Plot 2D data colormap

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Dusaucy Camille 2021-3-26

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https://ww2.mathworks.cn/matlabcentral/answers/784211-plot-2d-data-colormap

评论： Nathan Hardenberg 2023-7-20

Hello,

I have a file with 3 columns: x,y and z and I would like to plot a 2D map with the value of data z at the coordinate (x,y) with a colorbar that is in the range of the z-data (z is not a function of x and y). My points are from an unscructured grid point. I already try to use scatter and pcolor but I did not succeed to do this.

Could you help me to do this ? Thank you in advance !!

Camille From Belgium

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darova 2021-3-26

Better be to place your comment in the answer section

Bobby Fischer 2021-3-27

Okay.

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采纳的回答

Bobby Fischer 2021-3-27

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/784211-plot-2d-data-colormap#answer_659771

在 MATLAB Online 中打开

This could help:

x = -3 + 6*rand(50,1);
y = -3 + 6*rand(50,1);
v = sin(x).^4 .* cos(y);
F = scatteredInterpolant(x,y,v);
[xq,yq] = meshgrid(-3:0.1:3);
F.Method = 'linear';
vq1 = F(xq,yq);
figure(1), close(1), figure(1)
plot3(x,y,v,'mo')
hold on
mesh(xq,yq,vq1)
title('Nearest Neighbor')
legend('Sample Points','Interpolated Surface','Location','NorthWest')
view(2)
colormap default
colorbar