Examples with ExprPolynomial org.matheclipse.core.polynomials.longexponent.ExprPolynomial used on opensource projects

Example 11 with ExprPolynomial

use of org.matheclipse.core.polynomials.longexponent.ExprPolynomial in project symja_android_library by axkr.

the class RootsFunctions method rootsOfQuadraticExprPolynomial.

/**
 * Solve a polynomial with degree <= 2.
 *
 * @param expr
 * @param varList
 * @return <code>F.NIL</code> if no evaluation was possible.
 */
private static IAST rootsOfQuadraticExprPolynomial(final IExpr expr, IAST varList) {
    IASTMutable result = F.NIL;
    try {
        // try to generate a common expression polynomial
        ExprPolynomialRing ring = new ExprPolynomialRing(ExprRingFactory.CONST, varList);
        ExprPolynomial ePoly = ring.create(expr, false, false, false);
        ePoly = ePoly.multiplyByMinimumNegativeExponents();
        result = rootsOfQuadraticPolynomial(ePoly);
        if (result.isPresent() && expr.isNumericMode()) {
            for (int i = 1; i < result.size(); i++) {
                result.set(i, F.chopExpr(result.get(i), Config.DEFAULT_ROOTS_CHOP_DELTA));
            }
        }
        result = QuarticSolver.sortASTArguments(result);
        return result;
    } catch (JASConversionException e2) {
        LOGGER.debug("RootsFunctions.rootsOfQuadraticExprPolynomial() failed", e2);
    }
    return result;
}