Re: [R] Logical operations or selecting data from data.frames

From: Johan Sandblom <johan.sandblom_at_ki.se>
Date: Tue 09 Jan 2007 - 17:56:16 GMT

Is the solution this simple?

sdata$VaR < sdata$DdtdAbs & sdata$DdtdDuration >= 1

Regards, Johan

2007/1/9, Benjamin Dickgiesser <dickgiesser@gmail.com>:
> I suppose this doesn't work for the same reason as
> sdata$VaR < sdata$DdtdAbs && sdata$DdtdDuration >= 1
>
> does only return FALSE and not a vector of TRUE and FALSE as
>
> sdata$VaR < sdata$DdtdAbs
>
> would return.
>
> Is there a ways around this?
> Benjamin
>
> On 1/9/07, Benjamin Dickgiesser <dickgiesser@gmail.com> wrote:
> > Hi all,
> >
> > why doesn't something like this does not work?
> >
> > speedy <-
> > (sdata$VaR < sdata$DdtdAbs) && sdata$DdtdDuration >= qpois(pct,lambda) &&
> > sdata$Ddtd > MinDD
> >
> > or sdata$Ddtd[sdata$Ddtd > 0 && sdata$VaR < sdata$DdtdAbs]
> >
> > sdata looks like this:
> >
> > dataId date value Ddtd VaR DdtdAbs DdtdDuration
> > 18948 79637 2004-07-27 10085.10 NA NA 0.00 0
> > 18949 79638 2004-07-28 10117.10 NA NA 0.00 0
> > 18950 79639 2004-07-29 10129.20 NA NA 0.00 0
> > 18951 79640 2004-07-30 10139.70 NA NA 0.00 0
> > 18952 79641 2004-08-02 10179.20 NA NA 0.00 0
> > 18953 79642 2004-08-03 10120.20 0.579613329 336.060090 59.00 1
> > 18954 79643 2004-08-04 10126.50 NA NA 0.00 0
> > 18955 79644 2004-08-05 9963.03 1.614279366 334.306978 163.47 1
> > 18956 79645 2004-08-06 9815.33 3.072828717 386.173057 311.17 2
> > 18957 79646 2004-08-09 9814.66 3.079445020 420.167049 311.84 3
> > 18958 79647 2004-08-10 9944.67 NA NA 0.00 0
> > 18959 79648 2004-08-11 9938.32 0.063853300 328.315992 6.35 1
> > 18960 79649 2004-08-12 9814.59 1.308037371 379.182568 130.08 2
> >
> > I am trying to select rows from the data.frame which have Ddtd > x,
> > VaR < DdtdAbs and DdtdDuration > z.
> >
> > Thank you,
> > Benjamin
> >
>
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>

-- 
Johan Sandblom  N8, MRC, Karolinska sjh
t +46851776108  17176 Stockholm
m +46735521477  Sweden
"What is wanted is not the will to believe, but the
will to find out, which is the exact opposite"
- Bertrand Russell

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Received on Wed Jan 10 08:43:23 2007

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