4 - Creating Variables

This is class #04 of Interactive Beginners Guide to MATLAB. In this video I will tell you how you can create variables in MATLAB.

You can create new variables in the workspace by running MATLAB code or using existing variables.

To create a new variable, enter the variable name in the Command Window, followed by an equal sign (=) and the value you want to assign to the variable. For example, if you run these statements, MATLAB adds the three variables x, A, and I to the workspace:

x = 5.71;

A = [1 2 3; 4 5 6; 7 8 9];

I = besseli(x,A);

You do not have to declare variables before assigning values to them.

If you do not end the assignment statement with a semicolon (;), MATLAB displays the result in the Command Window. For example,

x = 5.71

x =

     5.7100

If you do not explicitly assign the output of a statement to a variable, MATLAB generally assigns the result to the reserved word ans. The value of ans changes with every statement that returns an output value that is not assigned to a variable. For example,

sin(1)

ans =
      0.8415
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