标签：nump tor ora gis port rar with res basic
The basic slice syntax is?i:j:k?where?i?is the starting index,?j?is the stopping index, and?k?is the step (). This selects the?m?elements (in the corresponding dimension) with index values?i,?i + k, ...,?i + (m - 1) k?where??and?q?and?r?are the quotient and remainder obtained by dividing?j - i?by?k:?j - i = q k + r, so that?i + (m - 1) k < j. # -*- coding: utf-8 -*-
"""
Spyder Editor
This is a temporary script file.
"""
import mxnet as mx
import numpy as np
import pickle as pkl
import time
x = mx.nd.zeros((2,3))
x[:] = 1
print x.asnumpy()
x[:,1:2] = 2
print x.asnumpy()
x[1:2,1:] = 3
print x.asnumpy()
x[1:,0:2] = mx.nd.zeros((1,2))
print x.asnumpy()
x[1,2] = 4
print x.asnumpy()
x[[0], [1, 2]] = 5
print x.asnumpy()
x[::-1, 0:2:2] = [6]
print x.asnumpy()[[1. 1. 1.]
?[1. 1. 1.]]
[[1. 2. 1.]
?[1. 2. 1.]]
[[1. 2. 1.]
?[1. 3. 3.]]
[[1. 2. 1.]
?[0. 0. 3.]]
[[1. 2. 1.]
?[0. 0. 4.]]
[[1. 5. 5.]
?[0. 0. 4.]]
[[6. 5. 5.]
?[6. 0. 4.]]
# -*- coding: utf-8 -*-
"""
Spyder Editor
This is a temporary script file.
"""
import mxnet as mx
import numpy as np
x = mx.nd.arange(12)
print x
print x[3:10:3]
print x[10:3:-3]
print x[::3]
print x[::-3][ 0. ?1. ?2. ... ?9. 10. 11.]
<NDArray 12 @cpu(0)>
[3. 6. 9.]
<NDArray 3 @cpu(0)>
[10. ?7. ?4.]
<NDArray 3 @cpu(0)>
[0. 3. 6. 9.]
<NDArray 4 @cpu(0)>
[11. ?8. ?5. ?2.]
<NDArray 4 @cpu(0)>
# -*- coding: utf-8 -*-
"""
Spyder Editor
This is a temporary script file.
"""
import mxnet as mx
import numpy as np
x = mx.nd.arange(0,6).reshape((2,3))
print x.asnumpy()
print x[1].asnumpy()
y = x[0:1]
y[:] = 2
print y
print x.asnumpy()
x = mx.nd.arange(0, 8, dtype=‘int32‘).reshape((2, 2, 2))
print x[[0, 1]]
print x[1:, [0, 1]]
y = np.array([0, 1], dtype=‘int32‘)
print x[1:, y]
y = mx.nd.array([0, 1], dtype=‘int32‘)
print x[1:, y]_register_converters
[[0. 1. 2.]
?[3. 4. 5.]]
[3. 4. 5.]
[[2. 2. 2.]]
<NDArray 1x3 @cpu(0)>
[[2. 2. 2.]
?[3. 4. 5.]]
[[[0 1]
? [2 3]]
?[[4 5]
? [6 7]]]
<NDArray 2x2x2 @cpu(0)>
[[[4 5]
? [6 7]]]
<NDArray 1x2x2 @cpu(0)>
[[[4 5]
? [6 7]]]
<NDArray 1x2x2 @cpu(0)>
[[[4 5]
? [6 7]]]
<NDArray 1x2x2 @cpu(0)>
?
?
?
?
?
==
# -*- coding: utf-8 -*-
"""
Spyder Editor
This is a temporary script file.
"""
import mxnet as mx
import numpy as np
x = mx.nd.arange(0,6).reshape(2,3)
print x
y = x.reshape(3,2)
print y
y = x.reshape(3,-1)
print y
y = x.reshape(3,2)
print y
y = x.reshape(-3)
print y
y[:] = -1
print x[[0. 1. 2.]
?[3. 4. 5.]]
<NDArray 2x3 @cpu(0)>
[[0. 1.]
?[2. 3.]
?[4. 5.]]
<NDArray 3x2 @cpu(0)>
[[0. 1.]
?[2. 3.]
?[4. 5.]]
<NDArray 3x2 @cpu(0)>
[[0. 1.]
?[2. 3.]
?[4. 5.]]
<NDArray 3x2 @cpu(0)>
[0. 1. 2. 3. 4. 5.]
<NDArray 6 @cpu(0)>
[[-1. -1. -1.]
?[-1. -1. -1.]]
<NDArray 2x3 @cpu(0)>
标签：nump tor ora gis port rar with res basic
原文地址：http://blog.51cto.com/13959448/2316501
