Error trying to plot circle

Hi I am trying to plot a circle but I alsways get the same error "

Error in circle (line 11) a = r.*cos(v)+j;

Can you see why?

My script:

A = [10 8 2; 10 8 1; -2 9 1; 2 -1 1]
B = [50; 60; 26; 2]
M = A.' * A;
d = A.' * B;
x = A\B;

j = 2.3102
o = 2.8380
r = x.'
v = 0:pi/100:2*pi;
a = r.*cos(v)+j;
b = r.*sin(v)+o;
plot(a,b)

Answer 1

[Star Strider]

You apparently want to plot three different circles with different radii.

This works:

A = [10 8 2; 10 8 1; -2 9 1; 2 -1 1]
B = [50; 60; 26; 2]
M = A.' * A;
d = A.' * B;
x = A\B;

j = 2.3102
o = 2.8380
r = x.'
v = 0:pi/100:2*pi;
a = r(:)*cos(v)+j;
b = r(:)*sin(v)+o;

figure
plot(a.',b.')
axis equal

The transpositions in the plot call are necessary. Otherwise you get a ‘starburst’ effect that while interesting, is not what you indicated that you want.