MATLAB Answers

how to plot this ?

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diadalina
diadalina on 21 Apr 2019
Commented: KSSV on 23 Apr 2019
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 Comments

Walter Roberson
Walter Roberson on 21 Apr 2019
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
diadalina on 21 Apr 2019
thank mr walter for your response, i mean by his half radius, the line that cuts its half radius
Walter Roberson
Walter Roberson on 21 Apr 2019
Which angle should it be drawn at?

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Answers (1)

KSSV
KSSV on 22 Apr 2019
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 Comments

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Walter Roberson
Walter Roberson on 22 Apr 2019
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
diadalina on 22 Apr 2019
thank you mr walter for your help ;
KSSV
KSSV on 23 Apr 2019
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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