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matrix.item(*args)
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Copy an element of an array to a standard Python scalar and return it.
Parameters: *args : Arguments (variable number and type)
- none: in this case, the method only works for arrays with one element (
a.size == 1
), which element is copied into a standard Python scalar object and returned. - int_type: this argument is interpreted as a flat index into the array, specifying which element to copy and return.
- tuple of int_types: functions as does a single int_type argument, except that the argument is interpreted as an nd-index into the array.
Returns: z : Standard Python scalar object
A copy of the specified element of the array as a suitable Python scalar
Notes
When the data type of
a
is longdouble or clongdouble, item() returns a scalar array object because there is no available Python scalar that would not lose information. Void arrays return a buffer object for item(), unless fields are defined, in which case a tuple is returned.item
is very similar to a[args], except, instead of an array scalar, a standard Python scalar is returned. This can be useful for speeding up access to elements of the array and doing arithmetic on elements of the array using Python?s optimized math.Examples
>>> x = np.random.randint(9, size=(3, 3)) >>> x array([[3, 1, 7], [2, 8, 3], [8, 5, 3]]) >>> x.item(3) 2 >>> x.item(7) 5 >>> x.item((0, 1)) 1 >>> x.item((2, 2)) 3
- none: in this case, the method only works for arrays with one element (
matrix.item()
2017-01-10 18:11:13
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