Examples with ExprEvaluator org.matheclipse.core.eval.ExprEvaluator used on opensource projects

Example 6 with ExprEvaluator

use of org.matheclipse.core.eval.ExprEvaluator in project symja_android_library by axkr.

the class CalculusExample method main.

public static void main(String[] args) {
    try {
        // don't distinguish between lower- and uppercase identifiers
        Config.PARSER_USE_LOWERCASE_SYMBOLS = true;
        ExprEvaluator util = new ExprEvaluator(false, 100);
        // Show an expression in the Java form:
        // Note: single character identifiers are case sensistive
        // (the "D()" function input must be written as upper case
        // character)
        String javaForm = util.toJavaForm("D(sin(x)*cos(x),x)");
        // prints: D(Times(Sin(x),Cos(x)),x)
        System.out.println(javaForm.toString());
        // Use the Java form to create an expression with F.* static
        // methods:
        IAST function = D(Times(Sin(x), Cos(x)), x);
        IExpr result = util.evaluate(function);
        // print: Cos(x)^2-Sin(x)^2
        System.out.println(result.toString());
        // Note "diff" is an alias for the "D" function
        result = util.evaluate("diff(sin(x)*cos(x),x)");
        // print: Cos(x)^2-Sin(x)^2
        System.out.println(result.toString());
        // evaluate the last result ($ans contains "last answer")
        result = util.evaluate("$ans+cos(x)^2");
        // print: 2*Cos(x)^2-Sin(x)^2
        System.out.println(result.toString());
        // evaluate an Integrate[] expression
        result = util.evaluate("integrate(sin(x)^5,x)");
        // print: 2/3*Cos(x)^3-1/5*Cos(x)^5-Cos(x)
        System.out.println(result.toString());
        // set the value of a variable "a" to 10
        // Note: in server mode the variable name must have a preceding '$'
        // character
        result = util.evaluate("a=10");
        // print: 10
        System.out.println(result.toString());
        // do a calculation with variable "a"
        result = util.evaluate("a*3+b");
        // print: 30+b
        System.out.println(result.toString());
        // Do a calculation in "numeric mode" with the N() function
        // Note: single character identifiers are case sensistive
        // (the "N()" function input must be written as upper case
        // character)
        result = util.evaluate("N(sinh(5))");
        // print: 74.20321057778875
        System.out.println(result.toString());
        // define a function with a recursive factorial function definition.
        // Note: fac(0) is the stop condition.
        result = util.evaluate("fac(x_IntegerQ):=x*fac(x-1);fac(0)=1");
        // now calculate factorial of 10:
        result = util.evaluate("fac(10)");
        // print: 3628800
        System.out.println(result.toString());
    } catch (SyntaxError e) {
        // catch Symja parser errors here
        System.out.println(e.getMessage());
    } catch (MathException me) {
        // catch Symja math errors here
        System.out.println(me.getMessage());
    } catch (final Exception ex) {
        System.out.println(ex.getMessage());
    } catch (final StackOverflowError soe) {
        System.out.println(soe.getMessage());
    } catch (final OutOfMemoryError oome) {
        System.out.println(oome.getMessage());
    }
}