codistributed.colon - Distributed colon operation

Syntax

Description

codistributed.colon(a,d,b) partitions the vector a:d:b into numlabs contiguous subvectors of equal, or nearly equal length, and creates a codistributed array whose local portion on each lab is the labindex-th subvector.

codistributed.colon(a,b) uses d = 1.

Optional arguments to codistributed.colon must be specified after the required arguments, and in the following order:

• codist — A codistributor object specifying the distribution scheme of the resulting vector. If omitted, the array is distributed using the default distribution scheme. For information on constructing codistributor objects, see the reference pages for codistributor1d and codistributor2dbc.

• 'noCommunication' — Specifies that no communication is to be performed when constructing the vector, skipping some error checking steps.

Examples

Partition the vector 1:10 into four subvectors among four labs.

spmd(4); C = codistributed.colon(1,10), end
Lab 1: 
  This lab stores C(1:3).
          LocalPart: [1 2 3]
      Codistributor: [1x1 codistributor1d]
Lab 2: 
  This lab stores C(4:6).
          LocalPart: [4 5 6]
      Codistributor: [1x1 codistributor1d]
Lab 3: 
  This lab stores C(7:8).
          LocalPart: [7 8]
      Codistributor: [1x1 codistributor1d]
Lab 4: 
  This lab stores C(9:10).
          LocalPart: [9 10]
      Codistributor: [1x1 codistributor1d]

See Also

codistributor1d | codistributor2dbc | colon | for

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