Custom colormaps and color bars

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Becca
Becca 2013-6-14
Running MATLAB R2013a
I am using a custom colormap created with the colormap command on a plot. When I add a legend, the legend is in the correct color order. However, when I add a colorbar, it uses the 'jet' colormap. How do I get it to use my custom colormap? I included the relevant code below:
%setting the line color order where varycolor is from matlab central
numpowers = 50; %(usually ~20-100)
clrmap = colormap(varycolor(numpowers)); %sets line color order
figure('OuterPosition',[100 100 1000 640],'name',strcat('RLplot',devname),'numbertitle','off');
axes('FontSize',20,'FontName','Times New Roman','ColorOrder',clrmap);
grid on;
hold all;
box on;
for i = 1:length(structkey)
%each structure element in the structure contains a dataset
%a new color is assigned for each structure element
%each structure element corresponds to a number, say 1:1:50
eval(['RL = RLdata.' char(structkey(i)) ';']);
L=RL(:,1); %#ok<NODEF>
R=RL(:,2);
% Least squared linear fit to data
x=0:3:24;
fitcoeff = polyfit(L,R,1);
fiteqn = polyval(fitcoeff,x);
%Plot data
plot(L,R,'x',x,fiteqn,'-','Color',clrmap(i,:),'LineWidth',1.5);
%Write the string that will become the legend --> how I did the legend
% tmplgd = char(structkey(i));
% tmplgd = str2double(tmplgd(2:end-2))/1000;
% legendstr(2*i-1,1) = cellstr(sprintf('%0.3f %s', tmplgd, '\muW/\mum^3')); %#ok<AGROW>
% legendstr(2*i,1) = cellstr(sprintf('%s %0.1f %s %0.1f', 'y =', ...
% fitcoeff(1,1), 'x +', fitcoeff(1,2))); %#ok<AGROW>
end

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采纳的回答

Kelly Kearney
Kelly Kearney 2013-6-14
When trying to match colors of lines for objects plotted one at a time in a loop, I usually find it easier to manually set line colors, rather than trying to rely on the color order of the axis. For the record, your example does this; even though you set a color order you never actually use it, since you override the defaults with your specific colors. Keep in mind that the colormap (of a figure) and color order (of an axis) are two different things, and need to be set separately.
cmap = jet(5);
figure;
hold on;
for ii = 1:5
y = rand(10,1);
h(ii,1) = plot(1:10, y, 'color', cmap(ii,:));
h(ii,2) = plot(1:10, y+0.1, 'color', cmap(ii,:), 'linestyle', '--');
end
legend(h(:,1), {'one', 'two', 'three','four','five'});
colormap(cmap);
colorbar;
  1 个评论
Becca
Becca 2013-6-14
I changed my cmap array so that I do not need to call it in the plot command. This did not fix it. However, when I moved the colormap(cmap) command from before the plot (and axes call) to just befor the colorbar as in your example, it worked.
Thank you

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更多回答（1 个）

Andrew Newell
Andrew Newell 2013-6-14
编辑：Andrew Newell 2013-6-14
With the command
clrmap = colormap(...)
you only define the variable clrmap, not set the colormap. Here is a simple example of how you could make colormap work:
clrmap = colormap(lines); %sets line color order
colormap(clrmap);
figure
axes('ColorOrder',clrmap);
hold all;
for i = 1:5
plot(0:1,[0 i])
end
colorbar
Note that, having defined the color order, you don't need to refer to it explicitly in the plot.
  3 个评论
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Andrew Newell
Andrew Newell 2013-6-14
Did my example work without change? It should have both the lines and the colorbar using colormap lines, which has rapid changes in color. You could try substituting your colormap. Explicitly including the color in the plot commands is a side issue.
Becca
Becca 2013-6-14
Your example did work, but I could not get it to apply directly. I did get it to work in my program by moving the "colormap(clrmap);" command to just before the "colorbar" command.
Thank you

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