# Logic functions¶

## Truth value testing¶

 all(a[, axis, out, keepdims, where]) Test whether all array elements along a given axis evaluate to True. any(a[, axis, out, keepdims, where]) 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(element) Returns True if the type of element 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[, equal_nan]) 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.