Resetting arrays

Is there any way a vector/matrix that is initialized in an iterative program be reset, so that MATLAB doesn't recognize it in the next iteration even after it has been evaluated in a previous iteration, so that it could be resized depending upon the value of a parameter evaluated at runtime during every iteration.

Answer 1

[Walter Roberson]

Ummm, like

clear VariableName

Answer 2

[Amarpal]

Thanks a lot. New to MATLAB :)