Thanks a lot. I could fix the problem. But I have another problem. I got an error message "zero division occurs" in the err_test function. Actual err function is a more complicated one and there is a formula of the form "1/parameter1". So I use the "leastsq" whith I can set the constraint on parameters values. I set a lower bound 0.00001 for parameter1. But still I have a same error message. Is there some way I can stop the run and look at where zero division occurs when error occurs? I don't know whether scilab has a debug mode.
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