convert plot3 to contour plot

Question

MOOSE 2020-1-17

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/500722-convert-plot3-to-contour-plot

回答： Star Strider 2020-1-17

Hi,

I have a novice question in matlab.

Say that I have some matrix

a = [1 2 3; 4 5 6; 7 8 10; 11 12 13]

I can plot this in 3d where column 1 is the x-axis, column 2 is the y-axis, and column 3 is the z-axis, by writing

plot3(a(:,1),a(:,2),a(:,3),'.').

However, I also want to make a contour plot where I have column 1 along the x-axis, column 2 along the y-axis, and column 3 represents the heights above the z = 0 plane. To do this I have to reshape my data somehow so that I can write something like

contourf(X,Y,Z).

How can I do this efficiently?

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Answer 1

Star Strider 2020-1-17

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/500722-convert-plot3-to-contour-plot#answer_410598

在 MATLAB Online 中打开

Use the griddata function:

a = randi(9, 10, 3);
x = a(:,1);
y = a(:,2);
z = a(:,3);
xv = linspace(min(x), max(x),  6);
yv = linspace(min(y), max(y),  8);
[X,Y] = meshgrid(xv, yv);
Z = griddata(x,y,z,X,Y);
figure
contourf(X, Y, Z)
colorbar