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From "Niall Pemberton (JIRA)" <j...@apache.org>
Subject [jira] Created: (MATH-181) Specify the maximum of digits when parsing a Fraction
Date Wed, 23 Jan 2008 01:54:34 GMT
Specify the maximum of digits when parsing a Fraction
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                 Key: MATH-181
                 URL: https://issues.apache.org/jira/browse/MATH-181
             Project: Commons Math
          Issue Type: Improvement
    Affects Versions: 1.1
            Reporter: Niall Pemberton
            Priority: Minor
         Attachments: MATH-181-FractionDigitsLimit.patch

Firstly, thanks for the Fraction code - I've adapated it for something I'm working on and
I didn't have a clue how to convert a decimal to a fraction :)

Excel spreadsheets have the facility to specify a fraction format where you specify the maximum
number of denominator digits to display.

So for example:
    format "?/?" displays decimal values formatted in the range 1/2 to n/9
    format "??/??" displays decimal values formatted in the range 1/2 to n/99
    format "???/???" displays decimal values formatted in the range 1/2 to n/999 etc

In excel then the value 0.6152 displays as 3/5, 8/13 and 510/829 respectively for the above
3 formats.

I'm attaching a patch for the Fraction class which adds a new constructor where the maximum
number of digits can be specified, rather than the epsilon value.

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