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

Example 26 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, IASTAppendable 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.ZZ(lExp)));
                }
            } else {
                return false;
            }
        }
    }
    return true;
}

Example 27 with ExpVector

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

the class JASConvert 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
 */
private static boolean isQuadratic(GenPolynomial<edu.jas.arith.BigInteger> poly, edu.jas.arith.BigInteger[] result) {
    if (poly.degree() <= 2 && poly.numberOfVariables() == 1) {
        result[0] = edu.jas.arith.BigInteger.ZERO;
        result[1] = edu.jas.arith.BigInteger.ZERO;
        result[2] = edu.jas.arith.BigInteger.ZERO;
        for (Monomial<edu.jas.arith.BigInteger> monomial : poly) {
            edu.jas.arith.BigInteger 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 28 with ExpVector

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

the class JASConvert 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
 */
private 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 29 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, JASConversionException {
    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 {
        IASTAppendable result = F.PlusAlloc(val.size());
        for (Map.Entry<ExpVector, AlgebraicNumber<BigRational>> m : val.entrySet()) {
            AlgebraicNumber<BigRational> coeff = m.getValue();
            ExpVector exp = m.getKey();
            IASTAppendable monomTimes = F.TimesAlloc(exp.length() + 1);
            monomialToExpr(coeff, exp, monomTimes);
            result.append(monomTimes.oneIdentity1());
        }
        return result;
    }
}