VectorQ¶

Status: Stable

documented, exercised by the test suite and/or worked examples, with no known limitations recorded.

Description¶

VectorQ[expr]
    gives True if expr is a list, none of whose elements are themselves lists, and gives False otherwise.
VectorQ[expr, test]
    gives True only if test yields True when applied to each of the elements in expr.

VectorQ[expr, NumberQ] tests whether expr is a vector of numbers.

Examples¶

No verified examples yet for this function.

Implementation notes¶

builtin_vectorq (src/list.c) returns True when the argument is a List (is_listq) none of whose elements is itself a List. With a second argument test, each element is instead required to satisfy test[elem] (evaluated, must yield True). Returns False as soon as a check fails.

Attributes: Protected.

Implementation status¶

Stable — documented, exercised by the test suite and/or worked examples, with no known limitations recorded.

References¶

Source: src/list.c
Specification: docs/spec/builtins/expression-information.md

Notes & additional examples¶

Worked examples¶

In[1]:= VectorQ[{1, 2, 3}]
Out[1]= True

In[2]:= VectorQ[{{1, 2}, {3, 4}}]
Out[2]= False

Notes¶

VectorQ is True for a flat list none of whose elements are themselves lists; a list of lists (a matrix) is not a vector.