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Re: Position

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  Re: Position DrMajorBob <btreat1@austin.rr.com> - 2011-05-25 23:31 +0000

#2708 — Re: Position

Position's second argument should be a pattern, not a test.

A test can be turned into a pattern, on the other hand:

Position[data, x_/;x >= .95]

or

Position[data, x_?(x >= .95&)]

Bobby

On Wed, 25 May 2011 04:54:45 -0500, Joerg Schroeder  
<sd-gymwalsrode@gmx.de> 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


-- 
DrMajorBob@yahoo.com

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