bar plot with different color bars depending on height

Question

Giannis Nikolopoulos 2021-6-1

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/845030-bar-plot-with-different-color-bars-depending-on-height

评论： Vartika Agarwal 2021-11-19

采纳的回答： Mathieu NOE

在 MATLAB Online 中打开

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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Answer 1

Mathieu NOE 2021-6-1

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https://ww2.mathworks.cn/matlabcentral/answers/845030-bar-plot-with-different-color-bars-depending-on-height#answer_714515

在 MATLAB Online 中打开

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;