Re: [Gnuplot-info] Plot matrix data using cut-off values

[Jefferson S. E. P. <st...@gm...>]

(x < A ? B : C)  means: if x<A is true then return B, otherwise, return C.

You only have to understand how -1 and 2 are plotted "with image".

Cheers,
Stafusa


On Thu, Nov 27, 2014 at 2:35 PM, George Patargias <gp...@bi...>
wrote:

> Hello Ethan,
>
> Thanks for this; it seems to work!
>
> So, the expression
>             ($3 < val ? -1 : 2)
>
> means "if the number in column $3 is less than val then assign it to black
> and if not assign to white"? I am not sure I understand the part after the
> question mark (ternary operator)
>
> Thanks again.
>
> George
>
>
> > Out-of-range z values are assigned the limiting colors in the palette,
> so I would try
> >  set cbrange [0:1]
> >  plot "rmsdist4gnu_scale_1_30000.dat" using 1:2:($3 < val ? -1 : 2) with
> > image
> > (but I haven't actually tested that, so maybe I'm missing something) On
> Thu, Nov 20, 2014 at 6:47 AM, George Patargias <gp...@bi...> wrote:
> >> Hello,
> >> I want to plot a 3-column data file using a black-white color scale. I
> was wondering what is the syntax that allows those values of the 3rd
> column to be colored black if they are smaller than a cut-off value and
> white if they are larger than the same cut-off value
> >> The three relevant lines from my script are
> >> set cbrange [0.0:1.0]
> >> set palette defined (0.0 "black", 1.0 "white")
> >> plot "rmsdist4gnu_scale_1_30000.dat" using 1:2:3 with image
> >> I know that is the last line that needs a different syntax but I am not
> sure what.
> >> Many thanks in advance.
> >> Dr. George Patargias
> >> Postdoctoral Research Fellow
> >> Biomedical Research Foundation
> >> Academy of Athens
> >> 4, Soranou Ephessiou
> >> 115 27
> >> Athens
> >> Greece
> >> Office: +302106597568
> >>
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> Dr. George Patargias
> Postdoctoral Research Fellow
> Biomedical Research Foundation
> Academy of Athens
> 4, Soranou Ephessiou
> 115 27
> Athens
> Greece
>
> Office: +302106597568
>
>
>
>
>
>
>
>
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