Choosing Specific Elements from An Array

Hi,

My problem is:

I have a matrix A. From it, I want to choose only some of the specific elements and place them in another array B at the specified locations. But, by default it is becoming of the same dimension as A, with zero at those locations. How to get only the non-zero elements at the specified locations with no zeros?

A=[1 2 3 4 5;
6 7 8 9 10;
11 12 13 14 15;
16 17 18 91 20;
21 22 23 24 25];

B(1,3)=A(1,3);
B(2,2:4)=A(2,2:4);
B(3,1:5)=A(3,1:5);
B(4,2:4)=A(4,2:4);
B(5,3)=A(5,3);

Thanking You!

Answer 1

[Andrei Bobrov]

[ii,jj] = ndgrid(1:5);
k = abs(ii-jj)<=2;
B = A.*(k&fliplr(k));

ADD

A1 = A';
B = A1(k&fliplr(k));

Answer 2

[Azzi Abdelmalek]

B=[A(1,3) A(2,2:4) A(3,2:5) A(4,2:4) A(5,3)]

Answer 3

[Image Analyst]

Try this:

out = A(B~=0)

[Azzi Abdelmalek]

If A(5,3) is equal to 0,this will not work