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tini the tiger

Germany
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Posted - 04/12/2006 :  04:02:04 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Hi.

I would like to fit my data with a streched exponential function:

y=P1+P2*exp((-x/P3)^P4)

but I do not achieve to fit P4. It works only if a set P4 as an integer (1, 2,..).

I even do not achieve to simply set my column values with a function like:

2-1*exp((-col(t)/90)^P4)

if P4 is not an integer.

How can I solve this problem. I#m using ORIGIN 7.0

Thanks in advance

tini the tiger
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