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

[George P. <gp...@bi...>]

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