[triangle-zpug] why is this using a lot of memory?

[Chris Calloway]

On 3/25/2008 11:59 AM, Joseph Mack NA3T wrote:
> thanks both of you. Will go lookup xrange()

In addition to the memory-conserving xrange, you don't need the loop. 
This will do the same thing:

 >>> sum(xrange(10000000))
49999995000000L
 >>>

I thought this was slow. So I tried doing this with scipy.weave.inline.

See:

http://incm.cnrs-mrs.fr/LaurentPerrinet/ScientificPython#head-4f78ccfcc91b87436966e15a294263dbcd400a7e

for a pretty similar example.

But ironically it was much slower, as the C++ took so long to compile on 
the fly. Plus, you need memory, as you need to pass a populated numpy 
array to the C++ instead of a Python iterator. Python wins!

I had no problem with the original example, I guess because I have 
enough memory.

Man, some days I waste a lot of time on brain teasers.

-- 
Sincerely,

Chris Calloway
http://www.secoora.org
office: 332 Chapman Hall   phone: (919) 599-3530
mail: Campus Box #3300, UNC-CH, Chapel Hill, NC 27599