adj2sp
adj2sp — converts adjacency form into sparse matrix.
Parameters
| xadj | : integer vector of length (n+1). |
| adjncy | : integer vector of length nz containing the row indices for the corresponding elements in anz |
| anz | : column vector of length nz, containing the non-zero elements of A |
| mn | : row vector with 2 entries, mn=size(A) (optional). |
| A | : real or complex sparse matrix (nz non-zero entries) |
Description
sp2adj converts an adjacency form representation of a matrix
into its standard Scilab representation (utility fonction).
xadj, adjncy, anz = adjacency representation of A i.e:
xadj(j+1)-xadj(j) = number of non zero entries in row j.
adjncy = column index of the non zeros entries
in row 1, row 2,..., row n.
anz = values of non zero entries in row 1, row 2,..., row n.
xadj is a (column) vector of size n+1 and
adjncy is an integer (column) vector of size nz=nnz(A).
anz is a real vector of size nz=nnz(A).
Examples
A = sprand(100,50,.05);
[xadj,adjncy,anz]= sp2adj(A);
[n,m]=size(A);
p = adj2sp(xadj,adjncy,anz,[n,m]);
A-p,
See also
sp2adj, spcompack
