one of the input parameters of a function in an mfile is undefined but works

Hi All

I am running an mfile that sums a function , which in it , one of the outputs is not defined , and it should be assigned to a parameter , when I edit that mfile and make matlab to print that parameter while doing the for loop , I see it is defined somehow , but I seached through and it is not defined no where in the files , and after the running is finished , matlab doesnt know this parameter anymore

[Geoff Hayes]

Farzad - you will need to provide your code (use the paperclip button to attach the m file) and indicate which parameter in question is causing the problem. Fully describe the steps you take to run this m file (is it a script or a function?) and include all relevant inputs.