From: Vincent Fourmond <vincent.fourmond@9online.fr>
Date: 2006-12-22T06:55:36+09:00
Subject: Re: prob with each_with_index

shawn bright wrote:
> lo there all,
> 
> i am having a problem making each_with_index do what i need it to do.
> the issue is...
> 
> i need to evaluate the gpm of a flow sensor.
> we are skipping over three database entries to get the values.
> difference in value / difference in time = gpm. ok, easy enough.
> 
> but this code
> 
> @flow_sensor.flow_hits.each_with_index do |hit, i|
>          if i > 4 # start with 3rd hit in db
  No, you're starting with the 5th !!

  Index are zero-based, to you need i >= 2 to get the third one.

	Vince

-- 
Vincent Fourmond, PhD student
http://vincent.fourmond.neuf.fr/