3D Plotting in matlab
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I have got a function after integration in Matlab, f($\theta$,$g$) which is a complex function. I would like to get 3D plot the this function with respect to $\theta$ and g, where $g$ positive integer runs from 0 and $\theta $ runs from 0 to $\pi$. The function is very large and complicated one. Pl hep me to plot this.
2 Comments
Walter Roberson
on 23 Jan 2020
It is disappointing that you deleted the further discussion and contributions from the volunteers :(
Accepted Answer
Star Strider
on 18 Jan 2020
I assume ‘complex’ just means complicated, and not a function with real an imaginary arguments or output. If it is actually complex in the mathematical sense, a slightly different procedure than that presented here would be necessary.
Try something like this:
theta = linspace(0, pi, 50);
g = linspace(0, 100, 50);
[Th,G] = ndgrid(theta, g);
F = f(Th,G);
figure
mesh(Th, G, F)
grid on
Make appropriate changes to get the result you want.
4 Comments
Walter Roberson
on 19 Jan 2020
What result are you expecting for theta = 0 leading to division by sin(0)?
Walter Roberson
on 19 Jan 2020
%% Now I need to perform that integration of phi and make a 3d plot of that result with
theta and alpha , aplha is a real integer runs from 0 to ...and theta from 0 to pi.
The integration of phi? But phi is one of your input variables, not an output formula.
Which of your formulas is to be integrated with respect to what? What should be a long the two independent axes? As you indicate that alpha is an integer, it sounds as if alpha is not one of your independent variables.
Your r is complex valued. Are you looking to plot the real or the imaginary part or are you looking to plot the absolute value?
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