Re: Re: Select Maximum Value
- To: mathgroup at smc.vnet.net
- Subject: [mg107977] Re: [mg107948] Re: Select Maximum Value
- From: DrMajorBob <btreat1 at austin.rr.com>
- Date: Thu, 4 Mar 2010 05:29:08 -0500 (EST)
- References: <201003020836.DAA03985@smc.vnet.net> <hmj274$eeo$1@smc.vnet.net>
- Reply-to: drmajorbob at yahoo.com
First of all,
A={{1,2},{2,1},{3,4}},{{1,5},{2,1},{3,2}}...
isn't an array. Or anything else.
Secondly, if I set
a = {{{1, 2}, {2, 1}, {3, 4}}, {{1, 5}, {2, 1}, {3, 2}}};
a // MatrixForm
(eliminating "..." and adding the first and last missing brackets),
MatrixForm shows that a is a 3-dimensional matrix, and the second column
is a list of pairs.
Specifically, the second column is
a[[All, 2]]
{{2, 1}, {2, 1}}
Now, then... how do you want to choose a maximum in that column?
Bobby
On Wed, 03 Mar 2010 04:54:02 -0600, graser <graser at gmail.com> wrote:
> On Mar 2, 8:01 am, Patrick Scheibe <psche... at trm.uni-leipzig.de>
> wrote:
>> Hi,
>>
>> it is simply
>>
>> A = {{2, 4, 1, 3, 2, 2}, {4, 7, 9, 1, 2, 4}};
>>
>> Max /@ A
>>
>> and your code is not working at all.
>>
>> Cheers
>> Patrick
>>
>> Am Mar 2, 2010 um 9:36 AM schrieb graser:
>>
>>
>>
>> > Hi
>>
>> > I want to pick up the maximum value of each list in the Array
>>
>> > A={{2, 4, 1, 3, 2, 2}, {4,7,9,1,2,4}}
>>
>> > I can do it in two steps..
>>
>> > B=Table[Sort[A[[i]], #1>#2&], {i, 1, Length[A]}];
>>
>> > C=Table[B[i], {i, 1, Length[B]}];
>>
>> > But is there any way I can do it in just one step with Select function
>> > or any thing else?
>>
>> > Thanks
>
> Thanks for all of your comments..
>
> Here I have more question for you..
>
> If Array has
>
> A={{1,2},{2,1},{3,4}},{{1,5},{2,1},{3,2}}..
>
> Then If I want to pick up the list which has maximum value in second
> column, So my result should be {{3,4},{1,5}}, can I still use the Max?
>
> It just give the maximum value in first column like {4,5}
>
> Or I have to use the multiple steps like
>
> B = Table[Sort[A[[i]], #1[[2]] > #2[[2]] &], {i, 1, Length[A]}];
> CD = Table[B[[i, 1]], {i, 1, Length[B]}];
>
--
DrMajorBob at yahoo.com
- References:
- Select Maximum Value
- From: graser <graser@gmail.com>
- Select Maximum Value