bar plot with different color bars depending on height

2021 6 1
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更新时间：2021 11 19
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Hello to all,
I have two matrices, lets say the below:
x = [1:10]
y= [13, 25, 34, 65, 78, 92, 54, 46, 39, 5]
I need a bar plot (x,y) where each bar has a different color depending on its height (y value). Colors should be from blue (low values) to red (high values). I also need to create the respective colorbar with an asceding step of 10
How can I create this bar plot?
Thanks in advance

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Mathieu NOE
Mathieu NOE 2021-6-1

0 个投票

hello Giannis
see code below and ouput here :
clc
clearvars
x = [1:10];
y= [13, 25, 34, 65, 78, 92, 54, 46, 39, 5];
%% main code
map = colormap('jet');
[mmap,nmap] = size(map);
data_min = min(y);
data_max = max(y);
f= figure(1), hold on
for k = 1:length(y)
h=bar(x(k),y(k));
% now define col value based on data value (min data value maps to colormap map index 1
% and max data value maps to colormap map last index);
ind = fix(1+(mmap-1)*(y(k)-data_min)/(data_max-data_min));
set(h, 'FaceColor', map(ind,:)) ;
% Display the values as labels at the tips of the bars.
xtips1 = h.XEndPoints;
ytips1 = h.YEndPoints + 3;
labels1 = string(h.YData);
text(xtips1,ytips1,labels1,'HorizontalAlignment','center')
end
xlabel('X axis')
ylabel('Y axis')
hold off
CBAR_ticks = 10*(fix(min(y)/10):ceil(max(y)/10));
caxis([min(CBAR_ticks),max(CBAR_ticks)])
hcb=colorbar('Ticks',CBAR_ticks,'TickLabels',split(num2str(CBAR_ticks)));
hcb.Title.String = "Y range";
hcb.Title.FontSize = 13;

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Hello!! thank you for your answer. I wanted exactly that!! However when I run your code to my matlab (2019a) there is an error. It says:
"Unrecognized method, property, or field 'XEndPoints' for class 'matlab.graphics.chart.primitive.Bar'.
Error in test (line 18)
xtips1 = h.XEndPoints; "
There is something wrong with the XEndPoints... do you know what is going on?
Thank you
Giannis
Giannis Nikolopoulos
编辑：Giannis Nikolopoulos 2021-6-1
ok I commented these lines and now it runs ok!!
I didnt understand the formula of 'ind' !! where you based to use this function?is it a common methodology?
By thw way, I understand that you are trying to find the respective row of the color from the map matrix based on the y value...
Mathieu NOE
Mathieu NOE 2021-6-2
hello
I don't have the error (I run R2020b)
the ind formula is to actually set the color according to the colormap scale and the bar height.
Vartika Agarwal
Vartika Agarwal 2021-11-19
I want to plot a 10 bars in bar graph with different colors
y=[20 10 5 3 12 18 25 20 30 40];
bar(y)
Can you help me for acheiving this

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