Choosing color of bars in bar graph depending on value (not individual, but from colormap)

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MarionJ 2018-6-28

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https://ww2.mathworks.cn/matlabcentral/answers/407816-choosing-color-of-bars-in-bar-graph-depending-on-value-not-individual-but-from-colormap

编辑： MarionJ 2018-6-28

采纳的回答： MarionJ

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Hello

I want to create a 2D- bar graph and Color the bars depending on their values in gray tones. That is what I have so far:

figure()
y = rand(10,1)*3-1.5;
x = linspace(start, end, size(y));
b=bar(x,y,1);
% Defining Colormap
cm=gray(size(y));
colormap(cm);
set(get(b,'children'),'cdata', y);

But this does not work. Neither:

set(get(b,'children'),'CData', y);

I am missing something. Any help?

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Walter Roberson 2018-6-28

Please do not use "end" as a variable name; you will confuse us, you will confuse you, you will confuse MATLAB.

MarionJ 2018-6-28

Sorry. This is actually not my original code. Just edit it for the question. But you are right.

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采纳的回答

MarionJ 2018-6-28

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https://ww2.mathworks.cn/matlabcentral/answers/407816-choosing-color-of-bars-in-bar-graph-depending-on-value-not-individual-but-from-colormap#answer_326654

编辑：MarionJ 2018-6-28

在 MATLAB Online 中打开

Okay. I have found a complicated way of doing it:

figure()
hold on
y= vector;
x = linspace(startpoint, endpoint, size(y,2));
barColorMap= gray(size(y,2));
lscale=linspace(min(y),max(y),size(barColorMap,1));
for cnt=1:size(y,2)
    bg=bar(x(cnt),y(cnt),1);
    [~,ind]=min(abs(lscale(:)-y(cnt)));
    set(bg,'FaceColor',barColorMap(ind,:),'EdgeColor',barColorMap(ind,:));
end