exist - Check whether Composite is defined on labs

Syntax

Description

h = exist(C, labidx) returns true if the entry in Composite C has a defined value on the lab with labindex labidx, false otherwise. In the general case where labidx is an array, the output h is an array of the same size as labidx, and h(i) indicates whether the Composite entry labidx(i) has a defined value.

h = exist(C) is equivalent to h = exist(C, 1:length(C)).

If exist(C, labidx) returns true, C(labidx) does not throw an error, provided that the values of C on those labs are serializable. The function throws an error if the lab indices are invalid.

Examples

Define a variable on a random number of labs. Check on which labs the Composite entries are defined, and get all those values:

 spmd
   if rand() > 0.5
       c = labindex;
   end
 end
 ind = exist(c);
 cvals = c(ind);

See Also

Composite

© 1984-2012- The MathWorks, Inc.    -   Site Help   -   Patents   -   Trademarks   -   Privacy Policy   -   Preventing Piracy   -   RSS