Attempting to recode elements contained in a list
On Wed, 24 Aug 2005, Greg Blevins wrote:
Hello R-Masters, I have a list 's' with three elements, as shown below. I want to recode a.a, a.a2, and a.a3 to NA if the value in a.a is less than 3.
I think s is a data frame, and you are looking at its printout. There is almost certainly no element a.a. Rather, the data frame has a column a, which is probably a matrix with three columns, a, a2 and a3. Use str(s) to be sure. Here is an attempt to create a similar object
s <- data.frame(scan=letters[1:3], time=LETTERS[1:3])
s$a <- array(runif(9)*6, dim=c(3,3), dimnames=list(NULL, c("a", "a2",
"a3")))
s
scan time a.a a.a2 a.a3 1 a A 5.435430 1.283933 1.546180 2 b B 5.169964 2.519836 1.568225 3 c C 3.844045 2.318089 0.772869 If that is the case, you need s$a[s$a[, "a"] < 3, ] <- NA
I reivewed my Modern Applied Statistic Book, the online help and did some searching of R-help on the internet. I explored unlist and as.list.data.frame in an attempt to isolate the third element of the list s, but this was not helpful. Any help would be appreciated.
dim(s)
[1] 342 3
names(s)
[1] "scan" "time" "a"
s
scan time a.a a.a2 a.a3 202 Plastic lids Plastic lids NaN NaN NaN 195 Plastic lids Cookware lids 44 31 58 205 Plastic lids Seasoning packets 9 4 20 191 Plastic lids Baking sheets 15 7 27 209 Plastic lids Utensils 9 4 20 194 Plastic lids Cell phones 0 0 7 193 Plastic lids Canned goods 0 0 7 197 Plastic lids Hand/dish towel 3 0 12 Thank you. Greg Blevins The Market Solutions Group Windows xp, 2.1.1 Gregory L. Blevins Vice President, Partner The Market Solutions Group, Inc. gblevins at marketsolutionsgroup.com Office phone: 612 392-3163 Cell phone: 612 251-0232 "What is at the beginning but a small error, swells to huge proportions at the close." Aristotle
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