Bar Chart with different colors - Dependent on a additional information

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Sophia Bitterwolf 2020-4-3

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https://ww2.mathworks.cn/matlabcentral/answers/515036-bar-chart-with-different-colors-dependent-on-a-additional-information

评论： Sophia Bitterwolf 2020-4-3

采纳的回答： Ameer Hamza

在 MATLAB Online 中打开

Hello!

I've created this bar chart and now like to colour different values with different colours depending on the type to which they belong.

Every y-value has an additional information from which type the value is,

e.g. first value - type 1,

second value - 2,

third value - 1

fourth - 3

My suggestion was:

figure
hold on
for i = 1:length(l)
h = bar (y)
if l(i) == 1
set (h, 'Facecolor', 'k')
elseif l(i) == 2
set (h, 'Facecolor', 'r');
else 
set (h, 'Facecolor', 'b');
end
end

y is the array with all the y-values and

l is the array containing all the types (already in the right order).

So the two arrays have the same size.

But the result won't be in different colours.

Can anyone help?

Sophia

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Mehmed Saad 2020-4-3

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define x axis for bar

 figure,bar(1:10,100*rand(1,10),'Facecolor','k')
 hold on,bar(11:20,100*rand(1,10),'Facecolor','b')

Sophia Bitterwolf 2020-4-3

The problem is, that it's not that the first 10 values are type 1 (red) and the second 10 are type 2 (blue).

It can also happen that x-values 1-8 are type 1, 9 is type 2, 10-14 are type 3 and 15 is type 1 again.

So the type doesn't go in a ascending order.

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采纳的回答

Ameer Hamza 2020-4-3

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/515036-bar-chart-with-different-colors-dependent-on-a-additional-information#answer_423745

编辑：Ameer Hamza 2020-4-3

在 MATLAB Online 中打开

This show how to make a bar chart with different colors based on a grouping variable. The reason for using a nan entry in the input array of bar function is explained here: https://www.mathworks.com/matlabcentral/answers/360978-fixing-the-absolute-bar-width-on-bar-plot

x = 1:10;
y = rand(1, 10);
grp = [1 2 2 3 3 3 2 1 1 2];
unique_grps = unique(grp);
colors = rand(numel(unique_grps), 3);
ax = axes();
hold(ax);
for i=1:numel(unique_grps)
    mask = grp==unique_grps(i);
    X = x(mask);
    Y = y(mask);
    b = bar([X X(end)+1], [Y nan], 0.7, 'FaceColor', colors(i,:));
end