isempty

Test whether the input has zero elements.

Syntax

tf = isempty(A)

Description

Returns logical true when A contains no elements (an empty matrix [], an empty string '', or any other zero-size value), and false otherwise.

In the default script mode, isempty is applied elementwise for non-scalar inputs — useful for checking emptiness of every cell in a cell array. In Excel-compatible mode (cell formulas), the result is always a single scalar.

Examples

isempty([])         % 1
isempty('')         % 1
isempty([1 2 3])    % 0
isempty(zeros(0,5)) % 1

See also

• isscalar — Test whether the input is a 1×1 scalar.
• isvector — Test whether the input is a vector (one row or one column).
• numel — Total number of elements.
• size — Sizes along all dimensions, or along one specific dimension.