LISTS: Extract every other element - SUMMARY

[Christian Tismer]

Mike Fletcher wrote:

Here I see a problem:
>                         for x in range(5):
>                                 t = time.clock()
>                                 function( data )
>                                 avg.append( time.clock()-t )
>                         print '%s %.4f'%(function, reduce( lambda x,y: x+y,

The timing must be outside the loop.
Better adjust the loop with a clear run.
But calls into windows cause much uncertaincy,
better avoid them.

I run all my stuff in a small apply loop which is
adjusted against a dry run with apply(len) counted as 0.

def timing(func, args=None, n=1, **keywords) :
	import time
	time=time.time
	appl=apply
	if args is None: args = ()
	if type(args) != type(()) : args=(args,)
	rep=range(n)
	dummyarg = ("",)
	dummykw = {}
	dummyfunc = len
	if keywords:
		before=time()
		for i in rep: res=appl(dummyfunc, dummyarg, dummykw)
		empty = time()-before
		before=time()
		for i in rep: res=appl(func, args, keywords)
	else:
		before=time()
		for i in rep: res=appl(dummyfunc, dummyarg)
		empty = time()-before
		before=time()
		for i in rep: res=appl(func, args)
	after = time()
	return round(after-before-empty,4), res

ciao - chris

-- 
Christian Tismer             :^)   <mailto:tismer at appliedbiometrics.com>
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