This was a change in tidyr 0.7.0 that is causing a lot of confusion,
so we are preparing tidyr 0.7.1 which will back this change out.

If you want a work around in the meantime, you can express your
operation a bit more elegantly as:

library(tidyr)

df <- data.frame(v1 = 1:5, somestring = 6:10, v3 = 11:15, v4 = 16:20)
df %>%
  gather(key = var, value = val, somestring:ncol(df)) %>%
  head(2)

Hadley

On Thu, Aug 24, 2017 at 6:32 AM, Eugeny Melamud
<eugeny.mela...@lanit-tercom.com> wrote:
> Hi all!
>
> The following code (executed in console)...
>     somevar <- data.frame(v1 = 1:5, somestring = 6:10, v3 = 11:15, v4 = 
> 16:20);
>     somevar %>% gather(key = var, value = val, which(names(somevar) == 
> "somestring"):length(somevar)) %>% head(2);
> throws...
>     Error in which(names(somevar) == "somestring") :
>       could not find function "which"
>
> if I change which(names(somevar) == "somestring") with 0 I'll get
>    Error in length(somevar) :
>       could not find function "length"
>
> So it looks like base package is not loaded. Still if type 'which' in console 
> I get
>   function (x, arr.ind = FALSE, useNames = TRUE)
>   {
>     wh <- .Internal(which(x))
>     if (arr.ind && !is.null(d <- dim(x)))
>         arrayInd(wh, d, dimnames(x), useNames = useNames)
>     else wh
>   }
>   <bytecode: 0x0000000006c6e258>
>   <environment: namespace:base>
>
> base (that contains which function) package is installed. R version is 3.4.1 
> and system is Win8
>
> Where should I look to understand how to fix the problem?
>
> Thank you in advance!
> Eugeny
>
>
>         [[alternative HTML version deleted]]
>
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-- 
http://hadley.nz

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