On Sep 6, 2010, at 9:22 PM, tooblue wrote:
I simply put,
NEVER=subset(infants$bwt,ISNO1)
UNTILPREGNANT=subset(infants$bwt, ISNO2)
ONCENOTNOW=subset(infants$bwt, ISNO3)
and I wanna combine those three.
I do it like
ISNO=NEVER&UNTILPREGNANT&ONCENOTNOW
The "&" operator does not do concatenation, but rather returns a
logical vector. You may have had your mind adversely affected by
excessive exposure to Excel.
Hopefully you did not do just that at the command line. I could
imagine thinking that might work as part of the subset argument to
subset, but it would be through the use of the or operator, "|":
ALL <- subset(infants$bwt, ISNO1| ISNO2| ISNO3)
If they were dataframes, you could also have done:
ALL <- rbind(NEVER, UNTILPREGNANT, ONCENOTNOW)
But below you suggested they might be vectors; if so, why not:
ALL <- c(NEVER, UNTILPREGNANT, ONCENOTNOW)
and R tells me
1: In NEVER & UNTILPREGNANT :
longer object length is not a multiple of shorter object length
2: In NEVER & UNTILPREGNANT & ONCENOTNOW :
longer object length is not a multiple of shorter object length
I'm confused coz these are not objects, but a list of sets of numbers.
They really _must_ be objects since you assigned a result to those
names.
(Greater clarity would occur if you offered at least str(NEVER)
--
David Winsemius, MD
West Hartford, CT
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