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Re: curve-fitting with additional constraints
| Re: curve-fitting with additional constraints [message #1757] |
Tue, 08 February 1994 13:42 |
pln
Messages: 10
Registered: September 1991
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Junior Member |
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Jennifer Dungan (jennifer@gaia.arc.nasa.gov) wrote:
: I have a curve-fitting question.
: I am using second degree polynomials of the form
: y=a2*x^2 + a1*x + a0
: to fit some data. This is a reasonable model and most of the data
: can be fit quite well. However, the model also needs to include
: the constraint that the maximum response is at x=0. I don't have
: any data at exactly x=0. Does anyone know how I can incorporate
: this additional constraint into my fitting program? I am currently
: using IDL's POLY_FIT.
This constraint is equivalent to requiring a1=0 in your model.
You could change to a simpler model
y=a2*x^2 + a0.
--
* Patrick L. Nolan (415)723-0133 *
* W. W. Hansen Experimental Physics Laboratory (HEPL) *
* Stanford University *
* Bitnet: PLN@SLACVM Internet: pln@egret0.stanford.edu *
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