MATLAB Central Newsreader - position of the max value in a vector

position of the max value in a vector

lars Man — Sun, 04 May 2008 11:50:05 -0400

Hi all,
my problem is. I got a coulmn vector out of a calculation
with about 10000 rows.
Now i want to know WHERE the maximum value is.

For example:
v= [1; 2; 3; 4; 3; 8; 3];
max(v)

8

but how can I get the position from the max. Here for
example it shoud be 6 (cause of the positon of the max
value. It ist 6).
But i don't know to get it.

Thanks for help

Re: position of the max value in a vector

Lars — Sun, 04 May 2008 12:22:02 -0400

>> help find

Re: position of the max value in a vector

John D'Errico — Sun, 04 May 2008 12:54:04 -0400

"lars Man" <larsman@gmx.net> wrote in message
<fvk7td$ofp$1@fred.mathworks.com>...
> Hi all,
> my problem is. I got a coulmn vector out of a calculation
> with about 10000 rows.
> Now i want to know WHERE the maximum value is.
>
> For example:
> v= [1; 2; 3; 4; 3; 8; 3];
> max(v)
>
> 8
>
>
> but how can I get the position from the max. Here for
> example it shoud be 6 (cause of the positon of the max
> value. It ist 6).
> But i don't know to get it.
>
> Thanks for help

help max

Re: position of the max value in a vector

dpb — Sun, 04 May 2008 13:15:39 -0400

lars Man wrote:
...

> Now i want to know WHERE the maximum value is.
>
> For example:
> v= [1; 2; 3; 4; 3; 8; 3];
> max(v)
>
> 8

doc max

--

Re: position of the max value in a vector

Image Analyst — Sun, 04 May 2008 14:05:07 -0400

Re: position of the max value in a vector

dpb — Sun, 04 May 2008 14:09:33 -0400

Image Analyst wrote:
> "lars Man" <larsman@gmx.net> wrote in message
...
>> but how can I get the position from the max.
...
> How about something like:
> indexOfMaxValue = find(v==max(v));

or

[vmax, idx] = max(v);

:)

(max() does return only the first of multiples whereas find() will
return the vector, of course, if that is wanted/needed...)

--

Re: position of the max value in a vector

CandyGirl — Sun, 04 May 2008 17:52:21 -0400

Hi,

If you want the index try:

[maxval, maxind]=max(a)

:)

Re: position of the max value in a vector

aasim Azooz — Mon, 05 May 2008 18:13:02 -0400

"Lars " <mustermann.klaus.TO.REMOVE@gmx.de> wrote in
message <fvk9pa$9cv$1@fred.mathworks.com>...
> >> help find
use
[x,i]=max(A)
x is the maximum value of your vector
i is the index of where the maximum value was found. for
more information type
>> help max

Aasim Azooz
Mosul University
Mosul Iraq

Re: position of the max value in a vector

lars Man — Tue, 06 May 2008 19:49:02 -0400

Thanks a lot to all!!!!!

Re: position of the max value in a vector

lars Man — Tue, 06 May 2008 19:49:03 -0400

Thanks a lot to all!!!!!

Re: position of the max value in a vector

lars Man — Tue, 06 May 2008 19:49:03 -0400

Thanks a lot to all!!!!!

Re: position of the max value in a vector

lars Man — Tue, 06 May 2008 19:50:20 -0400

Thanks a lot to all!!!!!

Re: position of the max value in a vector

lars Man — Tue, 06 May 2008 19:50:20 -0400

Thanks a lot to all!!!!!

Re: position of the max value in a vector

lars Man — Tue, 06 May 2008 19:50:20 -0400

Thanks a lot to all. It works!