[Rd] Evaluate part of an expression at C level

[Hugh Parsonage]

You may be trying to do something similar to hutilscpp::which_first(x < 5)
which does most of its work at the R level. That is notice an expression is
of the form lhs operator rhs then evaluate each element of lhs separately




On Fri, 27 Sep 2019 at 8:35 pm, Morgan Morgan <morgan.emailbox using gmail.com>
wrote:

> Hi,
>
> I am wondering if the below is possible?
> Let's assume I have the following expression:
>
> 1:10 < 5
>
> Is there a way at the R C API level to only evaluate the 5th element (i.e 5
> < 5) instead of evaluating the whole expression and then select the 5th
> element in the logical vector?
>
> Thank you
> Best regards
> Morgan
>
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