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

[Benjamin Dickgiesser]

Thx for the help, sorry I am just used to use && from php and simply
assumed it would work identically.

On 1/9/07, Patrick Burns <pburns at pburns.seanet.com> wrote:
> S Poetry (and other documentation) will tell you
> the difference between '&&' and '&'.
>
> Patrick Burns
> patrick at burns-stat.com
> +44 (0)20 8525 0696
> http://www.burns-stat.com
> (home of S Poetry and "A Guide for the Unwilling S User")
>
> Benjamin Dickgiesser wrote:
>
> >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$DdtdAbs
> >
> >would return.
> >
> >Is there a ways around this?
> >Benjamin
> >
> >On 1/9/07, Benjamin Dickgiesser <dickgiesser at gmail.com> wrote:
> >
> >
> >>Hi all,
> >>
> >>why doesn't something like this does not work?
> >>
> >>speedy <-
> >>        (sdata$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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> >
> >
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