Fill plot with gradient colors

Question

Sergio Yanez-Pagans 2021-10-31

1
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https://ww2.mathworks.cn/matlabcentral/answers/1576113-fill-plot-with-gradient-colors

移动：Adam Danz 2023-8-20

I'm trying to plot a signal, for example cos(x), with a red gradient colormap for positive values and a blue one for negative values. Something similar to the solution previously discussed in:

https://www.mathworks.com/matlabcentral/answers/847360-filling-inside-of-a-plot-with-color-gradient

I haven't been able to make this work for me, any suggestions?

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Star Strider 2021-11-1

I posted this Comment responding to a similar Comment in the referenced post.

Sergio Yanez-Pagans 2021-11-1

Thanks Strider!

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Answer 1

Dave B 2021-10-31

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https://ww2.mathworks.cn/matlabcentral/answers/1576113-fill-plot-with-gradient-colors#answer_821068

编辑：Dave B 2021-10-31

Here's one way to make the patch with the color gradient:

x=linspace(0,4*pi,100);

y=cos(x);

patch([x flip(x)],[y zeros(size(y))],[y zeros(size(y))])

You could use jet or turbo to have blue on the bottom and red on the top:

figure

patch([x flip(x)],[y zeros(size(y))],[y zeros(size(y))])

colormap jet

Or you could mix hot and cool colormaps:

figure

patch([x flip(x)],[y zeros(size(y))],[y zeros(size(y))])

colormap([cool;hot])

Or you could make your own colormap, just plug in red green and blue values that suit you (first column is red, second column is green, third column is blue):

figure

patch([x flip(x)],[y zeros(size(y))],[y zeros(size(y))])

cmap = ones(256,3);

cmap(129:256,2)=linspace(0,1,128);

cmap(129:256,3)=linspace(0,1,128);

cmap(1:128,1)=linspace(1,0,128);

cmap(1:128,2)=linspace(1,0,128);

colormap(cmap);