From: McGehee, Robert <Robert.McGehee_at_geodecapital.com>

Date: Fri 10 Jun 2005 - 04:10:22 EST

R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Fri Jun 10 04:24:13 2005

Date: Fri 10 Jun 2005 - 04:10:22 EST

*> df1 <- data.frame(a = c(NA, 0, 3, 4))
**> df2 <- data.frame(a = c(NA, 0, 0, 4))
*

> df1[df1 == 0] <- 2 ## Works

> df2[df2 == 0] <- 2

Error: NAs are not allowed in subscripted assignments

Checking an old news file I see this:

o Subassignments involving NAs and with a replacement value of length > 1 are now disallowed. (They were handled inconsistently in R < 2.0.0, see PR#7210.) For data frames they are disallowed altogether, even for logical matrix indices (the only case which used to work).

which leaves me to believe that the assignment for both df1 and df2 should fail ("data frame ... disallowed altogether"), however that seems not to be the case, since the example works for df1. Also, the vectorized version works as expected (because the replacement value has a length of 1).

*> vec1 <- c(NA, 0, 3, 4)
**> vec2 <- c(NA, 0, 0, 4)
*

> vec1[vec1 == 0] <- 2 ## Works

> vec2[vec2 == 0] <- 2 ## Also works

Best,

Robert

Robert McGehee

Quantitative Analyst

Geode Capital Management, LLC

53 State Street, 5th Floor | Boston, MA | 02109
Tel: 617/392-8396 Fax:617/476-6389

mailto:robert.mcgehee@geodecapital.com

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R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Fri Jun 10 04:24:13 2005

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