More MATLAB Commands...On this page we present the use of some very basic MATLAB commands and functions. With Matlab, you can perform simple operations, as if you were working with a calculator.
Common Functions
Matlab doesn't care about spaces between operands, and multiplications are performed before additions. Type these operations on the command window (only the part just after '>>', and Matlab will give the answers): >> 2 + 1 + 3 ans = 6 >> 8*9 - 6*5 + 3*4 ans = 54 >> x=2 x = 2 >> y=3 y = 3 >> cos(x)+sqrt(y)+tan(x+y) ans = -2.0646 >> You can keep values in variables: >> apples=2 apples = 2 >> bananas=5 bananas = 5 >> peaches=4 peaches = 4 >> fruit=apples+bananas+peaches fruit = 11 Ending the instruction with a ';' sign tells Matlab to make the operation but not to display the answer. To see a list of your variables in memory you can use the commands 'who' or 'whos'. >> whos
Grand total is 5 elements using 40 bytes Variables are sensitive to lower/upper case. They have to start with a letter and can contain also numbers and underscores.
To delete variables you can use the 'clear' command. Operations with Complex Numbers >> c1 = 1 - 2i c1 = 1.0000 - 2.0000i >> c2 = 6 - 9j c2 = 6.0000 - 9.0000i >> c3 = sqrt(-2) c3 = 0 + 1.4142i >> c4 = c1 + c2 - c3 c4 = 7.0000 -12.4142i >> M-files Matlab allows you to place your commands on a simple text file. You should name this file with the '.m' extension. Giving Matlab the name of this file while in the command window, makes Matlab to execute the script. For example, name a text file 'primer.m'. Make it contain the following text: a = 3; b = -4; c = 8; d = a*b-c When you execute this from the command window >> primer you obtain this information from MATLAB: d = -20 M-File functions
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