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From: Karl Ratzsch <mail.kfr@gmx.net>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: chart disappears when i add xrange / yrange to binary array plot of radio spectrogram data
Date: Wed, 2 Mar 2016 00:33:36 +0100
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Am 01.03.2016 um 14:58 schrieb Mario Cannistrà:
> They are created as a sequence of float values and I'm
> successfully reading them as array=8000x79   (for this test)
> where 8000 are the frequency bins and 79 are the scans made and
> recorded. Real files will reach at least 100 MB size and this is
> why they are in binary format and not in csv. For the same reason
> I'm storing only z values and NO x,y (timestamps, frequencies).
> 

Gnuplot cannot magically deduce the time & frequency from the range
settings. You need to calculate them from the indices $1 and $2 of
your matrix via a "using" statement:

  plot datafile binary matrix=... using (t($1)):(f($2)):3 with image