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devel / comp.lang.python / Request for argmax(list) and argmin(list)

SubjectAuthor
* Request for argmax(list) and argmin(list)ABCCDE921
+- Re: Request for argmax(list) and argmin(list)Paul Rubin
+* Re: Request for argmax(list) and argmin(list)Paul Bryan
|`* Re: Request for argmax(list) and argmin(list)ABCCDE921
| +- Re: Request for argmax(list) and argmin(list)Calvin Spealman
| `- Re: Request for argmax(list) and argmin(list)Dan Stromberg
`- Re: Request for argmax(list) and argmin(list)Peter Otten

1
Request for argmax(list) and argmin(list)

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Subject: Request for argmax(list) and argmin(list)
From: atharvasakhala5445@gmail.com (ABCCDE921)
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 by: ABCCDE921 - Wed, 1 Sep 2021 04:25 UTC

I dont want to import numpy

argmax(list)
returns index of (left most) max element

argmin(list)
returns index of (left most) min element

Re: Request for argmax(list) and argmin(list)

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Subject: Re: Request for argmax(list) and argmin(list)
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 by: Paul Rubin - Wed, 1 Sep 2021 04:33 UTC

ABCCDE921 <atharvasakhala5445@gmail.com> writes:
> argmax(list)
> returns index of (left most) max element

Does this work?

def argmax(lst):
i,x = max(enumerate(xs), key=lambda a: a[1])
return i

Re: Request for argmax(list) and argmin(list)

<mailman.555.1630477931.4164.python-list@python.org>

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Subject: Re: Request for argmax(list) and argmin(list)
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 by: Paul Bryan - Wed, 1 Sep 2021 06:32 UTC

Why not:

>>> l = [1, 3, 5, 9, 2, 7]
>>> l.index(max(l))
3 >>> l.index(min(l))
0

On Tue, 2021-08-31 at 21:25 -0700, ABCCDE921 wrote:
> I dont want to import numpy
>
> argmax(list)
>    returns index of (left most) max element
>
>  argmin(list)
>    returns index of (left most) min element

Re: Request for argmax(list) and argmin(list)

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Subject: Re: Request for argmax(list) and argmin(list)
From: atharvasakhala5445@gmail.com (ABCCDE921)
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 by: ABCCDE921 - Wed, 1 Sep 2021 07:20 UTC

Because that does 2 passes over the entire array when you only need one and there is no option to specify if you want the leftmost or rightmost element

On Wednesday, September 1, 2021 at 12:02:29 PM UTC+5:30, Paul Bryan wrote:
> Why not:
>
> >>> l = [1, 3, 5, 9, 2, 7]
> >>> l.index(max(l))
> 3
> >>> l.index(min(l))
> 0
> On Tue, 2021-08-31 at 21:25 -0700, ABCCDE921 wrote:
> > I dont want to import numpy
> >
> > argmax(list)
> > returns index of (left most) max element
> >
> > argmin(list)
> > returns index of (left most) min element

Re: Request for argmax(list) and argmin(list)

<mailman.556.1630481791.4164.python-list@python.org>

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Subject: Re: Request for argmax(list) and argmin(list)
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 by: Peter Otten - Wed, 1 Sep 2021 07:21 UTC

On 01/09/2021 06:25, ABCCDE921 wrote:
> I dont want to import numpy
>
> argmax(list)
> returns index of (left most) max element

>>> import operator
>>> second = operator.itemgetter(1)
>>> def argmax(values):
return max(enumerate(values), key=second)[0]

>>> argmax([1, 2, 3, 0])
2

> argmin(list)
> returns index of (left most) min element

This is left as an exercise;)

Re: Request for argmax(list) and argmin(list)

<mailman.560.1630507611.4164.python-list@python.org>

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Subject: Re: Request for argmax(list) and argmin(list)
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 by: Calvin Spealman - Wed, 1 Sep 2021 14:46 UTC

If only there were a library that already provides exactly the functions
you're asking for... 🤔

On Wed, Sep 1, 2021 at 9:54 AM ABCCDE921 <atharvasakhala5445@gmail.com>
wrote:

> Because that does 2 passes over the entire array when you only need one
> and there is no option to specify if you want the leftmost or rightmost
> element
>
>
> On Wednesday, September 1, 2021 at 12:02:29 PM UTC+5:30, Paul Bryan wrote:
> > Why not:
> >
> > >>> l = [1, 3, 5, 9, 2, 7]
> > >>> l.index(max(l))
> > 3
> > >>> l.index(min(l))
> > 0
> > On Tue, 2021-08-31 at 21:25 -0700, ABCCDE921 wrote:
> > > I dont want to import numpy
> > >
> > > argmax(list)
> > > returns index of (left most) max element
> > >
> > > argmin(list)
> > > returns index of (left most) min element
> --
> https://mail.python.org/mailman/listinfo/python-list
>
>

--

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Re: Request for argmax(list) and argmin(list)

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Subject: Re: Request for argmax(list) and argmin(list)
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 by: Dan Stromberg - Thu, 2 Sep 2021 22:14 UTC

How about this?:

python3 -c 'list_ = [1, 3, 5, 4, 2]; am = max((value, index) for index,
value in enumerate(list_)); print(am)'

On Wed, Sep 1, 2021 at 6:51 AM ABCCDE921 <atharvasakhala5445@gmail.com>
wrote:

> Because that does 2 passes over the entire array when you only need one
> and there is no option to specify if you want the leftmost or rightmost
> element
>
>
> On Wednesday, September 1, 2021 at 12:02:29 PM UTC+5:30, Paul Bryan wrote:
> > Why not:
> >
> > >>> l = [1, 3, 5, 9, 2, 7]
> > >>> l.index(max(l))
> > 3
> > >>> l.index(min(l))
> > 0
> > On Tue, 2021-08-31 at 21:25 -0700, ABCCDE921 wrote:
> > > I dont want to import numpy
> > >
> > > argmax(list)
> > > returns index of (left most) max element
> > >
> > > argmin(list)
> > > returns index of (left most) min element
> --
> https://mail.python.org/mailman/listinfo/python-list
>

devel / comp.lang.python / Request for argmax(list) and argmin(list)

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