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From: Karl Ratzsch <mail.kfr@gmx.net>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: Histogram using Gnuplot
Date: Tue, 27 Nov 2018 12:04:09 +0100
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Am 27.11.2018 um 10:02 schrieb Savin Beniwal:

> gnuplot> plot"hist1.txt" u (rounded($1)):(1) smooth frequency with boxes

> 1. I want to get a histogram with probability density rather than frequency. Means my histo box should show frequency/total no. of points. 

check "help smooth": You want "fnormal" instead of "frequency"

> 2 How to set/change the width of the histogram.

Do you mean

  set xrange [start:end]

? Also check the link to smooth.dem in "help fnormal"

  Karl