[Insight-developers] Iterator vs IteratorWithIndex

[Stephen R. Aylward]

To make a more realistic test, I merely converted one of our image 
intensity windowing filters to use IteratorWithIndex instead of 
Iterator.  This way the cost of the index can be considered with respect 
to the cost of simple addition and multiplication at every pixel...

Iterator for intensity windowing (secs)
	Single Processor: 5.7
	Dual Processor:   3.6
IteratorWithIndex for intensity windowing (secs)
	Single Processor: 6.4
	Dual Processor:   4.1

So - in the "grand scheme of things" using IteratorWithIndex is only 
about 12% slower.

Percent change calculated as (6.4-5.7)/5.7 * 100

Stephen

-- 
===============================================
Dr. Stephen R. Aylward
Assistant Professor of Radiology
Adjunct Assistant Professor of Computer Science
http://caddlab.rad.unc.edu
aylward@unc.edu
(919) 966-9695