From: Michael Sc <michael.schatzow@...>
Date: 2007-02-08T20:30:02+09:00
Subject: Re: Beginner questions: sorting csv files

Michael Sc wrote:
> 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}

Also, Does anyone have any recommendations about books that have a large 
discussion of ruby for math purposes?

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