Documentation Center

  • Trial Software
  • Product Updates

false

Array of logical 0 (false)

Syntax

F = false(sz,arraytype)

F = false(sz,'like',P)

C = false(sz,codist)
C = false(sz,___,codist,'noCommunication')
C = false(sz,___,codist,'like',P)

Description

F = false(sz,arraytype) creates a matrix with false values in all elements.

The size and type of array are specified by the argument options according to the following table.

ArgumentValuesDescriptions
sznSpecifies size as an n-by-n matrix.
m,n or [m n]Specifies size as an m-by-n matrix.
m,n,...,k or [m n ... k]Specifies size as an m-by-n-by-...-by-k array.
arraytype'distributed'Specifies distributed array.
'codistributed'Specifies codistributed array, using the default distribution scheme.
'gpuArray'Specifies gpuArray.

F = false(sz,'like',P) creates an array of false values with the same type as array P.

C = false(sz,codist) creates a codistributed array of false values with the specified size. The codistributor object codist specifies the distribution scheme for creating the codistributed array. For information on constructing codistributor objects, see the reference pages for codistributor1d and codistributor2dbc. To use the default distribution scheme, you can specify a codistributor constructor without arguments. For example:

spmd
    C = false(8,codistributor1d());
end

C = false(sz,___,codist,'noCommunication') specifies that no interworker communication is to be performed when constructing a codistributed array, skipping some error checking steps.

C = false(sz,___,codist,'like',P) creates a codistributed array of false values with the specified size and distribution scheme. If the codistributor argument is omitted, the distribution scheme is taken from the codistributed array P.

Examples

Create Distributed False Matrix

Create a 1000-by-1000 distributed array of falses with underlying class double:

D = false(1000,'distributed');

Create Codistributed False Matrix

Create a 1000-by-1000 codistributed matrix of falses, distributed by its second dimension (columns).

spmd(4)
    C = false(1000,'codistributed');
end

With four workers, each worker contains a 1000-by-250 local piece of C.

Create a 1000-by-1000 codistributed matrix of falses, distributed by its columns.

spmd(4)
    codist = codistributor('1d',2,100*[1:numlabs]);
    C = false(1000,1000,codist);
end

Each worker contains a 100-by-labindex local piece of C.

Create gpuArray False Matrix

Create a 1000-by-1000 gpuArray of falses:

G = false(1000,'gpuArray');

See Also

| | | | | |

Was this topic helpful?