[Numpy-discussion] make hstack and vstack promote 1-D argument to 2-D when necessary

Dr. Phillip M. Feldman pfeldman@verizon....
Mon Nov 23 18:43:23 CST 2009


I opened ticket #1302 to make the following enhancement request:

I'd like to see hstack and vstack promote 1-D arguments to 2-D when this is
necessary to make the dimensions match.  In the following example, c_ works
as expected while hstack does not:

[~]|8> x
   <8>
array([[1, 2, 3],
       [4, 5, 6],
       [7, 8, 9]])
[~]|9> y
   <9> array([10, 11, 12])
[~]|10> c_[x,y]
   <10>
array([[ 1,  2,  3, 10],
       [ 4,  5,  6, 11],
       [ 7,  8,  9, 12]])
[~]|11> x
   <11>
array([[1, 2, 3],
       [4, 5, 6],
       [7, 8, 9]])
[~]|12> y
   <12> array([10, 11, 12])
[~]|13> hstack((x,y))
---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)

\<ipython console> in <module>()

C:\Program Files\Python25\lib\site-packages\numpy\lib\shape_base.pyc in
hstack(tup)
    503
    504     """
--> 505     return _nx.concatenate(map(atleast_1d,tup),1)
    506
    507 row_stack = vstack

ValueError: arrays must have same number of dimensions
-- 
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