How to get the compressed row sparse CRS in a matrix ?

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I want to get the compressed row sparse (CRS) of the following matrix.
A=[ 1 0 -2 0 0;...
2 8 0 1 0;...
0 0 3 0 -2;...
0 -3 2 0 0;...
1 2 0 0 -4]
So far I have the folliwing code but how ever I do not know to get the row pointer. Hoow do I get the row pointer for the above matrix ?
So far i have...
n=length(A);
c=1;
for i=1:n
for j=1:n
if A(i,j) ~= 0;
row(c,1)=i;
col(c,1)=j;
val(c,1)=A(i,j);
index(c,1)= c;
data = {index, val};
c=c+1;
end
end
end

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