This is documentation for an old release of NumPy (version 1.17). Read this page Search for this page in the documentation of the latest stable release (version 2.2).

Logic functions

Truth value testing

all(a[, axis, out, keepdims])	Test whether all array elements along a given axis evaluate to True.
any(a[, axis, out, keepdims])	Test whether any array element along a given axis evaluates to True.

Array contents

isfinite(x, /[, out, where, casting, order, …])	Test element-wise for finiteness (not infinity or not Not a Number).
isinf(x, /[, out, where, casting, order, …])	Test element-wise for positive or negative infinity.
isnan(x, /[, out, where, casting, order, …])	Test element-wise for NaN and return result as a boolean array.
isnat(x, /[, out, where, casting, order, …])	Test element-wise for NaT (not a time) and return result as a boolean array.
isneginf(x[, out])	Test element-wise for negative infinity, return result as bool array.
isposinf(x[, out])	Test element-wise for positive infinity, return result as bool array.

Array type testing

iscomplex(x)	Returns a bool array, where True if input element is complex.
iscomplexobj(x)	Check for a complex type or an array of complex numbers.
isfortran(a)	Check if the array is Fortran contiguous but not C contiguous.
isreal(x)	Returns a bool array, where True if input element is real.
isrealobj(x)	Return True if x is a not complex type or an array of complex numbers.
isscalar(num)	Returns True if the type of num is a scalar type.

Logical operations

logical_and(x1, x2, /[, out, where, …])	Compute the truth value of x1 AND x2 element-wise.
logical_or(x1, x2, /[, out, where, casting, …])	Compute the truth value of x1 OR x2 element-wise.
logical_not(x, /[, out, where, casting, …])	Compute the truth value of NOT x element-wise.
logical_xor(x1, x2, /[, out, where, …])	Compute the truth value of x1 XOR x2, element-wise.

Comparison

allclose(a, b[, rtol, atol, equal_nan])	Returns True if two arrays are element-wise equal within a tolerance.
isclose(a, b[, rtol, atol, equal_nan])	Returns a boolean array where two arrays are element-wise equal within a tolerance.
array_equal(a1, a2)	True if two arrays have the same shape and elements, False otherwise.
array_equiv(a1, a2)	Returns True if input arrays are shape consistent and all elements equal.

greater(x1, x2, /[, out, where, casting, …])	Return the truth value of (x1 > x2) element-wise.
greater_equal(x1, x2, /[, out, where, …])	Return the truth value of (x1 >= x2) element-wise.
less(x1, x2, /[, out, where, casting, …])	Return the truth value of (x1 < x2) element-wise.
less_equal(x1, x2, /[, out, where, casting, …])	Return the truth value of (x1 =< x2) element-wise.
equal(x1, x2, /[, out, where, casting, …])	Return (x1 == x2) element-wise.
not_equal(x1, x2, /[, out, where, casting, …])	Return (x1 != x2) element-wise.