Comments on: Defining a palette with discrete colors

By: John L. Males

John L. Males — Fri, 11 Mar 2022 08:16:38 +0000

I have been searching for some time with no success to find out how to set what I like to set when trying to create gnuplot graph that is basically only needs two colours. I am using the set palette and the graph works as I like, but I do not want the colour bar that shows to right of right margin. I have not been able to find a way for this colour bar gradient not to show. I have read the set palette command syntax many times as well as lot of searching to find out the answer to this question I do not have to use set palette if there is an alternate method to accomplish one colour for negative and one colour for positive.

By: lgs

lgs — Mon, 11 Jun 2018 17:26:07 +0000

I’ve been trying to get a discrete colorbar like the one in this tutorial but without having to specify the colors for the segments explicitly. This is because I’m sampling the colors from a palette, and I want to take advantage of the palettes’ correct coloration for each stepwise change in dataset. I’m using the lc palette method with the third column of data describing the part of the colorbar to draw from as is described elsewhere on this site. My dataset is being shown as I wanted it, with colors picked evenly along the length of the palette in accordance with how many datasets there are. However the color bar remains continuous though I’ve added a maxcolors statement below where I load the palette. I suppose I need to use the ‘set palette defined’ statement too, but I haven’t figured out how to retain my automatic sampling from the palette while also having this statement in my script. Also as I said above it would be a huge win for me not to have to re-figure out what the rgb values of each subset of data are if I have to change them in a later iteration of this figure. Any advice would be appreciated.

By: hagen

hagen — Tue, 23 Jun 2015 19:02:28 +0000

Hi kipgon,

what exactly happens if you try to replot Fig. 1?

By: kipgon

kipgon — Mon, 15 Jun 2015 16:58:33 +0000

hi,

first I would like to thank you for your very interesting and helpful website.

I also would like to ask you a question because after a lot of test, I didn’t manage to use maxcolors with a defined palette.

Do you know how to fix this issue ?

Thanks in advance

By: hagen

hagen — Tue, 22 Jan 2013 17:47:54 +0000

Thanks, that is a much nicer method.
I have updated the post to include maxcolors.

By: hemmer

hemmer — Tue, 22 Jan 2013 16:42:58 +0000

A much simpler way to do this is to use:

set palette maxcolors N

where N is the number of levels to use.

By: Arturo

Arturo — Wed, 04 Jul 2012 18:59:39 +0000

I’ve found it:

set cbtics font “Helvetica,8” #smaller font
set format cb “%2.0f” #format
set cbtics offset -2 #change location

By: Arturo

Arturo — Wed, 04 Jul 2012 17:31:32 +0000

How can I plot the colorbox marks labels (2, 4, ….) *inside* the colorbox?
Thanks again for your website!!!