What meaning is '[: , None]'?

[Rustom Mody]

On Saturday, January 2, 2016 at 6:14:24 PM UTC+5:30, Robert wrote:
> Hi,
> 
> I read a code snippet, in which object w_A is:
> 
> 
> w_A
> Out[48]: array([ 0.10708809,  0.94933575,  0.8412686 ,  0.03280939,  0.59985308])
> 
> 
> Then, I don't know what is '[:  ' below:
> vs_A = w_A[:, None] * xs
> 
> 
> I don't find the answer after searching around 
> Could you explain above code to me?
> Thanks,

You probably want to search for 'slice/slicing' and 'indexing'
I get this
http://docs.scipy.org/doc/numpy-1.10.0/reference/arrays.indexing.html

[Note: I dont know much about this]