how to preallocate a matrix in Matlab for a 'while' loop?

I want to preallocate a matrix in matlab to get rid of out of memory error, but how can i use preallocating for a while loop? we use preallocating for a for loop like this:

m=10000; x=zeros(m,1) for i = 1:m x(i) = i end 

but what if i want to do this for a while loop

m = 10000 x = 1 i=0 some_criteria = 10 while x<some_criteria i = i+1 x(i) = i some_criteria = f(x) end 

1 Answer

try this:

 m = 10000 x=zeros([],1); i=0 some_criteria = 10 while x<some_criteria i = i+1 x(i,1) = i some_criteria = f(x) end 

if you write x(i) instead of x(i,1), the result will be a row vector.