How to add fixed Colorbar based on a vector for 2D scatter plot with 3 vectors

Question

Yaser Khojah 2018-10-23

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/425677-how-to-add-fixed-colorbar-based-on-a-vector-for-2d-scatter-plot-with-3-vectors

评论： Jon Hinwood 2020-10-15

I want to compare two [2D scatter] plots that both have three variables (x,y,z). I'm plotting x against y and showing vector z for both plots by color. I need to make the colorbar fixed so I can compare the two plots. How can I make this colorbar range fixed for both? Thank you in advance

if true
figure 
pointsize = 10;
scatter(x1, y1, pointsize, z1)
colorbar;
figure 
pointsize = 10;
scatter(x2, y2, pointsize, z2)
colorbar;
end

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Jon Hinwood 2020-10-15

I have tried using caxis, which I use with the plot command, but it has no effect and the range is set automatically to the full range of my data. I have tried placing the caxis command before, after the specification of colormap and before and after the call to scatter and in all 4 positions. Also tried rebooting computer and repeating the trials.

I did find that caxis only worked with plot if the caxis command was after the colormap and before the plot command. I an using Matlab R2019b Academic with Windows 10 both fully updated. Help please!

Jon. 15 Oct 2020

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Star Strider 2018-10-23

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/425677-how-to-add-fixed-colorbar-based-on-a-vector-for-2d-scatter-plot-with-3-vectors#answer_342986

在 MATLAB Online 中打开

One option is to normalize the ‘z’ values by scaling them with respect to the range of both ‘z1’ and ‘z2’:

figure 
pointsize = 10;
scatter(x1, y1, pointsize, (z1-min([z1(:);z2(:)]))/max([z1(:);z2(:)]))
colorbar;
figure 
pointsize = 10;
scatter(x2, y2, pointsize, (z2-min([z1(:);z2(:)]))/max([z1(:);z2(:)]))
colorbar;

The colorbar will be the same for both.

4 个评论
显示 2更早的评论隐藏 2更早的评论

Yaser Khojah 2018-10-23

Thanks a lot for your help. It worked finally. I just need to find a better way know to see these colors since I have problem with seeing color haha but thanks a lot.