Examples with ExprEvaluator org.matheclipse.core.eval.ExprEvaluator used on opensource projects

Example 1 with ExprEvaluator

use of org.matheclipse.core.eval.ExprEvaluator in project symja_android_library by axkr.

the class PolynomialExample method main.

public static void main(String[] args) {
    try {
        ExprEvaluator util = new ExprEvaluator();
        IExpr expr = util.evaluate("x^2+y+a*x+b*y+c");
        System.out.println(expr.toString());
        final IAST variables = F.List(F.x, F.y);
        ExprPolynomialRing ring = new ExprPolynomialRing(ExprRingFactory.CONST, variables, variables.size() - 1, ExprTermOrderByName.Lexicographic, false);
        ExprPolynomial poly = ring.create(expr);
        System.out.println(poly.toString());
        // x degree
        System.out.println(poly.degree(0));
        // y degree
        System.out.println(poly.degree(1));
        // show internal structure:
        System.out.println(poly.coefficientRules());
        System.out.println();
        for (ExprMonomial monomial : poly) {
            System.out.println(monomial.toString());
        }
    } catch (SyntaxError e) {
        // catch Symja parser errors here
        System.out.println(e.getMessage());
    } catch (MathException me) {
        // catch Symja math errors here
        System.out.println(me.getMessage());
    } catch (Exception e) {
        e.printStackTrace();
    } catch (final StackOverflowError soe) {
        System.out.println(soe.getMessage());
    } catch (final OutOfMemoryError oome) {
        System.out.println(oome.getMessage());
    }
}

Example 2 with ExprEvaluator

use of org.matheclipse.core.eval.ExprEvaluator in project symja_android_library by axkr.

the class SolveExample method main.

public static void main(String[] args) {
    try {
        ExprEvaluator util = new ExprEvaluator();
        IExpr result = util.evaluate("Solve(2*x==5 + 4*x,x)");
        // print: {{x->-5/2}}
        System.out.println(result.toString());
        result = util.evaluate("Roots(2*x==5+4*x, x)");
        // print: x==-5/2
        System.out.println(result.toString());
    } catch (SyntaxError e) {
        // catch Symja parser errors here
        System.out.println(e.getMessage());
    } catch (MathException me) {
        // catch Symja math errors here
        System.out.println(me.getMessage());
    } catch (Exception e) {
        e.printStackTrace();
    } catch (final StackOverflowError soe) {
        System.out.println(soe.getMessage());
    } catch (final OutOfMemoryError oome) {
        System.out.println(oome.getMessage());
    }
}

Example 3 with ExprEvaluator

use of org.matheclipse.core.eval.ExprEvaluator in project symja_android_library by axkr.

the class SolveSO39753012 method main.

public static void main(String[] args) {
    try {
        ExprEvaluator util = new ExprEvaluator();
        IExpr eq = F.Equal(F.Plus(F.a, F.b), F.c);
        IExpr eq1 = eq.replaceAll(F.Rule(F.a, F.integer(1)));
        eq1 = eq1.replaceAll(F.Rule(F.b, F.integer(2)));
        // Solve(1+2==c, c)
        IExpr result = util.evaluate(F.Solve(eq1, F.c));
        // print: {{c->3}}
        System.out.println(result.toString());
        IExpr eq2 = eq.replaceAll(F.Rule(F.a, F.integer(1)));
        eq2 = eq2.replaceAll(F.Rule(F.c, F.integer(3)));
        // Solve(1+b==3, b)
        result = util.evaluate(F.Solve(eq2, F.b));
        // print: {{b->2}}
        System.out.println(result.toString());
    } catch (SyntaxError e) {
        // catch Symja parser errors here
        System.out.println(e.getMessage());
    } catch (MathException me) {
        // catch Symja math errors here
        System.out.println(me.getMessage());
    } catch (Exception e) {
        e.printStackTrace();
    } catch (final StackOverflowError soe) {
        System.out.println(soe.getMessage());
    } catch (final OutOfMemoryError oome) {
        System.out.println(oome.getMessage());
    }
}

Example 4 with ExprEvaluator

use of org.matheclipse.core.eval.ExprEvaluator in project symja_android_library by axkr.

the class SolveSO43024172 method main.

public static void main(String[] args) {
    try {
        ExprEvaluator util = new ExprEvaluator();
        IExpr expr = util.evaluate("(x1)^2+4*(x2)^2-2*x1-4*x2");
        System.out.println(expr.toString());
        // determine the variables used in the expression
        IAST variableList = VariablesSet.getVariables(expr);
        System.out.println(variableList.toString());
        IExpr a = util.evaluate("a");
        IExpr x1 = util.evaluate("x1");
        IExpr x2 = util.evaluate("x2");
        IExpr x1Substitute = util.evaluate("5+a");
        IExpr x2Substitute = util.evaluate("2");
        IAST astRules = F.List(F.Rule(x1, x1Substitute), F.Rule(x2, x2Substitute));
        // {x1->5+a,x2->2}
        System.out.println(astRules.toString());
        IExpr replacedExpr = expr.replaceAll(astRules);
        // -2*(5+a)+(5+a)^2+(-4)*2+4*2^2
        System.out.println(replacedExpr.toString());
        // 8+(5+a)^2-2*(5+a)
        replacedExpr = util.evaluate(replacedExpr);
        System.out.println(replacedExpr.toString());
        // replacedExpr = util.evaluate(F.ExpandAll(replacedExpr));
        // 23+8*a+a^2
        // System.out.println(replacedExpr.toString());
        IExpr derivedExpr = util.evaluate(F.D(replacedExpr, a));
        // -2+2*(5+a)
        System.out.println(derivedExpr.toString());
        IExpr equation = F.Equal(derivedExpr, F.C0);
        // -2+2*(5+a)==0
        System.out.println(equation.toString());
        IExpr solvedEquation = util.evaluate(F.Solve(equation, a));
        // {{a->-4}}
        System.out.println(solvedEquation.toString());
    } catch (SyntaxError e) {
        // catch Symja parser errors here
        System.out.println(e.getMessage());
    } catch (MathException me) {
        // catch Symja math errors here
        System.out.println(me.getMessage());
    } catch (Exception e) {
        e.printStackTrace();
    } catch (final StackOverflowError soe) {
        System.out.println(soe.getMessage());
    } catch (final OutOfMemoryError oome) {
        System.out.println(oome.getMessage());
    }
}

Example 5 with ExprEvaluator

use of org.matheclipse.core.eval.ExprEvaluator in project symja_android_library by axkr.

the class SymbolicSO43739728 method main.

public static void main(String[] args) {
    try {
        ExprEvaluator util = new ExprEvaluator();
        // (3/4)*(4/3)*Sqrt(2)*I
        IExpr formula = F.Times(F.QQ(3, 4), F.QQ(4, 3), F.Sqrt(F.ZZ(2)), F.CI);
        // symbolic evaluation
        IExpr result = util.evaluate(formula);
        // print: I*Sqrt(2)
        System.out.println(result.toString());
        // numerical evaluations
        result = util.evaluate(F.N(formula));
        // I*1.4142135623730951
        System.out.println(result.toString());
    } catch (SyntaxError e) {
        // catch Symja parser errors here
        System.out.println(e.getMessage());
    } catch (MathException me) {
        // catch Symja math errors here
        System.out.println(me.getMessage());
    } catch (Exception e) {
        e.printStackTrace();
    } catch (final StackOverflowError soe) {
        System.out.println(soe.getMessage());
    } catch (final OutOfMemoryError oome) {
        System.out.println(oome.getMessage());
    }
}