# what is sparse matrices, can someone share the C/Java code for creation of sparse matrix?

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what is sparse matrices, can someone share the C/Java code for creation of sparse matrix?
posted Sep 19, 2016
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suppose

``````A(n,m) =
1 2 3
4 5 6
7 8 9

and

B(p, q) =
1 1
1 1
``````

What is best method to find min of square of difference of sub-matrices of A and B e.g.

sub-matrices of A =

``````1 2    |     2 3   |    4 5    |   5 6
3 4    |     5 6   |    7 8    |   8 9
``````

Difference of first sub-matrix of A with B =

``````(1-1)  (2-1)    = |     0 1
(3-1)  (4-1)      |     2 3
``````

sum of square of elements = `0*0 + 1*1 + 2*2 + 3*3 = 14`

similar steps for other sub-matrices of A

Please suggest looking for an alternate method or algorithm which has time complexity less than `O(n*m*p*q)`

Does anyone know how to rotate a 2d matrix circularly for n times in suppose C language...? It would be a lot of help if you could explain with code.

Hint : Each time each row vector needs to be rotated one element to the right relative to the preceding row vector.