[R] Operator proposal: %between%

[Torbjørn Lindahl]

I don't mind maintaining this, however I'm not creating a new util package
just for one function, there are already several nice util libraries out
there, adding one more adds to fragmentation more than this single function
provides usefulness.

If anyone wants to adopt this low-maintenance-cost love child, that would
be the best option. If this is something, worthy of R-Core I'd be happy to
submit it, but from the sound of it that door seems closed. I think %>%
etc. also should go there, they look great and would make everyday life
simpler, almost enjoyable.

Also some of the point of this function is keeping it as an operator, that
provides better readability and mental flow.

Looks like all variations of between shown could easily be merged into one
cover-it-all operator

T.


On Fri, Sep 5, 2014 at 10:36 AM, Gabor Grothendieck <ggrothendieck at gmail.com
> wrote:

> On Thu, Sep 4, 2014 at 10:41 AM, Torbjørn Lindahl
> <torbjorn.lindahl at gmail.com> wrote:
> > Not sure if this is the proper list to propose changes like this, if it
> > passes constructive criticism, it would like to have a %between% operator
> > in the R language.
> >
>
> There is a between function in the data.table package.
>
> > library(data.table)
> > between
> function (x, lower, upper, incbounds = TRUE)
> {
>     if (incbounds)
>         x >= lower & x <= upper
>     else x > lower & x < upper
> }
>
> and also in the tis package which works differently:
>
> > library(tis)
> > between
> function (y, x1, x2)
> {
>     y <- unclass(y)
>     x1 <- unclass(x1)
>     x2 <- unclass(x2)
>     small <- pmin(x1, x2)
>     large <- pmax(x1, x2)
>     (y >= small) & (y <= large)
> }
>
> In addition, SQL has a between operator
>
> > library(sqldf)
> > sqldf("select * from BOD where Time between 3 and 5")
>   Time demand
> 1    3   19.0
> 2    4   16.0
> 3    5   15.6
>



-- 
mvh
Torbjørn Lindahl

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