < rows) {
                    from.changed = true;
                    MatrixDense B = new MatrixDense(rows, rank);
                    cs.value = B;
                    int c = 0;
                    for (int r = 0; r < rows; r++) {
                        double value = A.get(r);
                        if (value != 0)
                            B.set(r, c++, value);
                    }
                }
            }
        // Don't bother checking for columns that are all zeroes.
        // Since sigma is a constant, this should be obvious to the user.
        }
    }
    return this;
}

Example 29 with Matrix

use of gov.sandia.n2a.language.type.Matrix in project n2a by frothga.

the class Sphere method eval.

// This code assumes that simplify() has been run, so operand 0 is a matrix of correct form.
public Type eval(Instance context) throws EvaluationException {
    Random random;
    Simulator simulator = Simulator.instance.get();
    if (simulator == null)
        random = new Random();
    else
        random = simulator.random;
    Matrix sigma = (Matrix) operands[0].eval(context);
    int rows = sigma.rows();
    int cols = sigma.columns();
    int dimension = cols == 1 ? rows : cols;
    MatrixDense temp = new MatrixDense(dimension, 1);
    for (int r = 0; r < dimension; r++) temp.set(r, random.nextGaussian());
    temp = temp.multiply(new Scalar(Math.pow(random.nextDouble(), 1.0 / dimension) / temp.norm(2)));
    if (cols == 1)
        return sigma.multiplyElementwise(temp);
    return sigma.multiply(temp);
}

Example 30 with Matrix

use of gov.sandia.n2a.language.type.Matrix in project n2a by frothga.

the class SumSquares method determineExponent.

public void determineExponent(ExponentContext context) {
    // This function is related to both Norm and Power. See those classes for similar processing.
    // A
    Operator op0 = operands[0];
    op0.determineExponent(context);
    // Determine number of elements in A
    Instance instance = new Instance() {

        // all AccessVariable objects will reach here first, and get back the Variable.type field
        public Type get(VariableReference r) throws EvaluationException {
            return r.variable.type;
        }
    };
    Matrix A = (Matrix) op0.eval(instance);
    int Asize = A.rows() * A.columns();
    if (op0.exponent != UNKNOWN) {
        // log2(Asize)
        int shift = (int) Math.floor(Math.log(Asize) / Math.log(2));
        int centerNew = MSB / 2;
        int exponentNew = op0.centerPower() * 2 + shift + MSB - centerNew;
        updateExponent(context, exponentNew, centerNew);
    }
}