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Cross product in 2d and 3D

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Dhafer
Dhafer 2012-12-3
Hi
I would like to combine the distance of r and the theta in one image.
Also, I would like to do the same in 3D.
please help in easy way because I am beginner.
[x y] = meshgrid(-10:1:10,-10:1:10,-10:1:10);
r=sqrt(x.^2+y.^2);
theta=(180/pi)*atan(y./x);
figure
surf(x,y,r)
figure
surf(x,y,theta)
Regards
Dhafer

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回答（2 个）

Walter Roberson
Walter Roberson 2012-12-3
[x y] = meshgrid(-10:1:10,-10:1:10,-10:1:10);
r=sqrt(x.^2+y.^2);
theta=(180/pi)*atan(y./x);
surf(x,y,r)
hold on
surf(x,y,theta)
hold off
would put them in the same axes.
If you want them in two different axes, then
[x y] = meshgrid(-10:1:10,-10:1:10,-10:1:10);
r=sqrt(x.^2+y.^2);
theta=(180/pi)*atan(y./x);
subplot(2,1,1)
surf(x,y,r)
subplot(2,1,2)
surf(x,y,theta)
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Walter Roberson
Walter Roberson 2012-12-4
Do you mean like,
[theta, r] = cart2pol(x, y);

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Dhafer
Dhafer 2013-1-9
how can create loop in mat lab in east way?

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