Software Venture Consulting

FileMaker Pro downloads & Resources
FileMaker Custom Functions
FileMaker Web Viewer Examples
FileMaker Pro & Lasso Consulting
Training
FileMaker Books
FileMaker Articles
FileMaker Error Reference

Free Web Tools
Free FileMaker Tools

Personal Pages
Videos
Adventures
Links

Shopping Cart
Shopping Cart

Search:

Free Newsletter
Signup


Contact


Privacy Policy



FileMaker is a registered trademark of FileMaker, Inc. in the U.S. and other countries.

 

 FileMaker Pro Custom Functions

List  |  Show Random  |  Upload  |  Add This to Your Site

ConvertFractToNum ( number )

Rate this function:  

RatingRatingRatingRatingRating
  Average rating: 4.5  (32 votes)
  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

Make a comment about this Custom Function (please try to keep it brief & to the point). Anyone can post:

Your Name:
City/Location:
Comment:
characters left. If you paste in more than 1500 characters, it will be truncated. Discuss the function - advertisements and other useless posts will be deleted.
Answer 6 + 5 =
Search for Custom Functions:

Custom Functions Widget
Download the Custom Function Dashboard Widget for OS X
Keep all the latest Custom Functions right at your fingertips!

Newest Custom Functions:

1. HexUUIDToNum_cf (_uuid)
  (Sat, Jun 16, 1:55pm)
2. httpResponseCode ( responseHeaders )
  (Tue, Jun 12, 10:40pm)
3. FindDuplicateCharacters ( string )
  (Fri, Jun 08, 5:01pm)
4. FieldRepetitionLast ( field ; maxRepetition )
  (Wed, Jun 06, 6:05pm)
5. CountModifiedRecords ( NameTimestampField ; StartTimestamp ; EndTimestamp )
  (Mon, May 28, 8:23am)
6. JSONArrayLength ( JSONArrayStr )
  (Fri, May 25, 7:46am)
7. interpolation (y1; y2; y3; x1; x2; x3; x1y1; x2y1; x1y2; x2y2; rnd)
  (Sat, May 19, 3:55am)
8. @JSONFormatElements ( json )
  (Tue, May 15, 3:31am)

RSS Feed of Custom Functions