20 Nov
2007
20 Nov
'07
11:09 p.m.
Hi, I am having problems with the least squares fitting. This may or may not be a bug. I am trying to get an idea of the errors from fitting data. I am usualy fitting to Gaussian Lorentzian, Lor**2 etc. When I try to compute the errors from sigma = sqrt(diag(cov_x)) where cov_x is the covariance matrix I get results which are wildly different than anything before. Including some code I had a long time ago in Matlab. Does anyone have any idea if the form of cov_x is correct or any success in using this? Thanks, Stuart