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How to use colormap for different bars.

21 次查看（过去 30 天）
ref
ref 2011-11-10
I am trying to plot a bar chart with error bars, giving different colors to the individual bars using colormap function, but instead I get the same color for all bars. How can i set the bars following one specific colormap?
y = [4.2; 4.6; 5]; %The data.
s = [.3; .2; .6]; %The standard deviation.
h = bar(y);
colormap(hsv(h))
hold on
set(gca, ...
'XTickLabelMode', 'manual', ...
'XTickLabel', {'R0', 'R1', 'R2'})
h1 = errorbar(y,s,'r');
set(h1,'linestyle','none')

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采纳的回答

Jonathan
Jonathan 2011-11-11
See if this helps.
y = [4.2; 4.6; 5]; %The data.
s = [.3; .2; .6]; %The standard deviation.
fHand = figure;
aHand = axes('parent', fHand);
hold(aHand, 'on')
colors = hsv(numel(y));
for i = 1:numel(y)
bar(i, y(i), 'parent', aHand, 'facecolor', colors(i,:));
end
set(gca, 'XTick', 1:numel(y), 'XTickLabel', {'R0', 'R1', 'R2'})
errorbar(y,s,'r');

更多回答（1 个）

ref
ref 2011-11-11
Sorry, I have one more question. When "y" has 3 elements, then the colors I get for the bars are "red, green & blue". When I change the elements of "y" to 4, or 5, Matlab does not give the same colors. Instead it gives "red, light green, light blue and purple". Is it possible to hold constant the colors for the elements? I need the same color for the first-second-third element independently the number of elements of "y".
  2 个评论
Jonathan
Jonathan 2011-11-11
You can try something like this modification.
bar(1, y(1), 'parent', aHand, 'facecolor', 'r');
bar(2, y(2), 'parent', aHand, 'facecolor', 'g');
bar(3, y(3), 'parent', aHand, 'facecolor', 'b');
colors = copper(numel(y) - 3);
for i = 4:numel(y)
bar(i, y(i), 'parent', aHand, 'facecolor', colors(i-3,:));
end

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