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logical | Examples |
Convert numeric values to logical
K = logical(A)
K = logical(A)
returns an array that can be used for logical indexing or logical tests.
A(B)
, where B
is a logical array, returns the values of A
at the indices where the real part of B
is nonzero. B
must be the same size as A
.
Logical arrays are also created by the relational operators (==
,<
,>
,~
, etc.) and functions like any
, all
, isnan
, isinf
, and isfinite
.
Given A = [1 2 3; 4 5 6; 7 8 9]
, the statement B = logical(eye(3))
returns a logical array
B = 1 0 0 0 1 0 0 0 1which can be used in logical indexing that returns
A
's diagonal elements:
A(B) ans = 1 5 9However, attempting to index into
A
using the numeric array eye(3)
results in:
A(eye(3))
??? Index into matrix is negative or zero.