User`s guide

codistributor2dbc

11-47

codist = codistributor2dbc(lbgrid,blksize,orient,gsize) forms

a codistributor object that distributes arrays with the global size gsize. The

resulting codistributor object is complete and can therefore be used to build a

codistributed array from its local parts with codistributed.build. To use

the default values for lab grid, block size, and orientation, specify them using

codistributor2dbc.defaultLabGrid, codistributor2dbc.defaultBlockSize,

and codistributor2dbc.defaultOrientation, respectively.

Examples

Use a codistributor2dbc object to create an N-by-N matrix of ones.

N = 1000;

spmd

codistr = codistributor2dbc();

D = ones(N,codistr);

end

Use a fully specified codistributor2dbc object to create a trivial N-by-N codistributed

matrix from its local parts. Then visualize which elements are stored on worker 2.

N = 1000;

spmd

codistr = codistributor2dbc(...

codistributor2dbc.defaultLabGrid, ...

codistributor2dbc.defaultBlockSize, ...

'row',[N,N]);

myLocalSize = [length(codistr.globalIndices(1)), ...

length(codistr.globalIndices(2))];

myLocalPart = labindex*ones(myLocalSize);

D = codistributed.build(myLocalPart,codistr);

end

spy(D==2);