# Graph an equation!

Please note that this question is different from this question. This one asks for graphical output, while the other one asks for ascii art.

# Objective

Help! Timmy's graphing calculator broke! His calculator cannot graph anymore. However, he has found a way to add new programs and functions to his calculator. Your job is to write a program/function that graphs equations.

# Rules

• Your program/function should take in a string in the form of "y = random equation involving x" and graph it on the coordinate grid.
• Timmy's calculator doesn't have that much memory, so please try to make your code as short as possible.
• The operations needed are addition (+), subtraction (-), multiplication (*), division (/), exponentiation(^) and grouping(())
• Your program/function should be able to graph from x=-5 to x=5, and from y=-5 to y=5.
• Color, axis labels, the grid, numbers, scale, and animation are optional.
• The minimum size of the image should be 50x50 pixels.

# Test Cases

### Input

y = x ^ 2

### Input

y = 4 * x + 3

### Output

Standard loopholes apply.

You may change the operators, but it adds +10% to your byte count.

• What is the minimum size of the image to be output? – Nathan Merrill Mar 20 '16 at 13:13
• 50x50 pixels minimum. – clamchowder314 Mar 20 '16 at 13:22
• Desmos, 0 bytes? It has been defined as a programming language. – Arcturus Mar 20 '16 at 13:50
• What does this mean: "Your program/function should be able to graph from x=-5 to x=5, and from y=-5 to y=5"? What should the boundaries be if y = 0.01*x? And what about y = 1000*x? Snould all boundaries be [-5, 5][-5, 5] regardless of what the function is? – Stewie Griffin Mar 20 '16 at 13:55
• I think you should ban plotting builtins. Those will lead to answers with just one function call. – Denker Mar 20 '16 at 14:12

# Matlab, 35 bytes

ezplot(input(''));axis([-5 5 -5 5])


Input is a string like 'y=2*x^2'.

• Maybe you should clarify that the string needs to include the quotation marks – Luis Mendo Mar 21 '16 at 21:56

# Mathematica, 89 77 bytes

Plot[ToExpression[#~StringDrop~4],{x,-5,5},PlotRange->{-5,5},AspectRatio->1]&


Most of it is just formatting to make it look similar to the examples. Please inform me if something isn't required. Includes axis markers, which aren't explicitly disallowed.

• The question says you do not need the axis markers. But if it reduces the byte count you can probably use them. – NoOneIsHere Mar 20 '16 at 14:54

# RPL/2 15*1.1 = 16.5

STEQ .5 *S DRAW


Timmy must key in the equation in capitals, e.g.'Y = X ^ 3', hence the 10% penalty.

The .5 is just luck: the default box is -10…10 × -10…10 with RPL/2.

# MATL, 40 * 1.1 = 44

K0h)5:p'(-5:.1:5)'XHYXUHUw2\$XG-5,5hth1ZG


This works in current version (15.0.0) of the language. EDIT (June 15, 2017): You can try it at MATL Online!

.*, ./ and .^ are for multiplication, division and power (that is, add a dot in front).

The following shows an example result running on Matlab.