# How do I make this code into a function I can't manipulate=?

1 view (last 30 days)
Emma on 4 Mar 2021
Commented: Rik on 9 Mar 2021
How do i make this code into a function?
(This code creates a graph with randomly plotted ellipses)
rng(675382) %regenerates the same values for randn
N = 20;
for R = 1:N %for loop to repeat 10 times
t = linspace(0,2*pi); % t defined angle??? not sure
xc = randn; %defines one of axis as random
x = xc + randn*cos(t);
yc = randn;
y = yc + randn*sin(t);
plot(x,y)
patch(x,y,rand)
hold on %puts all ellipses on same graph
end
My end goal is to rotate the fucntion with a rotation matrix.
Rik on 4 Mar 2021
What exactly do you want to rotate? You can't rotate a Matlab function, and your code doesn't seem to describe a mathematical function.

Monisha Nalluru on 9 Mar 2021
From my understanding you wanted to get x,y matrix after performing the operations from a function
These can be done by adding return type to function
function [X,Y] = generatematrix(N)
X=[];
Y=[];
for R = 1:N %for loop to repeat N times
t = linspace(0,2*pi);
xc = randn;
x = xc + randn*cos(t);
yc = randn;
y = yc + randn*sin(t);
X=[X;x];
Y=[Y;y];
plot(x,y)
patch(x,y,rand)
hold on
end
end
Now you can calculate rotation matrix using X,Y
Rik on 9 Mar 2021
Why no preallocation? You know how large the resulting matrix will be, so that would improve the efficiency of your code.