a = np.arange(1, 101).reshape(10, 10)
a
array([[ 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, 28, 29, 30],
[ 31, 32, 33, 34, 35, 36, 37, 38, 39, 40],
[ 41, 42, 43, 44, 45, 46, 47, 48, 49, 50],
[ 51, 52, 53, 54, 55, 56, 57, 58, 59, 60],
[ 61, 62, 63, 64, 65, 66, 67, 68, 69, 70],
[ 71, 72, 73, 74, 75, 76, 77, 78, 79, 80],
[ 81, 82, 83, 84, 85, 86, 87, 88, 89, 90],
[ 91, 92, 93, 94, 95, 96, 97, 98, 99, 100]])
def reclass_2(a):
'''reclassification using ufunc user functions'''
if a > 80 and a != 91:
a = 8
elif a > 60 and a <= 80:
a = 7
elif (a <= 60) and (a % 2 == 0):
a = 2
else:
a = 0
return a
r = np.frompyfunc(reclass_2, 1, 1)
r
<ufunc '? (vectorized)'>
val =r(a)
array([[0, 2, 0, 2, 0, 2, 0, 2, 0, 2],
[0, 2, 0, 2, 0, 2, 0, 2, 0, 2],
[0, 2, 0, 2, 0, 2, 0, 2, 0, 2],
[0, 2, 0, 2, 0, 2, 0, 2, 0, 2],
[0, 2, 0, 2, 0, 2, 0, 2, 0, 2],
[0, 2, 0, 2, 0, 2, 0, 2, 0, 2],
[7, 7, 7, 7, 7, 7, 7, 7, 7, 7],
[7, 7, 7, 7, 7, 7, 7, 7, 7, 7],
[8, 8, 8, 8, 8, 8, 8, 8, 8, 8],
[0, 8, 8, 8, 8, 8, 8, 8, 8, 8]], dtype=object)
val.astype(np.int32)
Out[8]:
array([[0, 2, 0, 2, 0, 2, 0, 2, 0, 2],
[0, 2, 0, 2, 0, 2, 0, 2, 0, 2],
[0, 2, 0, 2, 0, 2, 0, 2, 0, 2],
[0, 2, 0, 2, 0, 2, 0, 2, 0, 2],
[0, 2, 0, 2, 0, 2, 0, 2, 0, 2],
[0, 2, 0, 2, 0, 2, 0, 2, 0, 2],
[7, 7, 7, 7, 7, 7, 7, 7, 7, 7],
[7, 7, 7, 7, 7, 7, 7, 7, 7, 7],
[8, 8, 8, 8, 8, 8, 8, 8, 8, 8],
[0, 8, 8, 8, 8, 8, 8, 8, 8, 8]])
val.astype(np.float32)
array([[ 0., 2., 0., 2., 0., 2., 0., 2., 0., 2.],
[ 0., 2., 0., 2., 0., 2., 0., 2., 0., 2.],
[ 0., 2., 0., 2., 0., 2., 0., 2., 0., 2.],
[ 0., 2., 0., 2., 0., 2., 0., 2., 0., 2.],
[ 0., 2., 0., 2., 0., 2., 0., 2., 0., 2.],
[ 0., 2., 0., 2., 0., 2., 0., 2., 0., 2.],
[ 7., 7., 7., 7., 7., 7., 7., 7., 7., 7.],
[ 7., 7., 7., 7., 7., 7., 7., 7., 7., 7.],
[ 8., 8., 8., 8., 8., 8., 8., 8., 8., 8.],
[ 0., 8., 8., 8., 8., 8., 8., 8., 8., 8.]], dtype=float32)
val.astype(np.str)
Out[10]:
array([['0', '2', '0', '2', '0', '2', '0', '2', '0', '2'],
['0', '2', '0', '2', '0', '2', '0', '2', '0', '2'],
['0', '2', '0', '2', '0', '2', '0', '2', '0', '2'],
['0', '2', '0', '2', '0', '2', '0', '2', '0', '2'],
['0', '2', '0', '2', '0', '2', '0', '2', '0', '2'],
['0', '2', '0', '2', '0', '2', '0', '2', '0', '2'],
['7', '7', '7', '7', '7', '7', '7', '7', '7', '7'],
['7', '7', '7', '7', '7', '7', '7', '7', '7', '7'],
['8', '8', '8', '8', '8', '8', '8', '8', '8', '8'],
['0', '8', '8', '8', '8', '8', '8', '8', '8', '8']],
dtype='<U1')
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