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Program-generated names and commands

This shows how to generate variable names 'on the fly'.
% A1, A2, A3, and A4 are created and set to 3
for i=1:4
s=sprintf('A%d= 3',i);

% This shows how to run a command that's stored in a string
str=input('Type in a command ','s') 

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Information provided by Tim Love