CODEWITHSUNDEEP
matlabplot
McMa
McMa

Reputation: 1566

Different ColorMaps for plotyy() values

I have a bar plot with 2 Y-axes generated with plotyy() and want to assign a colormap to each of them. I tired to use colormap(axis,map) but it seems to overwrite the settings of the whole plot, instead of the ones from axis only.

My aproach:

[haxes,hbar1,hbar2]=plotyy(1:2,randi(2000,2,3),3:5,randi(100,3,3),'bar','bar');

set(haxes(1), 'xtickLabel', name(1:2));
set(haxes(2), 'xtickLabel', name(3:5) );
set(haxes,{'ycolor'},{'r';[67,186,52]./256});

%set(hbar1, 'facecolor', ['r','w','y']); %<- Things like this work, but are not what Iwant
colormap(haxes(1),hot)
colormap(haxes(2),summer)

results in this plot

Resulting plot

and I want something like this (which I generated by hand, coloring single bars)

Desired object

How can I apply two different colormaps in a single figure?

Upvotes: 1

Views: 697

Answers (3)

user664303
user664303

Reputation: 2063

Concatenate all the colormaps you want to use into a single colormap, then set each barseries object to index directly into the relevant bin of this colormap. E.g.

[haxes,hbar1,hbar2]=plotyy(1:2,randi(2000,2,3),3:5,randi(100,3,3),'bar','bar');
colormap(haxes(1),[hot(3); summer(3)])
for a = 1:3
    set(get(hbar1(a), 'Children'), 'CData', [a; a], 'CDataMapping', 'direct');
    set(get(hbar2(a), 'Children'), 'CData', [a; a; a]+3, 'CDataMapping', 'direct');
end

produces:

enter image description here

Upvotes: 1

user664303
user664303

Reputation: 2063

A colormap applies to the entire figure, and not just an axes, so when you set the colormap the second time you are just overwriting the first colormap. To quote the colormap documentation (with my own emphasis):

colormap(ax,...) uses the figure corresponding to axes ax instead of the current figure.

Upvotes: 0

SamuelNLP
SamuelNLP

Reputation: 4136

This does exacly what you want,

y = [4.2; 4.6; 5];
h = figure;

a = axes('parent', h);

hold(a, 'on')

colors = {'r', 'b', 'g'};

for i = 1:numel(y)
    bar(i, y(i), 'parent', a, 'facecolor', colors{i});
end

enter image description here

Upvotes: 0

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