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Groups > comp.soft-sys.math.mathematica > #2704 > unrolled thread
| Started by | Oliver Ruebenkoenig <ruebenko@wolfram.com> |
|---|---|
| First post | 2011-05-25 10:59 +0000 |
| Last post | 2011-05-25 23:33 +0000 |
| Articles | 2 — 2 participants |
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Re: Position Oliver Ruebenkoenig <ruebenko@wolfram.com> - 2011-05-25 10:59 +0000
Re: Position Armand Tamzarian <mike.honeychurch@gmail.com> - 2011-05-25 23:33 +0000
| From | Oliver Ruebenkoenig <ruebenko@wolfram.com> |
|---|---|
| Date | 2011-05-25 10:59 +0000 |
| Subject | Re: Position |
| Message-ID | <irine1$rg9$1@smc.vnet.net> |
On Wed, 25 May 2011, Joerg Schroeder wrote:
> Dear Group,
>
> I don't understand the following:
>
> I have a list of data and want to find the position of special elements:
>
> data=Table[CDF[BinomialDistribution[150,0.3],k],{k,0,150}]
>
> Position[data,#>=0.95&]
>
> With this I get {} (null set) as an answer, whereas for example Select gives the answer I expect.
>
> Select[data,#>=0.95&]
>
> Do I do something wrong with Position?
>
> Thanks
>
> Jorg Schroder
>
Joerg,
Position works like Cases:
Position[data, _?(# >= 0.95 &)]
Select[data, # >= 0.95 &]
Cases[data, _?(# >= 0.95 &)]
Oliver
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| From | Armand Tamzarian <mike.honeychurch@gmail.com> |
|---|---|
| Date | 2011-05-25 23:33 +0000 |
| Message-ID | <irk3k9$7a7$1@smc.vnet.net> |
| In reply to | #2704 |
On May 25, 8:59 pm, Oliver Ruebenkoenig <ruebe...@wolfram.com> wrote:
> On Wed, 25 May 2011, Joerg Schroeder wrote:
> > Dear Group,
>
> > I don't understand the following:
>
> > I have a list of data and want to find the position of special elements=
:
>
> > data=Table[CDF[BinomialDistribution[150,0.3],k],{k,0,150}]
>
> > Position[data,#>=0.95&]
>
> > With this I get {} (null set) as an answer, whereas for example Select =
gives the answer I expect.
>
> > Select[data,#>=0.95&]
>
> > Do I do something wrong with Position?
>
> > Thanks
>
> > Jorg Schroder
>
> Joerg,
>
> Position works like Cases:
>
> Position[data, _?(# >= 0.95 &)]
> Select[data, # >= 0.95 &]
> Cases[data, _?(# >= 0.95 &)]
>
> Oliver
Also
Position[data, x_ /; x >= 0.95]
...and so on
Mike
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