rama_krish627

Branch Unspecified

18 Nov 2008

**Sparse Matrix**

Hi

Can any one tell me how to represent a Sparse Matrix using arrays.

and also how to add two sparse matrices.😲

Can any one tell me how to represent a Sparse Matrix using arrays.

and also how to add two sparse matrices.😲

manupep

Branch Unspecified

18 Nov 2008

sparse matrix is a matrix contain large no of elements but most of them are zeros("0") . So inorder to save the memory utilization we are not storing the zeros, only othr elements. Any sparse matrix has only 3 colums . but the row number depends on the number of non-zero elements.

format is

<row-no> <column-no> <value>

<row-no> <column-no> <value>

-------------------------------

eg:

3 0

0 8 reprents in sparse form as

0 0 3

1 1 8

I cant explain the whole procedure of adding becz i'min office now

first you make sure that order of 3 matx are same. then sameposition elements should be added and make the resultant. I think u can able to make the logic.

format is

<row-no> <column-no> <value>

<row-no> <column-no> <value>

-------------------------------

eg:

3 0

0 8 reprents in sparse form as

0 0 3

1 1 8

I cant explain the whole procedure of adding becz i'min office now

first you make sure that order of 3 matx are same. then sameposition elements should be added and make the resultant. I think u can able to make the logic.

komputergeek

Branch Unspecified

19 Nov 2008

//Addition k=n2; for(i=0;i<n1;i++) { flag=0; for(j=0;j<n2;j++) { if( a[i][0] == b[j][0] && a[i][1]==b[j][1] ) { flag=1; break; } } if( flag==1) b[j][2]=b[j][2] + a[i][2]; else { b[k][0]=a[i][0]; b[k][1]=a[i][1]; b[k][2]=a[i][2]; b[k][0]=b[i][0]; b[k][1]=b[i][1]; b[k][2]=b[i][2]; k++; } } //result of addition is stored in bThis is just a logic.I haven't compiled the code.So expect errors in it 😎

Let me know if it works.

niraj.kumar

Branch Unspecified

20 Nov 2008

just want to add ... the purpose of sparse matrix is 2 save memory and it is used when you have few information is a big space. So to preserve the memory we use sparse matrix

rama_krish627

Branch Unspecified

21 Nov 2008

ok fine I understood what it is.

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