Vectors merging dynamically

I have the following code

1  for i=1:Lev
2     R=A{i};
3     UTRP = crqa(R,[],[],[],threshold);
4     TRPfeat=[TRPfeat; UTRP];
5     UTRP=0;
6   end

In line 4, I am increment row of a matrix dynamically as loop increases.

Is there any other efficient way to do this? I need fast calculation, because the above code taking long time to execute...

Answer 1

[Andrei Bobrov]

TRPfeat = cell2mat(cellfun(@(x)crqa(x,[],[],[],threshold),A(:),'un',0))

Answer 2

[Jan]

C = cell(1, Lev);
for i = 1:Lev
   C{i} = crqa(A{i}, [], [], [], threshold);
end
TRPfeat = cat(2, C{:});

If Lev is large, the missing pre-allocation in CAT matters. Then use FEX: Cell2Vec.mex.