[R] Assigning & function to variable

[Rainer M Krug]

Prof Brian Ripley <ripley at stats.ox.ac.uk> writes:

> On 21/02/2014 10:07, Rainer M Krug wrote:
>> Hi
>>
>> I want to assign the function & and | to a variable, because I want to
>> specify as a function argument if inside the function & or | should be
>> used.
>>
>>    link <- &
>>
>> does not work, and
>>
>>    link <- "&"
>>
>> results in the string "&" being assigned to link.
>
> Use backticks: see ?Quotes.
>
> link <- `&`
>

Thanks - that works perfectly.

> You can also make use of .Primitive.
>
>> So how can I assign the logical function to the variable link, so that I
>> can do
>>
>> TRUE link FALSE
>
> Are you trying to ask how to make 'link' into a binary operator?  You
> cannot: user-defined binary operators are of the form %link% .

Initially I wanted,  but using the form link(x, y) makes the argument
more powerful as user defined functions can be supplied which return
logical vectors.

Thanks a lot,

Rainer

>
>
>>
>> Thanks,
>>
>> Rainer
>>
>>
>>
>>
>> ______________________________________________
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>> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>

-- 
Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation Biology, UCT), Dipl. Phys. (Germany)

Centre of Excellence for Invasion Biology
Stellenbosch University
South Africa

Tel :       +33 - (0)9 53 10 27 44
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email:      Rainer at krugs.de

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