Plotting 3D parameterised curve help

2016 3 14
1 个回答
更新时间：2016 3 14
8 次查看（30 天）

0 个投票

I want to plot the curve:
r(r, θ) = (rcos(θ), rsin(θ), θ), 0 ≤ r ≤ 1, 0 ≤ θ ≤ 2π.
But I'm not really sure how to go about it.
I have tried this:
r = linspace(0,1);
theta = linspace (0,2.*pi);
x = r*cos(theta);
y = r*sin(theta);
z = theta;
plot(x,y,z)
However it keeps resulting in error.
Any help would be greatly appreciated, thanks

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回答（1 个）

Star Strider
Star Strider 2016-3-14
编辑：Star Strider 2016-3-14

0 个投票

Since ‘r’ and ‘theta’ have the same number of elements (by default 100 with linspace), you can use element-wise multiplication:
r = linspace(0,1);
theta = linspace (0,2*pi);
x = r.*cos(theta);
y = r.*sin(theta);
z = theta;
figure(1)
plot3(x, y, z)
grid on
That should do what you want (plot an Archimedes spiral).

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