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CategoryArray: Creation

false — Create logical arrays filled with false values.

false creates logical arrays filled with false values. RunMat mirrors MATLAB sizing semantics across scalar, vector, matrix, and N-D forms.

How does the false function behave in MATLAB / RunMat?

  • false() returns the scalar logical false.
  • false(n) returns an n x n logical array of false values.
  • false(m, n, ...) returns a logical array with the requested dimensions.
  • false(sz) accepts a size vector (row or column) and returns an array with prod(sz) elements arranged using MATLAB column-major ordering.
  • false(A) returns a logical array of false with the same size as A.
  • false(___, 'like', prototype) uses the prototype only for sizing; the result is still a host logical array.
  • false(___, 'logical') is accepted for MATLAB compatibility and has no effect.

Examples of using false in MATLAB / RunMat

Creating a 2x3 logical array of false values

mask = false(2, 3)

Expected output:

mask = [0 0 0; 0 0 0]

Creating a logical array from a size vector

dims = [1 4 2];
mask = false(dims)

Expected output:

mask =
  1x4x2 logical array
     0     0     0     0
     0     0     0     0

Creating a false mask with the same size as an existing array

A = rand(2, 2);
mask = false(A)

Expected output:

mask =
  2x2 logical array
     0     0
     0     0

FAQ

What does false() return?

It returns the logical scalar false.

Does false(n) create a square array?

Yes. false(n) returns an n x n logical array of false values, matching MATLAB behavior.

How does false(sz) interpret a size vector?

A row or column vector is treated as the full set of dimensions, so false([2 3 4]) yields a 2x3x4 logical array.

Does false keep results on the GPU?

No. The builtin always returns a host logical array. gpuArray inputs are only used to infer the output size.

Is the 'logical' option required?

No. false always returns logical values; the 'logical' option is accepted only for MATLAB compatibility.

See also

true, logical, islogical, zeros

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