User`s guide

codistributed.build

11-27

% Distribute the matrix over the second dimension (columns),

% and let the codistributor derive the partition from the

% global size.

codistr = codistributor1d(2, ...

codistributor1d.unsetPartition, globalSize)

% On 4 workers, codistr.Partition equals [251, 250, 250, 250].

% Allocate storage for the local part.

localSize = [N, codistr.Partition(labindex)];

L = zeros(localSize);

% Use globalIndices to map the indices of the columns

% of the local part into the global column indices.

globalInd = codistr.globalIndices(2);

% On 4 workers, globalInd has the values:

% 1:251 on worker 1

% 252:501 on worker 2

% 502:751 on worker 3

% 752:1001 on worker 4

% Initialize the columns of the local part to

% the correct value.

for localCol = 1:length(globalInd)

globalCol = globalInd(localCol);

L(:, localCol) = globalCol;

end

D = codistributed.build(L, codistr)

end