array manipulation-

[Aram Ter-Sarkissov]

hi, this is probably a very silly question, but I can't get my hear
around it unfortunately(

I have an array (say, mat=rand(3,5)) from which I 'pull out' a row
(say, s1=mat[1,]). The problem is, the shape of this row s1 is not
[1,5], as I would expect, but rather [5,], which means that I can't,
for example, concateante mat and s1 rowwise.

thanks for the help

 

[Robert Kern]

hi, this is probably a very silly question, but I can't get my hear
around it unfortunately(

I have an array (say, mat=rand(3,5)) from which I 'pull out' a row
(say, s1=mat[1,]). The problem is, the shape of this row s1 is not
[1,5], as I would expect, but rather [5,], which means that I can't,
for example, concateante mat and s1 rowwise.

thanks for the help

You can ask numpy questions on the numpy mailing list.

http://www.scipy.org/Mailing_Lists

--
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
that is made terrible by our own mad attempt to interpret it as though it had
an underlying truth."
-- Umberto Eco

 

[Gregory Ewing]

I have an array (say, mat=rand(3,5)) from which I 'pull out' a row
(say, s1=mat[1,]). The problem is, the shape of this row s1 is not
[1,5], as I would expect, but rather [5,], which means that I can't,
for example, concateante mat and s1 rowwise.

Use a 2D slice:

>>> a = array([[1,2],[3,4]])
>>> a

array([[1, 2],
[3, 4]])

>>> b = a[1:2,:]
>>> b

array([[3, 4]])
(1, 2)