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