Re: [Gnuplot-info] Write letters instead of numbers on y-axis

[Thomas S. <t.s...@fz...>]

assuming that 'a', 's', and 'z' are the only states, you could read
the y-values in using 'stringcolumn' and test for specific letters:

set yrange [0:4]
set ytics ("a" 1, "s" 2, "z" 3)
plot "datafilename" using
1:(strstrt(stringcolumn(2),"a")?1.0:(strstrt(stringcolumn(2),"s")?2.0:3.0))
with linespoints, "" using
1:(strstrt(stringcolumn(3),"a")?1.0:(strstrt(stringcolumn(3),"s")?2.0:3.0))
with linespoints


Nfjord wrote:
> 
> Dear all,
> 
> I would like to plot data from a file but the data for the y-axis are
> letters. My data file looks like:
> 
> 1 a z
> 2 a a
> 3 z s
> 4 s s
> 5 s a
> 
> Column 1 = time (used for x-axis)
> Column 2 = current state of object 1
> Column 3 = current state of object 2
> 
> I want to plot the state of the objects versus time, i.e. I want that the
> values of the y-axis are "a", "s", and "z".The problem is that the states
> are letters, not numbers. How can I do to plot this kind of data please?
> 

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