tril -- Return the lower triangle

    call a%tril(l,info[,&
       & diag,imin,imax,jmin,jmax,rscale,cscale,u])

Returns the lower triangular part of submatrix A(imin:imax,jmin:jmax), optionally rescaling row/col indices to the range 1:imax-imin+1,1:jmax-jmin+1 and returing the complementary upper triangle.

Type:

Asynchronous.

On Entry

a

the sparse matrix.
A variable of type psb_Tspmat_type.
Scope: local.

diag

Include diagonals up to this one; diag=1 means the first superdiagonal, diag=-1 means the first subdiagonal. Default 0.

imin,imax,jmin,jmax

Minimum and maximum row and column indices.
Type: optional.

rscale,cscale

Whether to rescale row/column indices. Type: optional.

On Return

l

A copy of the lower triangle of a.
A variable of type psb_Tspmat_type.

u

(optional) A copy of the upper triangle of a.
A variable of type psb_Tspmat_type.

info

Return code.