You overwrite the value of m multiple times:
m=3;
m=0.1;
m = linspace(0,0.001);
Because projfun is a nested function, it uses the last definition and the expression on the right hand side has 100 elements due to using the vector created by linspace.
This is a fragile code. The editor shows several problems already, so take the time to fix them.
Omit the clear command on top of a function, because it is just a waste of time there. This brute clearing header clc;clf;clear; is called "cargo cult programming".
for i = 1:numel(rr)
n=3; % Never used
...
i=i+1; % Why? This is not the way FOR loops work
end
If you share variables with nested functions, make it crystal clear using comments, which variables are concerned.
