Às 14:52 de 28/10/2022, Sergei Ko escreveu:
Hi All,
Just noticed that R returns results for non-existent name if you have
another variable with the same beginning when you subset with $.
See the code below:
name_0 <- "ID"
name_1 <- "name"
name_2 <- "name1"
v0 <- 1:200
v1 <- c(rep(0,100), rep(1,100))
v2 <- c(rep(0,50), rep(1,150))
df <- as.data.frame(cbind(v0, v1, v2))
colnames(df) <- c(name_0, name_1, name_2)
df_1 <- df[, c(name_0, name_1)]
df_2 <- df[, c(name_0, name_2)]
table(df$name)
table(df_1$name)
table(df_2$name)
colnames(df_2)[2] <- "name10"
table(df_2$name)
colnames(df_2)[2] <- "name_any"
table(df_2$name)
table(df_2[,"name"])
The last row produces an error as intended.
Any ideas?
Win 10
R version 4.2.1 (2022-06-23 ucrt) -- "Funny-Looking Kid"
Regards,
Sergiy
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Hello,
This behavior, partial matching of column or list members names when
extracting with `$` is practically a FAQ.
See the latest R-Help thread on it after the release of R 4.0
https://stat.ethz.ch/pipermail/r-help/2020-May/467143.html
Hope this helps,
Rui Barradas
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