How to plot sin(theta)*cos(phi) in spherical coordinates

Question

Nathan Cross 2018-2-21

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https://ww2.mathworks.cn/matlabcentral/answers/383855-how-to-plot-sin-theta-cos-phi-in-spherical-coordinates

回答： Unai San Miguel 2018-2-21

 [theta,phi] = meshgrid(linspace(-pi,pi,41),linspace(-pi/2,pi/2,41));
R = sin(theta)*cos(phi);
[X,Y,Z] = sph2cart(theta,phi,R);
surf(X,Y,Z)
alpha 0.5
axis vis3d

Tried using the code above but it is not giving me what I would expect (a p orbital looking shape). Any way anyone could help me figure this out?

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Answer 1

Amjad Green 2018-2-21

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https://ww2.mathworks.cn/matlabcentral/answers/383855-how-to-plot-sin-theta-cos-phi-in-spherical-coordinates#answer_306187

plot3(X,Y,Z)

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Nathan Cross 2018-2-21

在 MATLAB Online 中打开

 [theta,phi] = meshgrid(linspace(-pi,pi,41),linspace(-pi/2,pi/2,41));
R = sin(theta)*cos(phi);
[X,Y,Z] = sph2cart(theta,phi,R);
plot3(X,Y,Z)

Tried this and it seems like I am still having an issue because I am getting this for the graph

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Answer 2

Unai San Miguel 2018-2-21

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https://ww2.mathworks.cn/matlabcentral/answers/383855-how-to-plot-sin-theta-cos-phi-in-spherical-coordinates#answer_306278

sin(theta) * cos(phi) is the result of the matrix multiplication of the two terms. Maybe you wanted sin(theta) .* cos(phi)? The latter has in every element of the array the product of sin(theta(i,j)) and cos(phi(i,j))