![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/172494/image.png)
Colouring Bars by 'Y' value
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10B
el 13 de En. de 2016
Comentada: Star Strider
el 14 de En. de 2016
Hello Community,
I am trying to plot a bar chart and to colour the bars according to a rule related to the values for the 'Y' axis. So, if the Y value is a minus figure, the bar should be coloured grey, and if positive, should be coloured black. I have tried the following (and several variations):
% Colouring bars
if y <0;
bar(y,'RGB::Grey');
elseif y >= 0;
bar(y,'RGB::Black');
end
but with no luck. Everything else about the plotting that I am doing works fine.
I'm sure this will be simple for the more experienced, so could anyone suggest a fix to help me please?
Thank you,
10B.
0 comentarios
Respuesta aceptada
Mike Garrity
el 13 de En. de 2016
I would suggest the approach I described in this blog post. In this case, it would look something like this:
x = 1:18;
y = randn(1,18);
mask = y > 0;
y1 = y;
y1(mask) = nan;
bar(x,y1,'FaceColor','red')
hold on
y2 = y;
y2(~mask) = nan;
bar(x,y2,'FaceColor','green')
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/172494/image.png)
3 comentarios
Mike Garrity
el 13 de En. de 2016
Yeah, that's on our list, but I'm afraid it's not very close to the top of the list.
Más respuestas (1)
Star Strider
el 13 de En. de 2016
Editada: Star Strider
el 13 de En. de 2016
This seems to work, at least on my test data:
x = 1:10; y = randi([-9 9], 1, 10);
yp = y>0; % Logial Indices: Positive ‘y’ yn = y<0; % Logial Indices: Negative ‘y’ cm = [0.5 0.5 0.5; 0 0 0]; % Colour Matrix
figure(1) bar(x(yn), y(yn), 'FaceColor',cm(1,:)) hold on bar(x(yp), y(yp), 'FaceColor',cm(2,:)) hold off set(gca, 'XTick', x)
![](/matlabcentral/answers/uploaded_files/43348/Colouring%20Bars%20by%20'Y'%20value%20-%202016%2001%2013.png)
2 comentarios
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