Benford's Law states that the distribution of leading digits is not random. This is probably because many things grow logarithmically. Extract the leading digit from these vectors.
- 10 --> 1
- 13 --> 1
- 0.3 --> 3
- -4 --> 4
- -5 --> 5
- -0.006 --> 6
Input will be a vector
x = [1 0.3 -2 0.001 -0.0006, 582398, 3020];
Output should be
y = [1 3 2 1 6 5 3];
Solution Stats
Problem Comments
-
3 Comments
Ned Gulley
on 29 May 2012
I added some extra test cases to fail some of the bogus answers.
Iván Quintanar
on 31 Dec 2017
Amazing Law!!!!!!!!!!!!
Luyu Wang
on 6 Jul 2018
I cannot understand the problem.
Solution Comments
-
1 Comment
Fatpuss
on 14 Dec 2015
Interesting. Looks like it failed due to some rounding issue.
-
1 Comment
Swapnil Kulkarni
on 16 Jul 2015
Whats wrong here ?
-
1 Comment
Jon
on 4 Dec 2013
This appears to be the best solution that doesn't use regexp
-
1 Comment
Mineralter
on 30 Sep 2013
A good method. num2str
-
1 Comment
Konrad
on 7 Dec 2012
Sorry, I did not want to copy you! Just tried to understand what you did...
-
1 Comment
Aurelien Queffurust
on 24 Feb 2012
Doesn't work if x = 0.3000
-
1 Comment
Aurelien Queffurust
on 24 Feb 2012
The best solution n codesize for me and w/o cheating !
-
4 Comments
Show
1 older comment
Trung Duong
on 8 Feb 2012
not fun at all :-)
Peter Wittenberg
on 30 Mar 2012
bm, you have many good solutions in Cody. Why put in garbage like this?
Nigel Davies
on 29 May 2012
You have just made me sad. Sorry.
@bmtran (Bryant Tran)
on 30 May 2012
i wrote this a long time ago (on the third day of Cody). i figured that as soon as the test suite was changed, this solution would be gone with the wind. sorry to anyone i offended :(
-
1 Comment
Aurelien Queffurust
on 24 Feb 2012
Doesn't work if x = 0.3000
-
1 Comment
the cyclist
on 27 Jan 2012
Not general. Solution depends on the particular test case.
-
1 Comment
Aurelien Queffurust
on 24 Feb 2012
Doesn't work if x = 0.3000
Recent Solvers871
Suggested Problems
-
2441 Solvers
-
705 Solvers
-
1614 Solvers
-
413 Solvers
-
280 Solvers
More from this Author95
Tags
Discover what MATLAB® can do for your career.
Opportunities for recent engineering grads.
Apply Today