How to draw a Circle in Matlab

This also works in GNU-Octave,

FreeMat, Scilab and Scicoslab

We’re going to use paremetric equations to

describe a circumference in 5 easy steps.

1st. Step: define the values of the angles to

be considered.

angle = linespace(0, 2*pi, 360);

this defines 360 values from 0 to 2π radians.

2nd. Step: calculate the horizontal values of

your points:

x = cos(angle);

3rd. Step: calculate the vertical values of

your points:

y = sin(angle);

4th. Step: plot your 360 pairs of x and y

values:

plot(x, y)

5th. Step: force your x distance to equal

your y-distance in the plot:

axis('equal')

So this short code:

angle = linspace(0, 2*pi, 360);

x = cos(angle);

y = sin(angle);

plot(x, y)

axis('equal')

Produces this plot:

For more examples and details, visit:

matrixlab-examples.com/matlab-plot.html