[R] Subscripting problem with is.na()

[Ista Zahn]

Suggestion: figure out the correct extraction syntax first. One you do that
replacement will be easy.

See ?Extract for all the messy details.

Best,
Ista
On Jun 23, 2016 10:00 AM, <G.Maubach at weinwolf.de> wrote:

> Hi All,
>
> I would like to recode my NAs to 0. Using a single vector everything is
> fine.
>
> But if I use a data.frame things go wrong:
>
> -- cut --
>
> var1 <- c(1:3, NA, 5:7, NA, 9:10)
> var2 <- c(1:3, NA, 5:7, NA, 9:10)
> ds_test <-
>   data.frame(var1, var2)
>
> test <- var1
> test[is.na(test)] <- 0
> test  # NA recoded OK
>
> # First try
> ds_test[is.na(ds_test$var1)] <- 0  # duplicate subscripts WRONG
>
> # Second try
> ds_test[is.na("var1")] <- 0
> ds_test$var1  # not recoded WRONG
>
> # Third try: to me the most intuitive approach
> is.na(ds_test["var1"]) <- 0  # attempt to select less than one element in
> integerOneIndex WRONG
>
> # Fourth try
> ds_test[is.na(var1)] <- 0  # duplicate subscripts for columns WRONG
>
> -- cut --
>
> How can I do it correctly?
>
> Where could I have found something about it?
>
> Kind regards
>
> Georg
>
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