[SciPy-user] vstack / hstack question n dim array without value

Unknown pitfall66@freenet...
Tue Sep 23 07:22:48 CDT 2008


Hello I am programming this for the Machine Learning Course. I am
studying  Computer Science. 

My Question is can I somehow get rid of the "indices_buffer". Means is
there a easy way to initialize n dim arrays without values ?
I also came up with filling the array with a colum of zeros and deleting
this colum later, but not so elegant in my opinion either.


specifically this code:

indices_buffer=[]

if (indices_buffer==[]):
	indices_buffer=tmp
else:
	indices_buffer=hstack((indices_buffer,tmp))



--------------------------------------------

data 
0.3 0.4 0.4
0.2 0.1 0.3
0.3 0.2 0.4
...

cls 
1
1
2
...


def splitcrossval(data,nFold,cls):
	
	indices_buffer=[]
	(rows,columns)=data.shape
	

	classes=unique(cls)
	
	
	for i in classes:

		indices=where(cls==i)[0] 
		
		tmp=hsplit((permutation(indices)),nFold)

		if (indices_buffer==[]):
			indices_buffer=tmp
		else:
			indices_buffer=hstack((indices_buffer,tmp))
		
		
	return 	indices_buffer
	





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