# How can i express many bezier curve in one figure?

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Jin Uk Ye on 11 Oct 2019
Answered: Geoff Hayes on 11 Oct 2019
I have function of bezier curve, like this
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function P=BezierCurve(CV,nPoints)
nCV=size(CV,1)
n=nCV-1;
u=linspace(0,1,nPoints)';
B=zeros(length(u),nCV);
U=zeros(length(u),nCV);
for i=0:n
B(:,i+1)=factorial(n)/(factorial(i)*factorial(n-i));
U(:,i+1)=u.^i.*(1-u).^(n-i);
end
P=B.*U*CV;
close all
CV=[0 0 0;
1 0 0;
1 1 0;
5 10 0]
CV2=[1 1 1;
3 0 1;
4 1 2;
8 10 9]
CV3=[0 100 0;
3 0 1;
4 1 2;
8 10 9]
nPoints=100;
P=BezierCurve(CV, nPoints);
figure;hold on; grid on;
% plot Bezier Curve
plot3(P(:,1), P(:,2), P(:,3),'k')
% plot Control Vertices
plot3(CV(:,1), CV(:,2), CV(:,3),'r:o')
nPoints=100;
P=BezierCurve(CV2, nPoints);
figure;hold on; grid on;
% plot Bezier Curve
plot3(P(:,1), P(:,2), P(:,3),'k')
% plot Control Vertices
plot3(CV2(:,1), CV2(:,2), CV2(:,3),'r:o')
nPoints=100;
P=BezierCurve(CV3, nPoints);
figure;hold on; grid on;
% plot Bezier Curve
plot3(P(:,1), P(:,2), P(:,3),'k')
% plot Control Vertices
plot3(CV3(:,1), CV3(:,2), CV3(:,3),'r:o')
If i execute this, is is expressed in three figures, not in one figure.
what do i need to fix to represent multipole lines in a single figure?

Geoff Hayes on 11 Oct 2019
Jin - you call
figure;hold on; grid on;
three times and so create three figures. If you just want all the plots on a single figure, then keep the first line that does the above, and remove the last two.