Fit problem with multi histograms

luner · September 7, 2006, 3:17am

I have 12 histograms and put them in 12 pads in the same canvas. I fit each of them with a defined function. However, after fitting, the fit parameters from last histogram will overwrite all the previous 11 ones. Could someone give me a suggestion? Thanks a lot.

brun · September 7, 2006, 5:51am

Could you post teh shortest possible RUNNING script reproducing this problem?

Rene

luner · September 7, 2006, 4:07pm

I attach my root file and marco file. Just run this marco in root and get a ps file which saves all the fitted histograms. But last fit parameters overwrite previous ones.
etaplotbsa_MM2.C (3.31 KB)
allhists_MM2.root (1.88 MB)

brun · September 8, 2006, 3:37pm

Could you send #include “/home/zhaobo/top_dir/include/histerror.C”

Rene

luner · September 8, 2006, 6:30pm

sorry, I forgot this file.
histerror.C (2.53 KB)

brun · September 8, 2006, 9:00pm

I cannot reproduce this problem. See resulting ps file

Rene
etafitMM2.ps (167 KB)

luner · September 11, 2006, 3:48pm

In this ps file, the green curve and blue curve are right only for last histogram.
For other 11 histograms, green curve and blue curve are not drawn correctly.
It seems that the parameters from last histogram overwrite all the previous 11 ones so that green curve and blue curve are not drawn correctly.

Thanks a lot