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surf plot 3d - matrix multiplication

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Housam
Housam 2020-2-28
回答： Housam 2020-3-2
Hello,
could someone let me know how to get around this problem in the code.
i need to do the following: 1- plot the surf 2- multiply with RS matrix 3- make a new surf
angle1_min=0; angle1_max=pi/2; %all 8 Octant in 3d [0-2*pi]
angle2_min=0; angle2_max=pi/2;
number1=50; number2=2500; number3=51; %xlsread
[angle1, angle2] = ndgrid(linspace(angle1_min,angle1_max,100),linspace(angle2_min,angle2_max,100)) % size 100*100 (for using surf)
x= number1*sin(angle1)*sin(angle2)
y= number2*cos(angle1)
z= number3*sin(angle1)*cos(angle2)
surf(x, y, z) % works fine
mat = [x; y; z] % size mat here 300*100 (depend on angle size)
RS = [1 0 0; 0 1 0; 0 0 1] % size 3*3
new_mat = RS * mat % Matrix Multiplication is required- RS is to be kept
surf(new_mat)
i tried to use a function with for loop that return one point for mat with the size 1*3 then i multiplied it with RS matrix. at the end i plotted all the points using surf but its not what i expected.

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采纳的回答

Housam
Housam 2020-3-2
rotate

更多回答（1 个）

darova
darova 2020-2-28
You forgot about dot here (bit-wise operator)
x= number1*sin(angle1).*sin(angle2);
y= number2*cos(angle1);
z= number3*sin(angle1).*cos(angle2);
You want to rotate data
mat = [x(:); y(:); z(:)]'; % size mat here 1e4x3
RS = [1 0 0; 0 1 0; 0 0 1] % size 3*3
new_mat = RS * mat % Matrix Multiplication is required- RS is to be kept
x1 = reshape( new_mat(1,:),size(x) );
y1 = reshape( new_mat(2,:),size(y) );
z1 = reshape( new_mat(3,:),size(z) );
surf(x1,y1,z1)

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