Plotting is a very important step in the study of a system, since it helps understand the behavior and the restrictions of system with the less effort possible.

Plotting an equation is not always an easy task especially if you have to work out all the parameters manually, luckily nowadays there are tons of tools that help plot equations.

Matlab is the most popular tools out there when it comes to the study of system, and in this post we are going to work with some basic equations, Matlab, and most importantly make use of EZPLOT for plotting equations.

## Plotting equations in Matlab using EZPLOT

### Ezplot Matlab example

To plot this equation in Matlab using the EZPLOT, We will write the equation the following way

Now type the following code and press ENTER

ezplot('y-x^3-x^2+x-1',[-5 5 -5 5])

And you will obtain the following figure

If you would like to have more information about the command we just used, you can find it by using the following code

doc ezplot

While using the EZPLOT, the structure of the code is the following

ezplot(fun,[xmin,xmax,ymin,ymax])

Where *fun* is the equation, *xmin* and *xmax* are respectively the lower and the highest value of x, *ymin* and *ymax* the lowest and highest value of y. If the most interesting part of the graph your are plotting is happening in a larger interval than the one we just plotted, you may need to increase the value of xmin, xmax, ymin and ymax.