using a viridis colormap
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Hello everyone,
I would like to know how is it possible to use properly a viridis colormap in order to draw scatter figures. For instance, i have this figure to plot :
figure(2)
plot(x1,y1,'^r','MarkerSize',8,'MarkerFaceColor','r')
% plot(x1,y1,'^r','MarkerSize',8,'MarkerFaceColor',viridis(5))
xlabel('F_{vis}')
ylabel('F_{flambement}','FontSize',13)
But I don't know how to use this "alternative" colormap since I am not familiar with this function in this case.
Could someone help please ?
Thank you in advance.
Sincerely.
采纳的回答
Image Analyst
2022-2-21
1 个投票
See attached demos where I show you how you can replace the default color order of plots and markers with some custom colormap of your own creation.
1 个评论
Nidia Maldonado Carmona
2022-3-28
Thanks a lot for this! This has been really helpful!
更多回答（2 个）
Use scatter() instead of plot(). The behavior of viridis() is otherwise the same as the built-in functions like jet().
N = 20;
x1 = randn(N,1);
y1 = randn(N,1);
scatter(x1,y1,50,viridis(N),'filled','^')
5 个评论
Wissem
2022-2-21
"What's wrong with that ?"
The SCATTER documentation shows that if the 1st and 2nd arguments are X and Y values then the 3rd argument must be the marker size (which you did not provide). The 4th argument is the marker color (not 3rd like you tried).
Also VIRIDIS is not inbuilt. Did you download VIRIDIS from here:
https://www.mathworks.com/matlabcentral/fileexchange/62729-matplotlib-perceptually-uniform-colormaps
and unzip the ZIP file onto your MATLAB path, before trying to use it?
DGM
2022-2-21
As Stephen says, you're missing the marker size specification in the call to scatter().
Wissem
2022-2-21
Stephen23
2022-2-21
@Wissem-Eddine KHATLA: you can also place it into the current directory, which may be easier.
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