MATLAB Variables
Variables contain statically-typed data.
Declaration
Variables are declared using the equals sign (=). To suppress printing of the value assigned, complete the declaration with a semicolon (;).
>> m=3*5
m =
15
>> m=3*5;Variable names must start with a letter and must contain only letters, numbers, and underscores (_). Variable names are case-sensitive.
If an interactive command tries to declare a variable with an invalid name, the prompt is re-filled where the name is replaced with a suggested 'fix'.
Arrays and Matrices
All data are arrays. To declare a variable with more than 1 element, try:
r=[3 5]
This is a row vector. To instead declare a column vector, try:
c=[3; 5]
To declare a matrix, mix the two syntaxes:
M=[1 2; 3 4]
To concatenate arrays horizontally, try:
A=[c M]
To concatenate arrays vertically, try:
B=[r; M]
Workspace
Variables exist in a workspace. To clear the workspace, try clear.
To save all variables in the workspace to a file named like foo.mat, try save foo. To save a subset of variables instead, try save foo VARLIST.
To load a workspace from a file, try load foo. To load a subset of variables contained in that file, try load foo VARLIST.