Plotting a multi-function surface?

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Jack Smith
Jack Smith 2015-11-9
评论： Star Strider 2015-11-10
I have the following system:
f = ln(1/x) + 3 for when 1<x
f = 3 for when 0<=x<=1
What I want to do is effectively plot this 2D system as a surface in cylindrical coordinates, 'spinning' the line round as to create something resembling a flat-topped cone. Unfortunately, my limited knowledge of of both the surf and mesh functions leave me unsure of how to do this. Any help would greatly appreciated. Thanks.

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Star Strider
Star Strider 2015-11-9
Is this what you want to do? If not, experiment with it. This should get you started.
f = @(x) 3.*((x >= 0) & (x <= 1)) + (log(1./x) + 3).*(x > 1); % Function
x = linspace(0, 5, 25); % Change upper Limit & Vector Length
[Xc,Yc,Zc] = cylinder(f(x), 25); % Create Cylinder With ‘f’ Describing Radius
figure(1)
surf(Xc, Yc, Zc) % Plot Resulting Cylinder
grid on
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Star Strider
Star Strider 2015-11-10
My pleasure!
That was definitely a challenge!

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