User`s guide

11 Functions — Alphabetical List
11-32
codistributed.spalloc
Allocate space for sparse codistributed matrix
Syntax
SD = codistributed.spalloc(M, N, nzmax)
SD = spalloc(M, N, nzmax, codist)
Description
SD = codistributed.spalloc(M, N, nzmax) creates an M-by-N all-zero sparse
codistributed matrix with room to hold nzmax nonzeros.
Optional arguments to codistributed.spalloc must be specified after the required
arguments, and in the following order:
• codist — A codistributor object specifying the distribution scheme of the resulting
array. If omitted, the array is distributed using the default distribution scheme. The
allocated space for nonzero elements is consistent with the distribution of the matrix
among the workers according to the Partition of the codistributor.
• 'noCommunication' — Specifies that no communication is to be performed when
constructing the array, skipping some error checking steps. You can also use this
argument with SD = spalloc(M, N, nzmax, codistr).
SD = spalloc(M, N, nzmax, codist) is the same as SD =
codistributed.spalloc(M, N, nzmax, codist). You can also use the optional
arguments with this syntax.
Examples
Allocate space for a 1000-by-1000 sparse codistributed matrix with room for up to 2000
nonzero elements. Use the default codistributor. Define several elements of the matrix.
spmd % codistributed array created inside spmd statement
N = 1000;