Drexel dragonThe Math ForumDonate to the Math Forum



Search All of the Math Forum:

Views expressed in these public forums are not endorsed by Drexel University or The Math Forum.


Math Forum » Discussions » Software » comp.soft-sys.matlab

Topic: second largest element in a matrix
Replies: 32   Last Post: May 5, 2013 10:31 AM

Advanced Search

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]
mike zander

Posts: 3,542
Registered: 11/29/05
Re: second largest element in a matrix
Posted: Apr 3, 2009 7:58 PM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

"Paul " <pswirhun@comcast.net> wrote in message
> if temp is your vector, you can get the second largest element as follows:
>
> [c,i] = max(temp(temp~=max(temp)))
> why would you sort it?
> this is the whole point of logical addressing in matlab.




% Some Data
temp = [8 -1 0 1 2 -3 -8 0 5 -4]

% Proposed method
[c,i] = max(temp(temp~=max(temp)));

% As a check:
[srt,idx] = sort(temp,'descend');
idx2 = find(srt~=srt(1),1);
secondhighest = srt(idx2);
location = idx(idx2);

% isequal?
[secondhighest==c,location==i]


Have I misunderstood your proposal?


Date Subject Author
9/18/08
Read second largest element in a matrix
Oluwa KuIse
9/19/08
Read Re: second largest element in a matrix
stephanie
9/19/08
Read Re: second largest element in a matrix
Steven Lord
9/19/08
Read Re: second largest element in a matrix
Oluwa KuIse
9/19/08
Read Re: second largest element in a matrix
Pekka
9/19/08
Read Re: second largest element in a matrix
Oluwa KuIse
9/21/08
Read Re: second largest element in a matrix
Greg Heath
9/24/08
Read Re: second largest element in a matrix
Walter Roberson
3/4/09
Read Re: second largest element in a matrix
Justin
4/6/09
Read Re: second largest element in a matrix
Bruno Luong
4/6/09
Read Re: second largest element in a matrix
Jos
4/6/09
Read Re: second largest element in a matrix
Bruno Luong
4/6/09
Read Re: second largest element in a matrix
Bruno Luong
4/6/09
Read Re: second largest element in a matrix
mike zander
4/7/09
Read Re: second largest element in a matrix
Bruno Luong
4/7/09
Read Re: second largest element in a matrix
Bruno Luong
4/3/09
Read Re: second largest element in a matrix
Paul
11/7/12
Read Re: second largest element in a matrix
sssbi2009@gmail.com
11/19/12
Read Re: second largest element in a matrix
dpb
4/3/09
Read Re: second largest element in a matrix
Paul
4/3/09
Read Re: second largest element in a matrix
mike zander
4/3/09
Read Re: second largest element in a matrix
mike zander
4/3/09
Read Re: second largest element in a matrix
mike zander
4/3/09
Read Re: second largest element in a matrix
Walter Roberson
4/3/09
Read Re: second largest element in a matrix
mike zander
5/4/13
Read Re: second largest element in a matrix
tilindg1@gmail.com
5/4/13
Read Re: second largest element in a matrix
Nasser Abbasi
5/4/13
Read Re: second largest element in a matrix
dpb
5/5/13
Read Re: second largest element in a matrix
Nasser Abbasi
5/5/13
Read Re: second largest element in a matrix
dpb
5/5/13
Read Re: second largest element in a matrix
Bruno Luong
5/5/13
Read Re: second largest element in a matrix
Nasser Abbasi
5/5/13
Read Re: second largest element in a matrix
Bruno Luong

Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© Drexel University 1994-2014. All Rights Reserved.
The Math Forum is a research and educational enterprise of the Drexel University School of Education.