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: 5.0  (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:

There are no comments yet. Be the first to post 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 5 + 2 =
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. FixedFieldConverter ( Fieldname ; f1 ; f2 ; f3 ; f4 ; f5 ; f6 ; f7 ; f8 ; f9 ; f10 ; f11 ; f12 ; f13 ; f14 ; f15 ; f16 ; f17 ; f18 ; f1
  (Fri, Sep 15, 12:34pm)
2. ShannonEntropy ( text )
  (Thu, Sep 07, 5:59am)
3. LetterCount ( text ; summary )
  (Thu, Sep 07, 5:53am)
4. ExactPatternCount ( text ; searchString )
  (Thu, Sep 07, 5:45am)
5. CopyMoveFile ( ~OriginalFilePath ; ~EndFilePath ; ~MacServerPath ; ~PCServerPath ; ~MoveOrCopy )
  (Tue, Sep 05, 6:44pm)
6. SHEXEC ( CMD ; STDIN; PARM )
  (Sun, Sep 03, 8:34am)
7. EOF ( RC ; STDIN )
  (Sun, Sep 03, 8:25am)
8. ListSort ( ValueList )
  (Mon, Aug 21, 11:04am)

RSS Feed of Custom Functions