how to plot this ?
显示 更早的评论
i have a circle and i want to plot his half radius in the same figure can anyone help me :
angle=linspace(0,2*pi,360);
x=cos(angle);
y=sin(angle);
plot(x,y)
axis('equal')
3 个评论
Walter Roberson
2019-4-21
I am not sure what you mean about "his half radius" ? Do you mean a second circle with half the radius? If so then plot(x/2, y/2)
diadalina
2019-4-21
Walter Roberson
2019-4-21
Which angle should it be drawn at?
回答（1 个）
KSSV
2019-4-22
angle=linspace(0,2*pi,360)';
C = [0 0] ;
R = 1 ;
x=C(1)+R*cos(angle);
y=C(2)+R*sin(angle);
%
x1 = R/2*cos(angle) ;
y1 = R/2*sin(angle) ;
plot(x,y)
hold on
C1 = repmat(C,length(angle),1) ;
plot([C1(:,1) x1]',[C1(:,2) y1]')
axis('equal')
4 个评论
diadalina
2019-4-22
thank you mr KSSV for your answer but i want somthing like this :
Walter Roberson
2019-4-22
hold on
plot([0 1], [0 0])
hold off
This relies on the fact that the center of the circle is at 0, 0 and the radius of the circle is 1.
diadalina
2019-4-22
KSSV
2019-4-23
angle=linspace(0,2*pi,360)';
C = [0 0] ;
R = 1 ;
x=C(1)+R*cos(angle);
y=C(2)+R*sin(angle);
%
x1 = R*cos(0) ;
y1 = R*sin(0) ;
plot(x,y)
hold on
plot([C(:,1) x1]',[C(:,2) y1]')
axis('equal')
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