Simple 2D graph plotter made in python
How to plot graphs:
Enter the equation of the line without the 'y =' or 'r ='
Equation must be in post-fix notation (see below) with spaces in between every operator/operand
Multiple lines can be drawn, use a semicolon(;) to seperate the equations of the lines
Variable must be 'x' for y=f(x) lines or 'theta' for r=g(θ) lines. No other letters will work
Press 's' to save an image of the graph!
New - press 'r' to shade the region under the graph
Post-fix Notation:
Post-fix notation, also known as Reverse Polish Notation (RPN) is simply a way of writing maths without the need for brackets. It is used as computers can evaluate results more easily in a stack without having to know the rules of BIDMAS.
In RPN the operator comes after the operand as opposed to inbetween, which is how we usually see it in in-fix.
For example:
(a+bx)/d in RPN would be 'a b x * + d /'
The operators which the program currently supports are:
'+ - * / ^ ! sqrt sin cos tan arcsin arccos arctan cosec sec cot log ln |'
Important note:
Modulus graphs '|' only require one modulus sign after the equation - only 1 is required.
Logs are entered in the format: 'x n log' - this is equivelant to lognx
Natural logs are in the format: 'x ln' - this is equivelant to ln x
Feel free to make pull requests and get graphing!
Screenshot of graphs:
Licensed under the MIT License.