How can I create a surface plot (with height in Z) from X-Y coordinates and Z as a matrix?

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A LL
A LL 2021-8-12
评论： A LL 2021-8-12
I try to plot a surface plot (with height in Z) from X-Y coordinates and Z as a matrix.
X and Y are my coordinates from 1 to 100 and Z is a matrix containing the values I want to plot as a surface.
Here, my Z matrix is called mymatrix.
I tried to use the commands pcolor and surf but instead of getting a surface with surf I still get the same plot as the one generated with pcolor.
I have attached the figures I get as well as mymatrix.
Here is what I tried:
%% pcolor command
figure(1)
clf;
hold on;
pcolor(mymatrix);
cb = colorbar;
xlim([1 100]);
ylim([1 100]);
title(['pcolor command'],'FontSize', 24, 'FontWeight', 'Bold');
%% surf command
[X,Y] = meshgrid(1:100,1:100);
figure(2)
clf;
hold on;
grid on;
grid minor;
xlim([1 100]);
ylim([1 100]);
surf(X,Y,mymatrix);
cb = colorbar;
title(['surf command'],'FontSize', 24, 'FontWeight', 'Bold');
Does anyone know how to produce a surface plot with height and colours as the third dimension of my plot?
Thank you

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采纳的回答

Cris LaPierre
Cris LaPierre 2021-8-12
Ran in:
Remove the clf and hold on commands from your plotting commands.
The coloring is already done by height, but by default, each panel is a solid color, with the color being determined by the Z value on the left/bottom edge. Change your FaceColor property to 'interp' to apply a gradient.
load mymatrix.mat
figure(2)
grid on
grid minor
surf(1:100,1:100,mymatrix,'LineStyle',"none","FaceColor","interp")
cb = colorbar;
title(['surf command'],'FontSize', 24, 'FontWeight', 'Bold')
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Cris LaPierre
Cris LaPierre 2021-8-12
Not easily. Grid lines are drawn on the box containing the axes. You'd have to manually add the lines to your surface using secondary plot commands.

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更多回答（1 个）

KSSV
KSSV 2021-8-12
load('mymatrix.mat') ;
surf(mymatrix) ;
shading interp
colorbar
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