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adj2sp(1) Scilab Function adj2sp(1)
NAME
adj2sp - converts adjacency form into sparse matrix.
CALLING SEQUENCE
A = adj2sp(xadj,adjncy,anz) A = adj2sp(xadj,adjncy,anz,mn)
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).
EXAMPLE
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
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