Create codistributed sparse array of uniformly distributed pseudo-random values
CS = codistributed.sprand(m,n,density)
CS = sprand(n,codist)
CS = codistributed.sprand(m,n,density) creates
n sparse codistributed
array with approximately
distributed nonzero double entries.
Optional arguments to
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. For information on constructing codistributor objects, see
the reference pages for
'noCommunication' — Specifies
that no interworker communication is to be performed when constructing
the array, skipping some error checking steps.
CS = sprand(n,codist) is the same as
= codistributed.sprand(n, codist). You can also use the
optional arguments with this syntax. To use the default distribution
scheme, specify a codistributor constructor without arguments. For
spmd CS = codistributed.sprand(8,8,0.2,codistributor1d()); end
With four workers,
spmd(4) CS = codistributed.sprand(1000,1000,0.001); end
creates a 1000-by-1000 sparse codistributed double array
approximately 1000 nonzeros.
CS is distributed
by its second dimension (columns), and each worker contains a 1000-by-250
local piece of
spmd(4) codist = codistributor1d(2,1:numlabs); CS = sprand(10,10,0.1,codist); end
creates a 10-by-10 codistributed double array
approximately 10 nonzeros.
CS is distributed by
its columns, and each worker contains a 10-by-
When you use
sprand on the workers in the
parallel pool, or in an independent or communicating job (including
pmode), each worker sets its random generator seed to a value that
depends only on the
labindex or task ID. Therefore,
the array on each worker is unique for that job. However, if you repeat
the job, you get the same random data.