How to plot 10 figures on same plot, and How do i find radius inbetween 0 and 1.

So basically, Is there a more cleaner way to do ten random circles on a plot with the x cord and y cordinates with there cordinates between randi([-,8]). Like i have a code doing a function:

function [h] = Circle(x,y,r)
hold on
th = 0:pi/50:2*pi;
xunit = r * cos(th) + x;
yunit = r * sin(th) + y;
h = plot(xunit, yunit);
hold off
end

and i have 10 lines of that function being used to plot 10 different circles. Any way it can be condensed into less that ten lines? Also How can i get my radius to be inbetween [0,1] and not 0 or 1. (It can be one i just want it to be able to pick any number inbetween them.)

Answer 1

[Image Analyst]

Try calling it like this where you pass in the x and y values from your arrays for the centers, and a random number between 0 and 1 for the radius:

for k = 1 : 10
    hold on;
    h(k) = Circle(x(k), y(k),rand(1))
end
hold off;

and take the holds out of Circle if you want 2 fewer lines.

[Nathen Eberhardt]

So I tried what you said, it only resulted in One circle in the plot, needs to be ten different circles in the same plot.

x = randi([-4,8]);

y = randi([-4,8]);

for k = 1 : 10

hold on;

h(k) = CircPlot(x(k), y(k),rand(1))

end

hold off;

[Nathen Eberhardt]

oh sorry the function is actually called CircPlot

[Image Analyst]

I don't think you tried what I said because when I did it worked fine. Since your x and y are just a single number, not a vector of 10 values, I put them into the loop. I also renamed the circle plotting routine to your new name. The code below works just fine. What did you do differently?

hFig = figure;
hFig.WindowState = 'maximized';
for k = 1 : 10
	x = randi([-4,8]);
	y = randi([-4,8]);
	hold on;
	h(k) = CircPlot(x, y, rand(1));
end
hold off;
grid on;
axis 'equal'
% Put lines along the axes
yline(0);
xline(0);

function [h] = CircPlot(x,y,r)
th = 0:pi/50:2*pi;
xunit = r * cos(th) + x;
yunit = r * sin(th) + y;
h = plot(xunit, yunit, 'LineWidth', 2);
end

[Nathen Eberhardt]

I put my x and Y randi commands before the for loop. but Thank you this really helped!

[Image Analyst]

You can do that if you got all 10 values, and it would be more efficient. Here is how a skilled MATLAB programmer would do it:

hFig = figure;
hFig.WindowState = 'maximized';
numberOfCircles = 10;
% Get all 10 center coordinates in advance.  Range is -4 to +8.
x = randi([-4, 8], 1, numberOfCircles);
y = randi([-4, 8], 1, numberOfCircles);
radius = rand(1, numberOfCircles); % Range is 0 to 1.
% Now loop through plotting each circle one at a time.
for k = 1 : 10
	hold on;
	CircPlot(x(k), y(k), radius(k));
end
hold off;
grid on;
axis 'equal'
caption = sprintf('%d Circles', numberOfCircles);
title(caption, 'FontSize', 15);
xlabel('X', 'FontSize', 15);
ylabel('Y', 'FontSize', 15);
% Put lines along the axes
yline(0);
xline(0);

function CircPlot(xCenter, yCenter, radius)
anglesInRadians = 0 : (pi / 50) : (2 * pi);
xCoordinates = radius * cos(anglesInRadians) + xCenter;
yCoordinates = radius * sin(anglesInRadians) + yCenter;
plot(xCoordinates, yCoordinates, '-', 'LineWidth', 2);
end