pymel.util.arrays.ArrayIter¶

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class ArrayIter(a[, axis1[, axis2[, ...]]])¶

A general purpose iterator on Arrays.

ArrayIter allows to iterate on one or more specified axis of an Array, in any order.

For an Array of n dimensions, iterator on p axis will yield sub-arrays of n-p dimensions, numerical components if n-p is 0.

>>> A = Array(range(1, 28), shape=(3, 3, 3))
>>> print A.formated()
[[[1, 2, 3],
  [4, 5, 6],
  [7, 8, 9]],

 [[10, 11, 12],
  [13, 14, 15],
  [16, 17, 18]],

 [[19, 20, 21],
  [22, 23, 24],
  [25, 26, 27]]]
>>> [a for a in A]
[Array([[1, 2, 3], [4, 5, 6], [7, 8, 9]]), Array([[10, 11, 12], [13, 14, 15], [16, 17, 18]]), Array([[19, 20, 21], [22, 23, 24], [25, 26, 27]])]
>>> [a for a in ArrayIter(A, 0)]
[Array([[1, 2, 3], [4, 5, 6], [7, 8, 9]]), Array([[10, 11, 12], [13, 14, 15], [16, 17, 18]]), Array([[19, 20, 21], [22, 23, 24], [25, 26, 27]])]
>>> [a for a in ArrayIter(A, 1)]
[Array([[1, 2, 3], [10, 11, 12], [19, 20, 21]]), Array([[4, 5, 6], [13, 14, 15], [22, 23, 24]]), Array([[7, 8, 9], [16, 17, 18], [25, 26, 27]])]
>>> [a for a in ArrayIter(A, 2)]
[Array([[1, 4, 7], [10, 13, 16], [19, 22, 25]]), Array([[2, 5, 8], [11, 14, 17], [20, 23, 26]]), Array([[3, 6, 9], [12, 15, 18], [21, 24, 27]])]
>>> [a for a in ArrayIter(A, 0, 1)]
[Array([1, 2, 3]), Array([4, 5, 6]), Array([7, 8, 9]), Array([10, 11, 12]), Array([13, 14, 15]), Array([16, 17, 18]), Array([19, 20, 21]), Array([22, 23, 24]), Array([25, 26, 27])]
>>> [a for a in ArrayIter(A, 0, 2)]
[Array([1, 4, 7]), Array([2, 5, 8]), Array([3, 6, 9]), Array([10, 13, 16]), Array([11, 14, 17]), Array([12, 15, 18]), Array([19, 22, 25]), Array([20, 23, 26]), Array([21, 24, 27])]
>>> [a for a in ArrayIter(A, 0, 1, 2)]
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27]
>>> [a for a in ArrayIter(A, 0, 2, 1)]
[1, 4, 7, 2, 5, 8, 3, 6, 9, 10, 13, 16, 11, 14, 17, 12, 15, 18, 19, 22, 25, 20, 23, 26, 21, 24, 27]

ArrayIter iterators support __len__, __getitem__, __setitem__ and __delitem__ methods, it can be used to set whole sub-arrays in any order (for instance rows or columns in MatrixN)

>>> A = Array(range(1, 10), shape=(3, 3))
>>> print A.formated()
[[1, 2, 3],
 [4, 5, 6],
 [7, 8, 9]]
>>> [a for a in ArrayIter(A, 0, 1)]
[1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> len(ArrayIter(A, 0, 1))
9
>>> ArrayIter(A, 0, 1)[5:9] = [4, 3, 2, 1]
>>> print A.formated()
[[1, 2, 3],
 [4, 5, 4],
 [3, 2, 1]]
>>> [a for a in ArrayIter(A, 1)]
[Array([1, 4, 3]), Array([2, 5, 2]), Array([3, 4, 1])]
>>> len(ArrayIter(A, 1))
3
>>> ArrayIter(A, 1)[1] = [7, 8, 9]
>>> print A.formated()
[[1, 7, 3],
 [4, 8, 4],
 [3, 9, 1]]
>>> ArrayIter(A, 0)[1] = 0
>>> print A.formated()
[[1, 7, 3],
 [0, 0, 0],
 [3, 9, 1]]

__delitem__(index)¶

it.__delitem__(index) <==> del it[index]

Note : if it is an ArrayIter built on Array a, it’s equivalent to del a[c] for c in it.toArrayCoords(index)

Warning : Do not use __delitem__ during iteration

>>> A = Array(range(1, 10), shape=(3, 3))
>>> print A.formated()
[[1, 2, 3],
 [4, 5, 6],
 [7, 8, 9]]
>>> [a for a in ArrayIter(A, 0, 1)]
[1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> del ArrayIter(A, 0, 1)[1]
>>> [a for a in ArrayIter(A, 0, 1)]
[4, 6, 7, 9]
>>> print A.formated()
[[4, 6],
 [7, 9]]
>>> [a for a in ArrayIter(A, 1)]
[Array([4, 7]), Array([6, 9])]
>>> del ArrayIter(A, 1)[-1]
>>> print A.formated()
[[4],
 [7]]

__getitem__(index)¶

it.__getitem__(index) <==> it[index]

Returns a single sub-Array or component corresponding to the iterator item designated by index, or an Array of values if index is a slice.

Note : if it is an ArrayIter built on Array a, it’s equivalent to a[c] for c in it.toArrayCoords(index)

>>> A = Array(range(1, 10), shape=(3, 3))
>>> print A.formated()
[[1, 2, 3],
 [4, 5, 6],
 [7, 8, 9]]
>>> [a for a in ArrayIter(A, 0, 1)]
[1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> ArrayIter(A, 0, 1)[4]
5
>>> ArrayIter(A, 0, 1)[0:6]
Array([1, 2, 3, 4, 5, 6])
>>> [a for a in ArrayIter(A, 1)]
[Array([1, 4, 7]), Array([2, 5, 8]), Array([3, 6, 9])]
>>> ArrayIter(A, 1)[1]
Array([2, 5, 8])
>>> ArrayIter(A, 1)[1, 0]
2
>>> print ArrayIter(A, 1)[0:2, 0:2].formated()
[[1, 4],
 [2, 5]]
>>> print A.transpose()[0:2, 0:2].formated()
[[1, 4],
 [2, 5]]

__setitem__(index, value)¶

it.__setitem__(index, value) <==> it[index] = value

Returns a single sub-Array or component corresponding to the iterator item item, or an Array of values if index is a slice.

Note : if it is an ArrayIter built on Array a, it’s equivalent to a[c]=value for c in it.toArrayCoords(index) or a[c] = value[i] for i, c in enumerate(it.toArrayCoords(index)) if an iterable of values of suitable shapes was provided.

>>> A = Array(range(1, 10), shape=(3, 3))
>>> print A.formated()
[[1, 2, 3],
 [4, 5, 6],
 [7, 8, 9]]
>>> [a for a in ArrayIter(A, 0, 1)]
[1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> ArrayIter(A, 0, 1)[4] = 10
>>> [a for a in ArrayIter(A, 0, 1)]
[1, 2, 3, 4, 10, 6, 7, 8, 9]
>>> print A.formated()
[[1, 2, 3],
 [4, 10, 6],
 [7, 8, 9]]
>>> ArrayIter(A, 0, 1)[0:3] = 1
>>> [a for a in ArrayIter(A, 0, 1)]
[1, 1, 1, 4, 10, 6, 7, 8, 9]
>>> print A.formated()
[[1, 1, 1],
 [4, 10, 6],
 [7, 8, 9]]
>>> ArrayIter(A, 0, 1)[5:9] = [4, 3, 2, 1]
>>> [a for a in ArrayIter(A, 0, 1)]
[1, 1, 1, 4, 10, 4, 3, 2, 1]
>>> print A.formated()
[[1, 1, 1],
 [4, 10, 4],
 [3, 2, 1]]
>>> [a for a in ArrayIter(A, 1)]
[Array([1, 4, 3]), Array([1, 10, 2]), Array([1, 4, 1])]
>>> ArrayIter(A, 1)[1]
Array([1, 10, 2])
>>> ArrayIter(A, 1)[1, 1] = 5
>>> print A.formated()
[[1, 1, 1],
 [4, 5, 4],
 [3, 2, 1]]
>>> ArrayIter(A, 1)[-1] = [7, 8, 9]
>>> print A.formated()
[[1, 1, 7],
 [4, 5, 8],
 [3, 2, 9]]
>>> ArrayIter(A, 0)[1] = 0
>>> print A.formated()
[[1, 1, 7],
 [0, 0, 0],
 [3, 2, 9]]

next() → the next value, or raise StopIteration¶

toArrayCoords(index, default=None)¶

it.toArrayCoords(index, default=None) –> list or tuple

Converts an iterator item index (item of number index in the iterator) for that Array iterator to a tuple of axis coordinates for that Array, returns a single coordinates tuple or a list of coordinate tuples if index was a slice. If index is a multi-index (a tuple), the first element if index is checked against the iterator and the remaining elements are considered indices on the iterated sub-array (s).

>>> A = Array(range(1, 10), shape=(3, 3))
>>> print A.formated()
[[1, 2, 3],
 [4, 5, 6],
 [7, 8, 9]]
>>> [a for a in ArrayIter(A, 0, 1)]
[1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> it = ArrayIter(A, 0, 1)
>>> it[4]
5
>>> it.toArrayCoords(4)
(1, 1)
>>> A[1, 1]
5
>>> it[1:4]
Array([2, 3, 4])
>>> it.toArrayCoords(slice(1, 4))
[(0, 1), (0, 2), (1, 0)]

>>> [a for a in ArrayIter(A, 1)]
[Array([1, 4, 7]), Array([2, 5, 8]), Array([3, 6, 9])]
>>> it = ArrayIter(A, 1)
>>> it[0]
Array([1, 4, 7])
>>> it.toArrayCoords(0)
(None, 0)
>>> it.toArrayCoords(0, default=slice(None))
(slice(None, None, None), 0)
>>> A[:, 0]
Array([1, 4, 7])
>>> it.toArrayCoords((0, 1))
(1, 0)
>>> it[0, 1]
4
>>> A[1, 0]
4