p=malt(p0,r,n) p=zeros(n+1,1); p(1)=p0; for i=1:n p(i+1)=(1+r)*p(i); end 

I wrote this program (in matlab) to find the population of the US and it works good, where ( p0=initial population, r=annual growth rate, n=years). I want to modify the code using while loop to be able to find how long till the population doubled from a certain year.

i tried this but is not working:

g = popdouble(p0,r) p{1}=p0; i = 1; while (p{i} 
%need help with my coding