[英]NumPy - reshaping an array to 1-D
I am having problems converting a NumPy array into a 1-D. 我在将NumPy阵列转换为1-D时遇到问题。 I looked into ideas I found on SO, but the problem persists.
我查看了我在SO上发现的想法,但问题仍然存在。
nu = np.reshape(np.dot(prior.T, randn(d)), -1)
print 'nu1', str(nu.shape)
print nu
nu = nu.ravel()
print 'nu2', str(nu.shape)
print nu
nu = nu.flatten()
print 'nu3', str(nu.shape)
print nu
nu = nu.reshape(d)
print 'nu4', str(nu.shape)
print nu
The code produces the following output: 代码生成以下输出:
nu1 (1, 200)
[[-0.0174428 -0.01855013 ... 0.01137508 0.00577147]]
nu2 (1, 200)
[[-0.0174428 -0.01855013 ... 0.01137508 0.00577147]]
nu3 (1, 200)
[[-0.0174428 -0.01855013 ... 0.01137508 0.00577147]]
nu4 (1, 200)
[[-0.0174428 -0.01855013 ... 0.01137508 0.00577147]]
What do you think might be the problem? 您认为可能是什么问题? What mistake I am doing?
我在做什么错?
EDIT: prior is (200,200), d is 200. I want to get 1-D array: [-0.0174428 -0.01855013 ... 0.01137508 0.00577147] of size (200,). 编辑:先前是(200,200),d是200.我想获得1-D数组:[-0.0174428 -0.01855013 ... 0.01137508 0.00577147]大小(200,)。 d is 200.
d是200。
EDIT2: Also randn is from numpy.random (from numpy.random import randn) EDIT2:randn也来自numpy.random(来自numpy.random import randn)
Your prior
is most likely a np.matrix
which is a subclass of ndarray
. 你
prior
是最有可能是np.matrix
是的子类ndarray
。 np.matrix
s are always 2D. np.matrix
总是2D。 So nu
is a np.matrix
and is 2D as well. 所以
nu
是一个np.matrix
,也是2D。
To make it 1D
, first convert it to a regular ndarray
: 要使它成为
1D
,首先将其转换为常规的ndarray
:
nu = np.asarray(nu)
For example, 例如,
In [47]: prior = np.matrix(np.random.random((200,200)))
In [48]: d = 200
In [49]: nu = np.reshape(np.dot(prior.T, randn(d)), -1)
In [50]: type(nu)
Out[50]: numpy.matrixlib.defmatrix.matrix
In [51]: nu.shape
Out[51]: (1, 200)
In [52]: nu.ravel().shape
Out[52]: (1, 200)
But if you make nu
an ndarray: 但是如果你让
nu
成为一个ndarray:
In [55]: nu = np.asarray(nu)
In [56]: nu.ravel().shape
Out[56]: (200,)
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