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[Bug-gne] Specific question
From: |
Diana Khashimova |
Subject: |
[Bug-gne] Specific question |
Date: |
Thu, 28 Jun 2007 15:11:19 -0000 |
User-agent: |
Internet Messaging Program (IMP) H3 (4.1.4) |
Dear members of Bug-gne -- GNUPedia technical discussions list,
I have a question related to fitting the equation to experimental
data. The fitting equation looks like y=a*exp(-(b*ln(c/x)/e)**(d)).
Only three parameters have to be fitted, these are a, e, d.
Experimental data are y and x.The coefficients b and c are known.
After writing mentioned above function into script file, the program
says that 'ln' is undefined function. I used logarithmic and normal
scale for x axis, but the message was the same. Why it is so?
How should I describe such a function? I could not find the answer in
http://t16web.lanl.gov/Kawano/gnuplot/index-e.html
Please help me to solve my problem.
Diana
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