Examples with DoubleEvaluator org.matheclipse.parser.client.eval.DoubleEvaluator used on opensource projects

Example 16 with DoubleEvaluator

use of org.matheclipse.parser.client.eval.DoubleEvaluator in project symja_android_library by axkr.

the class EvalDoubleCallbackTestCase method testEval006.

public void testEval006() {
    try {
        DoubleEvaluator engine = new DoubleEvaluator();
        BooleanVariable vb = new BooleanVariable(true);
        engine.defineVariable("$1", vb);
        BooleanVariable vb2 = new BooleanVariable(true);
        engine.defineVariable("$2", vb2);
        double d = engine.evaluate("If[$1 && $2, 1, 0]");
        Assert.assertEquals(d, 1d, DoubleEvaluator.EPSILON);
        vb.setValue(false);
        d = engine.evaluate();
        Assert.assertEquals(d, 0d, DoubleEvaluator.EPSILON);
    } catch (Exception e) {
        e.printStackTrace();
        Assert.assertEquals("", e.getMessage());
    }
}

Example 17 with DoubleEvaluator

use of org.matheclipse.parser.client.eval.DoubleEvaluator in project symja_android_library by axkr.

the class EvalDoubleCallbackTestCase method testEval003.

public void testEval003() {
    try {
        DoubleEvaluator engine = new DoubleEvaluator();
        double d = engine.evaluate("Sin[Pi/2*Cos[Pi]]");
        assertEquals(Double.toString(d), "-1.0");
    } catch (Exception e) {
        e.printStackTrace();
        assertEquals("", e.getMessage());
    }
}

Example 18 with DoubleEvaluator

use of org.matheclipse.parser.client.eval.DoubleEvaluator in project symja_android_library by axkr.

the class EvalDoubleCallbackTestCase method testEval007.

public void testEval007() {
    try {
        DoubleEvaluator engine = new DoubleEvaluator();
        // IDoubleValue vdi = new DoubleVariable(1.0);
        // engine.defineVariable("$i", vdi);
        IDoubleValue vd = new DoubleVariable(3.0);
        engine.defineVariable("$1", vd);
        IDoubleValue vd2 = new DoubleVariable(-4.0);
        engine.defineVariable("$2", vd2);
        double d = engine.evaluate("$i = $1+$2; If[$i>0, 1, -1]");
        Assert.assertEquals(d, -1d, DoubleEvaluator.EPSILON);
        vd2.setValue(4.0);
        d = engine.evaluate();
        Assert.assertEquals(d, 1d, DoubleEvaluator.EPSILON);
    } catch (Exception e) {
        e.printStackTrace();
        Assert.assertEquals("", e.getMessage());
    }
}

Example 19 with DoubleEvaluator

use of org.matheclipse.parser.client.eval.DoubleEvaluator in project symja_android_library by axkr.

the class Console method interpreter.

/**
 * Evaluates the given string-expression and returns the result in string form.
 *
 * @param strEval
 * @return the result in string for
 */
public String interpreter(final String strEval) {
    try {
        DoubleEvaluator engine = new DoubleEvaluator(true);
        double d = engine.evaluate(strEval);
        return Double.toString(d);
    } catch (MathException e) {
        System.err.println();
        System.err.println(e.getMessage());
    } catch (RuntimeException e) {
        e.printStackTrace();
    }
    return "";
}