Examples with ExpVector edu.jas.poly.ExpVector used on opensource projects

Example 16 with ExpVector

use of edu.jas.poly.ExpVector in project symja_android_library by axkr.

the class Integrate method isQuadratic.

/**
	 * Check if the polynomial has maximum degree 2 in 1 variable and return the
	 * coefficients.
	 * 
	 * @param poly
	 * @return <code>false</code> if the polynomials degree > 2 and number of
	 *         variables <> 1
	 */
public static boolean isQuadratic(GenPolynomial<BigRational> poly, BigRational[] result) {
    if (poly.degree() <= 2 && poly.numberOfVariables() == 1) {
        result[0] = BigRational.ZERO;
        result[1] = BigRational.ZERO;
        result[2] = BigRational.ZERO;
        for (Monomial<BigRational> monomial : poly) {
            BigRational coeff = monomial.coefficient();
            ExpVector exp = monomial.exponent();
            for (int i = 0; i < exp.length(); i++) {
                result[(int) exp.getVal(i)] = coeff;
            }
        }
        return true;
    }
    return false;
}

Example 17 with ExpVector

use of edu.jas.poly.ExpVector in project symja_android_library by axkr.

the class JASConvert method polyAlgebraicNumber2Expr.

public IAST polyAlgebraicNumber2Expr(final GenPolynomial<AlgebraicNumber<BigRational>> poly) throws ArithmeticException, ClassCastException {
    if (poly.length() == 0) {
        return F.Plus(F.C0);
    }
    SortedMap<ExpVector, AlgebraicNumber<BigRational>> val = poly.getMap();
    if (val.size() == 0) {
        return F.Plus(F.C0);
    } else {
        IAST result = F.Plus();
        for (Map.Entry<ExpVector, AlgebraicNumber<BigRational>> m : val.entrySet()) {
            AlgebraicNumber<BigRational> coeff = m.getValue();
            IAST monomTimes = F.Times();
            ExpVector exp = m.getKey();
            monomialToExpr(coeff, exp, monomTimes);
            result.append(monomTimes.getOneIdentity(F.C1));
        }
        return result;
    }
}

Example 18 with ExpVector

use of edu.jas.poly.ExpVector in project symja_android_library by axkr.

the class JASConvert method integerPoly2Expr.

/**
	 * Convert a JAS integer polynomial to <code>IExpr</code>.
	 * 
	 * @param poly
	 * @return
	 * @throws ArithmeticException
	 * @throws ClassCastException
	 */
public IExpr integerPoly2Expr(final GenPolynomial<edu.jas.arith.BigInteger> poly) throws ArithmeticException, ClassCastException {
    if (poly.length() == 0) {
        return F.C0;
    }
    IAST result = F.PlusAlloc(poly.length());
    for (Monomial<edu.jas.arith.BigInteger> monomial : poly) {
        edu.jas.arith.BigInteger coeff = monomial.coefficient();
        ExpVector exp = monomial.exponent();
        IAST monomTimes = F.Times();
        monomialToExpr(coeff, exp, monomTimes);
        result.append(monomTimes.getOneIdentity(F.C1));
    }
    return result.getOneIdentity(F.C0);
}

Example 19 with ExpVector

use of edu.jas.poly.ExpVector in project symja_android_library by axkr.

the class JASConvert method expVectorToExpr.

private boolean expVectorToExpr(ExpVector exp, IAST monomTimes) {
    long lExp;
    ExpVector leer = fPolyFactory.evzero;
    for (int i = 0; i < exp.length(); i++) {
        lExp = exp.getVal(i);
        if (lExp != 0) {
            int ix = leer.varIndex(i);
            if (ix >= 0) {
                if (lExp == 1L) {
                    monomTimes.append(fVariables.get(ix));
                } else {
                    monomTimes.append(F.Power(fVariables.get(ix), F.integer(lExp)));
                }
            } else {
                return false;
            }
        }
    }
    return true;
}

Example 20 with ExpVector

use of edu.jas.poly.ExpVector in project symja_android_library by axkr.

the class JASIExpr method integerPoly2Expr.

/**
	 * Convert a JAS integer polynomial to <code>IExpr</code>.
	 * 
	 * @param poly
	 * @return
	 * @throws ArithmeticException
	 * @throws ClassCastException
	 */
public IExpr integerPoly2Expr(final GenPolynomial<edu.jas.arith.BigInteger> poly) throws ArithmeticException, ClassCastException {
    if (poly.length() == 0) {
        return F.C0;
    }
    IAST result = F.Plus();
    for (Monomial<edu.jas.arith.BigInteger> monomial : poly) {
        edu.jas.arith.BigInteger coeff = monomial.coefficient();
        ExpVector exp = monomial.exponent();
        IInteger coeffValue = F.integer(coeff.getVal());
        IAST monomTimes = F.Times(coeffValue);
        long lExp;
        for (int i = 0; i < exp.length(); i++) {
            lExp = exp.getVal(i);
            if (lExp != 0) {
                monomTimes.append(F.Power(fVariables.get(i), F.integer(lExp)));
            }
        }
        if (monomTimes.isAST1()) {
            result.append(monomTimes.arg1());
        } else {
            result.append(monomTimes);
        }
    }
    if (result.isAST1()) {
        return result.arg1();
    } else {
        return result;
    }
}