Unrecognized function or variable 'Plot_circle'

Hi everybody,

I am new in matlab, and I am trying to make a graph which contains circles of the same radio randomly distributed in a square. I am trying to build it as a function which I can change the number of circles into the square and the radio.

This is the function:

function circle= Generate_circle (x,y,r,N)

%input:

%x=[x1 x2]boundaries of the box

%y=[y1 y2]boundaries of the box

%r: radio of circles

%N: Number of circles

%output

for i=1:1:N

while 1

x1=min(x)+(max(x)-min(x))*rand(1);

y1=min(y)+(max(y)-min(y))*rand(1);

%Define theta range

theta=pi/2*rand(1);

v=2*rand(1)-1;

x2=x1+r*sqrt(1-v^2)*cos(theta);

y2=y1+r*sqrt(1-v^2)*sin(theta);

if x2<=x(2) && x2>=x(1) && y2<=y(2) && y2>=y(1)

break;

end

end

circle(i,1)=x1;

circle(i,2)=y1;

circle(i,3)=x2;

circle(i,4)=y2;

end

Then, I called the function to produce the coordinates and to do the plot as follow:

clc; clear; close all;

x=[0 100];

y=[0 100];

N=11;

r=5;

circle = Generate_circle (x,y,r,N);

Plot_circle(x,y,circle);

It does produce the coordinates, it does not plot it. Can anyone tell me where I am failling in the code. Thank in advance

[Dyuman Joshi]

Try this as your last command -

plot(x,y,circle)

Answer 1

[Image Analyst]

Try it this way, using viscircles in the Image Processing Toolbox:

clc;    % Clear the command window.
%fprintf('Beginning to run %s.m ...\n', mfilename);
close all;  % Close all figures (except those of imtool.)
clearvars;
workspace;  % Make sure the workspace panel is showing.
format long g;
format compact;
fontSize = 18;
% Then, I called the function to produce the coordinates and to do the plot as follow:
x=[0 100];
y=[0 100];
N=11;
r=5;
circle = Generate_circle (x,y,r,N);
% Get centers
xCenters = mean(circle(:, [1,3]), 2);
yCenters = mean(circle(:, [2,4]), 2);
viscircles([xCenters, yCenters], r);
grid on;
axis equal;

function circle = Generate_circle (x,y,r,N)
%input:
%x=[x1 x2]boundaries of the box
%y=[y1 y2]boundaries of the box
%r: radio of circles
%N: Number of circles
%output
for i=1:1:N
    while 1
        x1=min(x)+(max(x)-min(x))*rand(1);
        y1=min(y)+(max(y)-min(y))*rand(1);
        %Define theta range
        theta=pi/2*rand(1);
        v=2*rand(1)-1;
        x2=x1+r*sqrt(1-v^2)*cos(theta);
        y2=y1+r*sqrt(1-v^2)*sin(theta);
        if x2<=x(2) && x2>=x(1) && y2<=y(2) && y2>=y(1)
            break;
        end
    end
    circle(i,1)=x1;
    circle(i,2)=y1;
    circle(i,3)=x2;
    circle(i,4)=y2;
end
end