From: Michael Sc <michael.schatzow@...>
Date: 2007-02-07T21:03:17+09:00
Subject: Re: Beginner questions: sorting csv files

on the daily return, I wanted to define two if statements so that two 
columns had to equal in order to do take the percantage change function. 
Does anyone have any ideas on this?
I tried to do this. Thanks again for the help.

0.upto( a.size - 2 ) {|i|
 (a[i][1]==a[i+1][1] and a[i][2]==a[i+1][2]) (a[i+1][3] - a[i][3]) / 
a[i][3] * 100}

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