Mathematical Notation Converter

Equation Converter 0.3.1

Converts equations from standard mathematical notation, to JavaScript notation.

Capabilities

  • Supports use of the caret sign ("^") to indicate power. For example, x^2 = x**2
  • Handles implied multiplication. For example, 2x = 2*x, 3(4) = 3*(4)
    • Right-parenthesis followed by left-parenthesis, number*, variable, function, or constant
    • Number followed by left-parenthesis, variable, function, or constant
    • Variable followed by left-parenthesis, number*, variable, function, or constant
    • Constant followed by left-parenthesis, number*, variable, function, or constant
  • Removes white space. For example 2 + 5x = 2+5x

* Asterisks indicates non-standard formations in mathematics such as (5+2)8 instead of 8(5+2). These are (by choice) interpreted as multiplication.

Version history

Version 0.3.1 (26 Sep 2019)
Switched to Standard Javascript style for internal code. More explicit handling of math functions, which now allows use of exponential notation (9e9 to mean 9*10^9). Added a series of code tests that can be run using the command runTests() from the browser console to prevent regressions.
Version 0.3 (24 Sep 2019)
Switched to using x**y for powers instead of pow(x,y). This simplified code and resolved several edge cases that were not processed correctly (such as (2+x)^3). The power operator has pretty broad browser support now. Also added a with(Math){} statement to the final JavaScript notation, so that Math functions (like sin() and cos()) and constants (like PI and E) work out of the box.
Version 0.2.4 (Aug 2009)
Replaced used of const with var since only Mozilla recognizes it. Replaced eval with better code.
Version 0.2.3 (Feb 2008)
Added support for negative sign following caret. For example, x^-2 = pow(x,-2). Note that negative sign preceding caret is not supported (by choice), i.e. -x^2 = -(x^2) instead of (-x)^2. This is in keeping with behavior of most handheld graphing calculators.
Version 0.2.2
Bug fix regarding mishandling of constants and numbers preceding caret.
Version 0.2.1 (Apr 2007)
Bug fixes: added implied multiplication for constant followed by number, stopped reserved constants LOG2E and LOG10E from becoming LOG2*E and LOG10*E, fixed mishandling of constants and functions preceding caret.
Version 0.2 (Apr 2007)
Added support for use of caret sign ("^") as power operator.
Version 0.1 (Apr 2007)
Added support for implied multiplication and removes white space.

Reference