Implied multiplication

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The tutorial consists of more than 200 live examples from 50 sections. Each of the examples can be copied and run on your own environment. In addition, mXparser provides an extensive collection of over 500 built-in math functions, expressions and symbols. Familiarize yourself with the scope and the syntax. Live testing is the best way to learn. Good luck! 🙂

Tutorial Math Collection API spec Download

Below is the code for JAVA, the code for C# is almost identical. To copy the code, double-click inside the frame.

Case 1: Numbers and parenthesis

// JAVA: import org.mariuszgromada.math.mxparser.*;
// C#: using org.mariuszgromada.math.mxparser;
// ...
Expression e = new Expression("2(3+4)3");
mXparser.consolePrintln(e.getExpressionString() + " = " + e.getCanonicalExpressionString());
mXparser.consolePrintln("Res: " + e.getExpressionString() + " = " + e.calculate());

[mXparser-v.5.2.1] 2(3+4)3 = 2*(3+4)*3
[mXparser-v.5.2.1] Res: 2(3+4)3 = 42.0

Case 2: Numbers and constants / arguments

// JAVA: import org.mariuszgromada.math.mxparser.*;
// C#: using org.mariuszgromada.math.mxparser;
// ...
Expression e = new Expression("2pi+3e");
mXparser.consolePrintln(e.getExpressionString() + " = " + e.getCanonicalExpressionString());
mXparser.consolePrintln("Res: " + e.getExpressionString() + " = " + e.calculate());

[mXparser-v.5.2.1] 2pi+3e = 2*pi+3*e
[mXparser-v.5.2.1] Res: 2pi+3e = 14.438030792556722

Case 3: Numbers and constants / arguments and parenthesis

// JAVA: import org.mariuszgromada.math.mxparser.*;
// C#: using org.mariuszgromada.math.mxparser;
// ...
Expression e = new Expression("2pi(3+4)2e");
mXparser.consolePrintln(e.getExpressionString() + " = " + e.getCanonicalExpressionString());
mXparser.consolePrintln("Res: " + e.getExpressionString() + " = " + e.calculate());

[mXparser-v.5.2.1] 2pi(3+4)2e = 2*pi*(3+4)*2*e
[mXparser-v.5.2.1] Res: 2pi(3+4)2e = 239.11255823485985

Case 4: Numbers and constants / arguments and parenthesis and functions

// JAVA: import org.mariuszgromada.math.mxparser.*;
// C#: using org.mariuszgromada.math.mxparser;
// ...
Expression e = new Expression("2pi(3+4)2sin(3)e");
mXparser.consolePrintln(e.getExpressionString() + " = " + e.getCanonicalExpressionString());
mXparser.consolePrintln("Res: " + e.getExpressionString() + " = " + e.calculate());

[mXparser-v.5.2.1] 2pi(3+4)2sin(3)e = 2*pi*(3+4)*2*sin(3)*e
[mXparser-v.5.2.1] Res: 2pi(3+4)2sin(3)e = 33.74356614531889

Case 5: Implied multiplication and possible ambiguity

// JAVA: import org.mariuszgromada.math.mxparser.*;
// C#: using org.mariuszgromada.math.mxparser;
// ...
Expression e = new Expression("2pi2");
e.checkSyntax();
mXparser.consolePrintln(e.getExpressionString() + " = " + e.getCanonicalExpressionString());
mXparser.consolePrintln(e.getErrorMessage());

[mXparser-v.5.2.1] 2pi2 = 2*pi2
[mXparser-v.5.2.1] [2pi2]: Starting syntax check...
[2pi2]: Token 'pi2', index 3: Invalid token.
[2pi2]: Errors have been found.

Case 6: Implied multiplication and list of tokens

// JAVA: import org.mariuszgromada.math.mxparser.*;
// C#: using org.mariuszgromada.math.mxparser;
// ...
Expression e = new Expression("2pi(3+4)2e");
e.consolePrintCopyOfInitialTokens();

[mXparser-v.5.2.1]  --------------------
[mXparser-v.5.2.1] | Expression tokens: |
[mXparser-v.5.2.1]  ---------------------------------------------------------------------------------------------------------------
[mXparser-v.5.2.1] |    TokenIdx |       Token |        KeyW |     TokenId | TokenTypeId |  TokenLevel |  TokenValue |   LooksLike |
[mXparser-v.5.2.1]  ---------------------------------------------------------------------------------------------------------------
[mXparser-v.5.2.1] |           0 |           2 |             |           1 |           0 |           0 |         2.0 |             |
[mXparser-v.5.2.1] |           1 |           * |             |           3 |           1 |           0 |         NaN |             |
[mXparser-v.5.2.1] |           2 |          pi |             |           1 |           9 |           0 |         NaN |             |
[mXparser-v.5.2.1] |           3 |           * |             |           3 |           1 |           0 |         NaN |             |
[mXparser-v.5.2.1] |           4 |           ( |           ( |           1 |          20 |           1 |         NaN |             |
[mXparser-v.5.2.1] |           5 |           3 |       _num_ |           1 |           0 |           1 |         3.0 |             |
[mXparser-v.5.2.1] |           6 |           + |           + |           1 |           1 |           1 |         NaN |             |
[mXparser-v.5.2.1] |           7 |           4 |       _num_ |           1 |           0 |           1 |         4.0 |             |
[mXparser-v.5.2.1] |           8 |           ) |           ) |           2 |          20 |           1 |         NaN |             |
[mXparser-v.5.2.1] |           9 |           * |             |           3 |           1 |           0 |         NaN |             |
[mXparser-v.5.2.1] |          10 |           2 |             |           1 |           0 |           0 |         2.0 |             |
[mXparser-v.5.2.1] |          11 |           * |             |           3 |           1 |           0 |         NaN |             |
[mXparser-v.5.2.1] |          12 |           e |             |           2 |           9 |           0 |         NaN |             |
[mXparser-v.5.2.1]  ---------------------------------------------------------------------------------------------------------------

Case 7: Enable / disable implied multiplication

// JAVA: import org.mariuszgromada.math.mxparser.*;
// C#: using org.mariuszgromada.math.mxparser;
// ...
Expression e = new Expression("2pi+3e");
e.disableImpliedMultiplicationMode();
e.checkSyntax();
mXparser.consolePrintln("Disable: \n" + e.getErrorMessage());
e.enableImpliedMultiplicationMode();
e.checkSyntax();
mXparser.consolePrintln("Enable: \n" + e.getErrorMessage());

[mXparser-v.5.2.1] Disable: 
[2pi+3e]: Starting syntax check...
[2pi+3e]: Token '2pi', index 1: Invalid token. Possibly missing multiplication operator - try implied multiplication mode.
[2pi+3e]: Token '3e', index 3: Invalid token. Possibly missing multiplication operator - try implied multiplication mode.
[2pi+3e]: Errors have been found.
[mXparser-v.5.2.1] Enable: 
[2pi+3e]: Starting syntax check...
[2pi+3e]: No errors detected.