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

ShannonEntropy ( text )

Rate this function:  

RatingRatingRatingRatingRating
  Average rating: 4.3  (3 votes)
  Discuss this Custom Function

Richard Dyce, Dyce & Sons Ltd.
http://dyce.com

A function for calculating the entropy of a string - how difficult is it to encode.

Sample Input:
ShannonEntropy ( "aaaaaa" )

ShannonEntropy ( "aaaabb" )

ShannonEntropy ( "abcdefg" )

ShannonEntropy ( "This is some text. It is very long" )

Sample Output:
0

.9182958340544895

2.8073549220576048

3.7958114600475881


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

Click here to copy To Clip Manager if you have myFMbutler's Clip Manager installed

Description:

The Shannon Entropy is the minimal number of bits per symbol needed to encode the information in binary form. It's a good rule of thumb measure of how strong your password is ;-)

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 seems to reference two custom functions. I can find one by the same author on this site, but I can’t find one for “ApplyToList”. If the author sees this, please provide references to the appropriate subroutines. This would be very useful for me, but I can’t get it to work.

Thanks!

Peter Gerlings, Amsterdam
January 01, 2018 11:02am

The ApplyToList() function is the standard function by Debi Fuchs: http://www.briandunning.com/cf/899

Richard Dyce, Elgin
January 01, 2018 12:00pm

Thanks!

Peter Gerlings, Amsterdam
January 07, 2018 2:52pm

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 4 + 7 =
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. CompareVersions ( versionA ; versionB )
  (Wed, Jan 17, 1:23pm)
2. WorkingDateList (StartDate;EndDate;HolidayList)
  (Fri, Jan 12, 9:30am)
3. _cf_Returns.Drawdown ( PeriodCount ; IncomingArray ; DrawdownSoFar ; MaxDrawdown ; Type )
  (Wed, Jan 10, 8:08pm)
4. LastMonth_withYear ( Date2Process )
  (Wed, Jan 10, 10:46am)
5. list.ToSqlIn ( theList )
  (Sun, Jan 07, 7:29am)
6. fnValidMBI ( MBI )
  (Sat, Jan 06, 10:29am)
7. mapJoin(pre; sep; post; str; i; values)
  (Fri, Jan 05, 11:48am)
8. CheckDigit_swissUID ( swissUID )
  (Thu, Jan 04, 6:06am)

RSS Feed of Custom Functions