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Creating Surface Plot from a Matrix with 3 Columns

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Sarah
Sarah 2018-7-30
评论： MOHAMED GHAZI 2022-4-3
How do you create a surface plot using a matrix with 3 columns in Matlab? The first column would be the x-values, the second column would be the y-values, and the third column would be the z-values for the surface plot.
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Sarah
Sarah 2018-7-30
I am generating data from a loop. Here is a simple example from the loop:
0.5000 0.5000 66.9052
0.5000 1.0000 57.3591
1.0000 0.5000 76.7805
1.0000 1.0000 66.9052

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KSSV
KSSV 2018-7-30
A = [0.5000 0.5000 66.9052
0.5000 1.0000 57.3591
1.0000 0.5000 76.7805
1.0000 1.0000 66.9052] ;
x = A(:,1) ; y = A(:,2) ; z = A(:,3) ;
%%structured
xi = unique(x) ; yi = unique(y) ;
[X,Y] = meshgrid(xi,yi) ;
Z = reshape(z,size(X)) ;
figure
surf(X,Y,Z)
%%unstructured
dt = delaunayTriangulation(x,y) ;
tri = dt.ConnectivityList ;
figure
trisurf(tri,x,y,z)
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MOHAMED GHAZI
MOHAMED GHAZI 2022-4-3
KSSV how can I trisurf this matrix I used your email program it does not work.
P1=[1;0;1];
P2= [2; 3;2];
P3= [-3;1;2];
P4= [6;2;3];
MatrixP=[1 2 -3 6 ;0 3 1 2;1 2 2 3];
%%structured
[X,Y] = meshgrid(MatrixP) ;
B = unique(A,'rows');
figure
surf(X,Y,Z)
%%unstructured
dt = delaunayTriangulation(x,y) ;
tri = dt.ConnectivityList ;
figure
trisurf(tri,x,y,z)

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更多回答（1 个）

KSSV
KSSV 2021-10-9
x = speed ; y = Torque ; z = bsfc ;
%%structured
xi = unique(x) ; yi = unique(y) ;
[X,Y] = meshgrid(xi,yi) ;
Z = reshape(z,size(X)) ;
figure
pcolor(X,Y,Z)
%% griddata
xi = linspace(min(x),max(x));
yi = linspace(min(y),max(y)) ;
[X,Y] = meshgrid(xi,yi) ;
Z = griddata(x,y,z,X,Y)
pcolor(X,Y,Z)

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