How can I add a print the first bar with a color, second with color different and the last with a different color in subplot ?

I have this program

x1=[1;2;3]
y1 = [91,25,3];
y2 = [71,22,13];
y3 = [81,22,33];
y4 = [71,12,63];
y5 = [61,42,23];
y6 = [51,21,23];


figure;

subplot(3,2,1);
b1=bar(x1,y1);
ylabel('Cost per Byte (%)');
ylim([0 max(y1)+10]);
title('Aaa');



subplot(3,2,2);
b2=bar(x1,y2);
ylabel('Security (%)');
ylim([0 max(y2)+10]);

title('Second plot');


subplot(3,2,3);
b3=bar(x1,y3);
ylabel('Data rate (kbps)');
ylim([0 max(y3)+10]);
title('Third plot');


subplot(3,2,4);
b4=bar(x1,y4);
ylabel('Delay (ms)');
ylim([0 max(y4)+10]);

title('Fourth plot');


subplot(3,2,5);
b5=bar(x1,y5);
ylabel('Jitter (ms)');
ylim([0 max(y5)+10]);
title('Fifth plot');
subplot(3,2,6);


b6=bar(x1,y6);
ylabel('Loss ratio 10^6 (ms)');
ylim([0 max(y6)+10]);
title('Sixth plot');


legend('peaks');
set(b1,'FaceColor','red');

I want colorate all the first bars by a color and add a legend like the picture :

Please help me.

Answer 1

[Star Strider]

The only way that I am aware of to plot the individual bar colours is to use a loop:

x1 = [1;2;3]

x1 = 3×1

1 2 3

y1 = [91,25,3];

cm = [1 0 0; 1 1 0; 0 1 1];

figure
hold on
for k = 1:numel(x1)
    b1(k) = bar(x1(k),y1(k), 'FaceColor',cm(k,:));
end
hold off

and so for the rest. It would be worthwhile to make a function out of this if you are going to use it repeatedly, for example:

x1 = [1;2;3];
y1 = [91,25,3];
y2 = [71,22,13];
y3 = [81,22,33];
y4 = [71,12,63];
y5 = [61,42,23];
y6 = [51,21,23];


figure;

subplot(3,2,1);
b1=barfcn(x1,y1);
ylabel('Cost per Byte (%)');
ylim([0 max(y1)+10]);
title('Aaa');



subplot(3,2,2);
b2=barfcn(x1,y2);
ylabel('Security (%)');
ylim([0 max(y2)+10]);

title('Second plot');


subplot(3,2,3);
b3=barfcn(x1,y3);
ylabel('Data rate (kbps)');
ylim([0 max(y3)+10]);
title('Third plot');


subplot(3,2,4);
b4=barfcn(x1,y4);
ylabel('Delay (ms)');
ylim([0 max(y4)+10]);

title('Fourth plot');


subplot(3,2,5);
b5=barfcn(x1,y5);
ylabel('Jitter (ms)');
ylim([0 max(y5)+10]);
title('Fifth plot');
subplot(3,2,6);


b6=barfcn(x1,y6);
ylabel('Loss ratio 10^6 (ms)');
ylim([0 max(y6)+10]);
title('Sixth plot');


legend('peaks');
set(b1,'FaceColor','red');

function bh = barfcn(x,y)
    cm = [1 0 0; 1 1 0; 0 1 1];
    hold on
    for k = 1:numel(x)
        bh(k) = bar(x(k),y(k));
        bh(k).FaceColor = cm(k,:);
    end
    xlim([min(x)-0.5 max(x)+0.5])
    hold off
end

Experiment to get the result you want.

[Rahim Rahim]

thank you it work, how can I change the colors ?

[Star Strider]

My pleasure!

Change the ‘cm’ matrix to whatever you want. The colours are defined by its rows, not columns, so experiment with those to get the colours you want. The the documentation on colormap for a choice of several different options, and specific colours.

For example,

cm = turbo(3);

would be one option.

[Rahim Rahim]

@Star Strider It is done.

Can you help me please ? https://www.mathworks.com/matlabcentral/answers/811000-how-can-i-add-a-legend-in-the-end-of-sublot-on-the-bottom-of-sublot?s_tid=prof_contriblnk