[R] unexpected 'else' in " else"

[Andrew Simmons]

The error comes from the expression not being wrapped with braces. You
could change it to

if (is.matrix(r)) {
    r[w != 0, , drop = FALSE]
} else r[w != 0]

or

{
    if (is.matrix(r))
        r[w != 0, , drop = FALSE]
    else r[w != 0]
}

or

if (is.matrix(r)) r[w != 0, , drop = FALSE] else r[w != 0]


On Fri., Oct. 21, 2022, 05:29 Jinsong Zhao, <jszhao using yeah.net> wrote:

> Hi there,
>
> The following code would cause R error:
>
>  > w <- 1:5
>  > r <- 1:5
>  >         if (is.matrix(r))
> +             r[w != 0, , drop = FALSE]
>  >         else r[w != 0]
> Error: unexpected 'else' in "        else"
>
> However, the code:
>          if (is.matrix(r))
>              r[w != 0, , drop = FALSE]
>          else r[w != 0]
> is extracted from stats::weighted.residuals.
>
> My question is why the code in the function does not cause error?
>
> Best,
> Jinsong
>
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