benjamin-cates / xprtcalc

Advanced calculator webapp with programming like features

XprtCalc

Note: project is currently hosted at benjamin-cates.github.io.

XprtCalc (pronounced expert calc) is an string based calculator for advanced experssions. It supports: vectors, lambda functions, arbitrary-precision, and every common math function. XprtCalc parses text to a tree-like object, which can then be computed, derived, simplified, or manipulated in many other ways.

Value types:

• Number (complex float with unit, e.g. 4+2i*[kg])
• Complex arbitrary-precision float (with unit)
• Vectors (many functions like add and sqrt apply to vectors)
• Lambda functions
• Strings (similar to JS)
• Key-value maps (similar to JS)

Features:

• Wide array of built-in functions
  • All elementary math functions
  • Trig functions
  • Integer functions like factor and round
  • Factorial and gamma
  • Comparison
  • Bitwise integer operations
  • Random numbers
  • Arbitrary precision and regular constants
  • Repeated sum and infinite sum
  • Derivative and simplify
  • Numerical integration
  • Vector mapping functions (most array methods in JS)
  • String evaluation
• Includeable library functions
  • Statistics functions
  • Quadratic formula
  • Complex formulas
• Metric units (including multiplication and division interaction)
• Variable declarations and indexed assignment
• History

In addition to utility features, it also has quality of life features:

• Syntax highlighting
• Virtual on-screen keyboard
• Help pages

XprtCalc is currently in beta development. It is mainly written in C++ as a command line program, but is also compiled to WebAssembly and can be accessed at the link above in a web app.

Example usage:

This is an example of a user finding the area to the left of a z-score, given a certain data set. They used the included functions mean, z, and stddev to calculate the area under the z curve to the left of 9.2 to be 0.189 for that data set.

Contributions

The most helpful contribution you can make is to fill out the user experience feedback form. This will help a lot because I can understand what parts are easy to use and what parts are not.

This project is under the MIT License, and the compiling guide will assist you in setting up the project if you would like to edit the command line version.