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## Surface fitting

**From**: |
jlapin |

**Subject**: |
Surface fitting |

**Date**: |
Sun, 22 Feb 2015 12:14:13 -0800 (PST) |

Hello Everyone
I am currently working in a Pchem lab and am trying to model spectroscopy
data. I have a 256 x 433 unit matrix of signal data. Each signal is a
function of a wavelength value and a time value. So far I have used the
functions "nonlin_curvefit" and "leasqr" to fit the data one row(or column)
at a time. Now I would like to fit the entire surface to an equation that is
a function of both time and wavelength.
The inputs of the function leasqr are leasqr(*x,y,pin,f*). Y will be the
256x433 signal data, pin will be my initial parameter guesses and f will be
my function handle. The problem I am having is the x vector(s) for
independent values. This is a function of both the wavelength and time
variables.
What can I put in for the x argument so that the leasqr function fits the
entire matrix?
Thank you
Joel
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**Surface fitting**,
*jlapin* **<=**