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

[Benjamin Dickgiesser]

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