Determine if a value has changed after some operations?

Hi all,

How can I determine if a value has changed or not after some operations? For example:

testA = valueA; 
% after some operations, testA = valueA or valueB;
% if value of testA changes, continue operation, elseif unchanges, cease operation.

Answer 1

[Guillaume]

testA = valueA;
oldtestA = testA;
%... do some operations that may change testA
if oldtestA ~= testA   %assuming that testA is scalar
    %value has changed
else
    %value has not changed
end