MATLAB: Matrix extract without using for loop

Question

I have matrix like below

A=[ 1  2  3  4  5  6  7;
    8  9 10 11 12 13 14;
   15 16 17 18 19 20 21];
start=[1 3 4];  rowSize=2;

if I use for loop,

B=zeros(3,3);
for i=1:3
 B(i,:)=A(i,start(i):start(i)+rowSize);
end

This will give

B =
       1     2     3
      10    11    12
      18    19    20

Is ther anyway I can do the same process without using the for loop?

Answer 1

start=[1 3 4];
rowSize=2;
out = cell2mat(arrayfun(@(i1)A(i1,start(i1)+(0:rowSize)),(1:size(A,1))','un',0));

OR

start=[1 3 4];
rowSize=2;
n = size(A,1);
out = A(bsxfun(@plus,(bsxfun(@plus,start',0:rowSize)-1)*n,(1:n)'));