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 stretched exponential function

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tini the tiger Posted - 04/12/2006 : 04:02:04 AM
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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