JAVA code
Case 1: Setting the verbose mode
import org.mariuszgromada.math.mxparser.*;
...
Function f = new Function("f(x) = x^2");
Expression e = new Expression("f(2)+(2+3)^2", f);
e.setDescription("Example - verbose mode");
e.setVerboseMode();
mXparser.consolePrintln("Res: " + e.getExpressionString() + " = " + e.calculate());
[mXparser-v.2.3.1] [Example - verbose mode][f(2)+(2+3)^2] [Example - verbose mode][f(2)+(2+3)^2] Starting ... [Example - verbose mode][f(2)+(2+3)^2] Parsing (1, 3) ---> ( 2.0 ) ... ---> f 2.0 + ( 2.0 + 3.0 ) ^ 2.0 ... done [Example - verbose mode][f(2)+(2+3)^2] Parsing (0, 1) ---> f 2.0 ... [f(x) ][ x^2] [f(x) ][ x^2] Starting ... [f(x) ][ x^2] x = 2.0 [f(x) ][ x^2] Parsing (0, 2) ---> 2.0 ^ 2.0 ... ---> 4.0 ... done [f(x) ][ x^2] Calculated value: 4.0 [f(x) ][ x^2] Exiting ---> 4.0 + ( 2.0 + 3.0 ) ^ 2.0 ... done [Example - verbose mode][f(2)+(2+3)^2] Parsing (2, 6) ---> ( 2.0 + 3.0 ) ... ---> 4.0 + ( 5.0 ) ^ 2.0 ... done [Example - verbose mode][f(2)+(2+3)^2] Parsing (2, 4) ---> ( 5.0 ) ... ---> 4.0 + 5.0 ^ 2.0 ... done [Example - verbose mode][f(2)+(2+3)^2] Parsing (0, 4) ---> 4.0 + 5.0 ^ 2.0 ... ---> 4.0 + 25.0 ... done [Example - verbose mode][f(2)+(2+3)^2] Parsing (0, 2) ---> 4.0 + 25.0 ... ---> 29.0 ... done [Example - verbose mode][f(2)+(2+3)^2] Calculated value: 29.0 [Example - verbose mode][f(2)+(2+3)^2] Exiting Res: f(2)+(2+3)^2 = 29.0 [mXparser-v.2.3.1]
Case 2: Syntax checking
import org.mariuszgromada.math.mxparser.*;
...
/* Function and expression definition */
Function fib = new Function("fib(n) = if( n>1, fib(n-1)+fib(n-2), if(n > 0, 1, 0) )");
Expression e = new Expression("fib(10) + 20/sin(x)", fib);
/* 1st trial of syntax checking. */
mXparser.consolePrintln("1st trial of syntax checking.");
e.checkSyntax();
mXparser.consolePrintln(e.getErrorMessage());
/* Definition modification */
Argument x = new Argument("x = 2");
e.addDefinitions(x);
/* 2nd trial of syntax checking. */
mXparser.consolePrintln("2nd trial of syntax checking.");
e.checkSyntax();
mXparser.consolePrintln(e.getErrorMessage());
[mXparser-v.2.3.1] 1st trial of syntax checking. [mXparser-v.2.3.1] [fib(10) + 20/sin(x)] checking ... [fib(10) + 20/sin(x)] (fib, 0) checking user defined function ... [fib(10) + 20/sin(x)] -> [fib] = [ if( n>1, fib(n-1)+fib(n-2), if(n > 0, 1, 0) )] checking ... [fib(10) + 20/sin(x)] -> [fib] = [ if( n>1, fib(n-1)+fib(n-2), if(n > 0, 1, 0) )] no errors. [fib(10) + 20/sin(x)] (x, 9) invalid <TOKEN>. [fib(10) + 20/sin(x)] errors were found. [mXparser-v.2.3.1] 2nd trial of syntax checking. [mXparser-v.2.3.1] [fib(10) + 20/sin(x)] checking ... [fib(10) + 20/sin(x)] (fib, 0) checking user defined function ... [fib(10) + 20/sin(x)] -> [fib] = [ if( n>1, fib(n-1)+fib(n-2), if(n > 0, 1, 0) )] already checked - no errors! [fib(10) + 20/sin(x)] no errors. [mXparser-v.2.3.1]
Case 3: Lexical syntax checking
import org.mariuszgromada.math.mxparser.*;
...
Expression e = new Expression("fun(1,2)+3");
mXparser.consolePrintln("checkSyntax = " + e.checkSyntax());
mXparser.consolePrintln(e.getErrorMessage());
mXparser.consolePrintln("checkLexSyntax = " + e.checkLexSyntax());
[mXparser-v.4.0.0] checkSyntax = false [mXparser-v.4.0.0] [fun(1,2)+3] checking ... [fun(1,2)+3] (fun, 0) invalid <TOKEN>. [fun(1,2)+3] errors were found. [mXparser-v.4.0.0] checkLexSyntax = true
Case 4: Getting computing time
import org.mariuszgromada.math.mxparser.*;
...
Expression e = new Expression("sum(i, 1, 1000000, 1)");
mXparser.consolePrintln("Res : " + e.getExpressionString() + " = " + e.calculate());
mXparser.consolePrintln("Computing time = " + e.getComputingTime() + " s.");
Res : sum(i, 1, 1000000, 1) = 1000000.0 Computing time = 0.372 s.
Enjoy! 🙂
Best regards,
Mariusz Gromada
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