[Numpy-discussion] howto make from flat array (1-dim) 2-dimensional?

[David M. Cooke]

On Sun, May 13, 2007 at 02:36:39PM +0300, dmitrey wrote:
> i.e. for example from flat array [1, 2, 3] obtain
> array([[ 1.],
>        [ 2.],
>        [ 3.]])
> 
> I have numpy v 1.0.1
> Thx, D.

Use newaxis:

In [1]: a = array([1., 2., 3.])
In [2]: a
Out[2]: array([ 1.,  2.,  3.])
In [3]: a[:,newaxis]
Out[3]: 
array([[ 1.],
       [ 2.],
       [ 3.]])
In [4]: a[newaxis,:]
Out[4]: array([[ 1.,  2.,  3.]])

When newaxis is used as an index, a new axis of dimension 1 is added.

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|David M. Cooke                      http://arbutus.physics.mcmaster.ca/dmc/
|cookedm at physics.mcmaster.ca