Arranging the fields of a structure into order - arrays

Question

I am trying find away of ordering a polynomial in the form a structure so that the exponent fields are in ascending order. I don't want to use a built in sort function to do this.
for example the polynomial:
p = struct('exponent',{2,3,2,9},'coeff',{1,2,91,40})
represents the polynomial:
p = 1(x^2) + 2(x^3) + 91(x^2)+ 40(x^9)
I want to rearrange it so that it becomes (the exponents are now in ascending order)
p = 1(x^2) + 91(x^2) + 2(x^3) + 40(x^9)
my code to do this is:
function [ output ] = myMergepoly2( p )
h=1;
output(1,length(p))=struct('exponent',{},'coeff',{});
while (h<length(p))
if p(1,h+1).exponent<p(1,h).exponent
output(1,h).exponent = p(1,h+1).exponent;
output(1,h).coeff = p(1,h+1).coeff;
h=h+1;
else
output(1,h).exponent = p(1,h).exponent;
output(1,h).coeff = p(1,h).coeff;
end
end
end
However when I try to run this function MATLAB remote has 'busy' written out with no error message. I am unsure what is causing this and how to fix it, any help would be appreciated.

Answer 1

In the else section of the loop, you don't increment h, so it goes like this:
h=1 --> if p(1,h+1).exponent<p(1,h).exponent is false --> skip to else loop and set output(1,1).exponent --> h=1 (while loop keeps going).
Using MATLAB inbuilt sort I'd just do something along the lines of:
exponent = [p.exponent];
coeff = [p.coeff];
[exponent idx] = sort(exponent);
output.exponent = exponent;
output.coeff = coeff(idx);

Answer 2

Replace this line :
output(1,length(p))=struct('exponent',{},'coeff',{});
With this line :
output = struct('exponent',cell(1,length(p)),'coeff',cell(1,length(p)));
Also put this instead:
while (h<length(p))
if p(1,h+1).exponent<p(1,h).exponent
output(1,h).exponent = p(1,h+1).exponent;
output(1,h).coeff = p(1,h+1).coeff;
else
output(1,h).exponent = p(1,h).exponent;
output(1,h).coeff = p(1,h).coeff;
end
h=h+1;
end
However I'm still not getting the right output, I'm working on it.