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FileMaker Pro Custom Functions

ConvertFractToNum ( number )

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Discuss this Custom Function

Colin Keefe, IT Solutions Consulting, Inc
http://itsolutions-inc.com

Converts a fraction to a real number.

Sample Input:
 ConvertFractToNum(5 1/2)
Sample Output:
 5.5

Then copy & paste into FileMaker Advanced's Edit Custom Function window.

Description:

I've been using Mikhail Edoshin's Fraction() custom function for awhile now - it's great. (see: http://edoshin.skeletonkey.com/)

For a particular application, I needed a method to convert user-entered fractions back into a real number, so I could perform math on it, so I wrote this up to complement Mikhail's function. Feed it a fraction, and it'll do its level best to produce a real number.

There's some room for improvement here in terms of error capture, but much of that could be handled at field-level validation, to prevent malformed fractions from being entered.

Note: these functions are not guaranteed or supported by BrianDunning.com. Please contact the individual developer with any questions or problems.

This is my Custom Function and I want to edit it

Discuss:

This is handy, but doesn't correctly handle fractions without a space (e.g. "1/2"). I've modified it a bit:

Let ( [
\$number = Trim(number);
\$integer = LeftWords(\$number;1);
\$denominator = Right ( \$number ; Length(\$number)-Position(\$number; "/";1;1 ));
\$numerator = Middle ( \$number ; Position ( \$number ; " "; 1 ; 1 ) ; Position ( \$number ; "/"; 1 ; 1 )-Position ( \$number ; " "; 1 ; 1 ) )
];

Case(
// no slash, so no fraction
PatternCount(\$number;"/")=0;\$number;

// no space, so no valid fraction
PatternCount(\$number;" ")=0;\$numerator/\$denominator;

// too many spaces, so no valid fraction
PatternCount(\$number;" ")>1;\$number;

// - we have a fraction to parse
\$integer + (\$numerator/\$denominator)
)
)

Sam Barnum, 360Works
November 16, 2010 11:48am

Is there a way to use this with negative fractions? Say I have -2 4/8
right now it returns 2.5 when i would like it to return -2.5

Any help would be appreciated.

Thanks!

Matt, Calgary
August 16, 2012 10:14pm