[SciPy-user] Adding new columns to 2D array & populating them

Tim Gray tgray@protozoic....
Fri Jun 6 12:15:53 CDT 2008

So what is the difference between the c_ operator and hstack?  Or r_ and vstack?  I'm not too clear on the c_ and r_ operators.  Is there an efficiency gain related to using them?  Do the do something special?

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