Bezier Curve problem inside for loop
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Michael Jacobson
il 10 Mar 2018
Commentato: Arthur Vidal
il 11 Mar 2018
Hi, I have a problem when generating multiple points from two x & y functions inside a for loop. If I use the plot function to plot x and y, then the curve will not appear. If I use the scatter function it will plot each point though, but I want a smooth curve.
figure; hold on
for u = 0:.01:10
x = (1-u)^3*1+3*(1-u)^2*u*3+3*(1-u)*u^2*5+u^3*8;
y = (1-u)^3*1+3*(1-u)^2*u*0.5+3*(1-u)*u^2*2.5+u^3*2;
plot(x,y)
scatter(A(1,:),A(2,:))
xlim([0 10])
ylim([0 4])
end
hold off
Also, is there already a built-in function which will achieve what I'm trying to do? If not what would be the best way to create a function to use for future reference?
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Arthur Vidal
il 11 Mar 2018
Hi Michael,
For your case, for is not recommendded. Instead, use vectors and dot operations to get your code working well. The following code should work.
figure; hold on u = 0:.01:10; x = (1-u).^3*1 + 3*(1-u).^2.*u*3 + 3*(1-u).*u.^2*5 + u.^3*8; y = (1-u).^3*1 + 3*(1-u).^2.*u*0.5 + 3*(1-u).*u.^2*2.5 + u.^3*2; plot(x,y) xlim([0 10]) ylim([0 4]) hold off
2 Commenti
Arthur Vidal
il 11 Mar 2018
The way your did first, only one value was being calculated per iteration and you were plotting a single point, not a set of points. Plot needs to have two vectors and it connects all the points with a curve. The dot operation is necessary to work with vectors. Dot operation means that you are multiplying or powering element by element, not the whole vector or matrix.
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