fsurf: interval from parameters

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Danny Van Elsen
Danny Van Elsen 2020-4-10
评论： darova 2020-4-10
hello. when plotting this surface
syms u v
x = u;
y = v;
z = 4 - u^2 - v^2;
%fsurf(x, y, z, [-4 4 -4 4])
fsurf(x, y, z)
I was wondering if there is a way to specify the interval in terms of the u and v parameters?
for example, when u^2 + v^2 must be <= 4, something like
fsurf(x, y, z, [ u^2 + v^2 <= 4])
regards, Danny.

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darova
darova 2020-4-10
If i plot something round i usually use polar coordinates
t = linspace(0,2*pi,30); % angle array
r = 0:5; % radius array
[T,R] = meshgrid(t,r); % create grid
z = 4 - R.^2;
[x,y] = pol2cart(T,R); % convert to cartesian
surf(x, y, z)
  2 个评论
Danny Van Elsen
Danny Van Elsen 2020-4-10
ok, thank you for this workaround.
but does this mean that the original question is impossible?
something like
fsurf(x, y, z, [ u^2 + v^2 <= 4])
?
darova
darova 2020-4-10
I think it's impossible

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