Examples with FrobeniusSolver org.matheclipse.core.frobenius.FrobeniusSolver used on opensource projects

Example 1 with FrobeniusSolver

use of org.matheclipse.core.frobenius.FrobeniusSolver in project symja_android_library by axkr.

the class FrobeniusSolve method evaluate.

/** {@inheritDoc} */
@Override
public IExpr evaluate(final IAST ast, EvalEngine engine) {
    Validate.checkRange(ast, 3, 4);
    if (ast.arg1().isList()) {
        IAST list = ast.getAST(1);
        try {
            IInteger[][] equations = new IInteger[1][list.size()];
            // format looks like: { { 12, 16, 20, 27, 123 } };
            for (int i = 1; i < list.size(); i++) {
                equations[0][i - 1] = (IInteger) list.get(i);
            }
            equations[0][list.size() - 1] = (IInteger) ast.arg2();
            // all solutions
            int numberOfSolutions = -1;
            if (ast.size() == 4) {
                numberOfSolutions = ((ISignedNumber) ast.arg3()).toInt();
            }
            FrobeniusSolver solver = new FrobeniusSolver(equations);
            IInteger[] solution;
            IAST result = F.List();
            if (numberOfSolutions < 0) {
                while ((solution = solver.take()) != null) {
                    result.append(Lists.asList(solution));
                }
            } else {
                while ((solution = solver.take()) != null) {
                    if (--numberOfSolutions < 0) {
                        break;
                    }
                    result.append(Lists.asList(solution));
                }
            }
            return result;
        } catch (RuntimeException e) {
            if (Config.SHOW_STACKTRACE) {
                e.printStackTrace();
            }
        }
    }
    return null;
}