# Gnuplot - Histogram Fitting **URL:** \ **Category:** UNIX for Dummies Questions & Answers\ **Created:** [October 26, 2010, 9:15pm UTC](https://community.unix.com/t/gnuplot-histogram-fitting/276179 "2010-10-26T21:15:28Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![goffinj](https://community.unix.com/letter_avatar/goffinj/32/5_5575768a8748004e209b776fc1b2916d.png) [@goffinj](https://community.unix.com/u/goffinj)\ **Post date:** [October 26, 2010, 9:15pm UTC](https://community.unix.com/t/gnuplot-histogram-fitting/276179/1 "2010-10-26T21:15:28Z")
Hi I am trying to fit my histogram data with a gaussian model and am encountering two problems: 1. I can't seem to fit the histogram data with a model fit y(x) 'bin.txt' using 2:xtic(1) via a,b,c (error: need 2 to 7 using specs) 2. Even when I manually guess the correct parameters for my fit and try to plot both the curve and histogram at the same time, only the histogram shows up My data is: #Bin Frequency 86 0 90 1 94 4 98 4 102 7 106 6 110 5 114 9 118 4 122 5 126 3 130 1 134 0 138 1 y(x)=a\*exp(-((x-b)/c)\*\*2) a=9.0; b=110.0; c=7.07 plot y(x), 'bin.txt' using 2:xtic(1) (only the histogram is displayed) Any advice would be helpful, thanks. ---
**Author:** ![rdcwayx](https://community.unix.com/letter_avatar/rdcwayx/32/5_5575768a8748004e209b776fc1b2916d.png) [@rdcwayx](https://community.unix.com/u/rdcwayx)\ **Post date:** [October 26, 2010, 10:41pm UTC](https://community.unix.com/t/gnuplot-histogram-fitting/276179/2 "2010-10-26T22:41:09Z")
ok, I think you have provided the sample input file, could you please provide the sample output from your input file?