https://github.com/connerdouglass/grapher-swift
iOS graphing calculator app and math expression parsing framework.
https://github.com/connerdouglass/grapher-swift
Last synced: 2 months ago
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iOS graphing calculator app and math expression parsing framework.
- Host: GitHub
- URL: https://github.com/connerdouglass/grapher-swift
- Owner: connerdouglass
- Created: 2014-09-29T04:43:15.000Z (over 10 years ago)
- Default Branch: master
- Last Pushed: 2020-04-19T22:12:31.000Z (about 5 years ago)
- Last Synced: 2025-03-18T01:51:29.247Z (3 months ago)
- Language: Swift
- Size: 45.9 KB
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
# What is grapher-swift
Grapher-Swift (originally called GraphX when I created it) is a framework for parsing strings of mathematical expressions and converting them to functions that can be evaluated. I wrote it when I was a junior in high school, so your mileage may vary. It properly handles the order of operations and, parentheses, and some built-in functions (sqrt, sin, cos, etc.)
# Example: Creating a Function
```swift
// Define a string for the math expression
var expression: String = "x^3+3x^2-4"
// Create a function from the expression
var function: GXFunction = GXFunction(expression: expression)
// Get the value of the function at some input x
var value: Float = function.getValueAtX(10.0)
// Output some values of the function
println("f(0) => \(function.getValueAtX(0.0))")
println("f(2) => \(function.getValueAtX(2.0))")
println("f(4) => \(function.getValueAtX(4.0))")
println("f(6) => \(function.getValueAtX(6.0))")
```