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bsattin
Canada
Posts |
 Posted - 01/26/2004 : 10:55:47 AM
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Hi,
I would like to fit some data to a function, and add a couple limits.
for example, if f(x)<0, then f(x)=0.
Is this possible in Origin?
thank you for your help,
Bernie
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easwar
USA
1965 Posts |
Posted - 01/26/2004 : 12:00:15 PM
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Hi Bernie,
Sure, you can do this. Use NLSF - the advanced fitting tool. You can refer to the help files on how to create your own custom fitting function.
For example, to fit a straight line, where you want this condition, you would define your function as
y=a+b*x;
if(y<0){y=0};
The above two-line definition should work either in Origin C mode (versions 7.0 and higher) or in Y-Script mode (for versions below 7.0)
Easwar
OriginLab.
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HELP: setting limits in curve fitting