[Numpy-discussion] concatenate a tuple of lists 10x slower in numpy 1.0.1

[Travis Oliphant]

Martin Spacek wrote:
> Hello,
>
> I just upgraded from numpy 1.0b5 to 1.0.1, and I noticed that a part of
> my code that was using concatenate() was suddenly far slower. I
> downgraded to 1.0, and the slowdown disappeared. Here's the code
> and the profiler results for 1.0 and 1.0.1:
>   

I have not heard of this before.  I cannot think what might have caused 
it. 

-Travis