[R] Making an if condition variable ?

[Bert Gunter]

You need to rethink. You'll do better in the long -- and probably
short, too -- run working within the language's paradigms rather than
resisting them.

(It's not that R's paradigms are in any sense "the best"; other
languages have different paradigms and you would do better in those
languages with their paradigms rather than with R's).

For example, you could have a single function that returns the
conditional function of your choice by calling the overall function
with an appropriate keyword.  Etc.

Cheers,
Bert


Bert Gunter

"The trouble with having an open mind is that people keep coming along
and sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )


On Thu, Jun 2, 2016 at 7:50 AM, ce <zadig_1 at excite.com> wrote:
>
> well, not that simple. My original condition and changes are more complicated than I post in r-help for simplicity purposes . Original condition is something like :
>
>  if (   a > 0  & ( b[1] > b[2] ) |  c == TRUE )
>
> and I might change it to
>
> if ( a == 0 &  ( b[1] < b[2] ) & d > 10 )
>
> then I need to have a bunch of functions and I will forget which function I used.
>
> -----Original Message-----
> From: "Rainer M Krug" [Rainer at krugs.de]
> Date: 06/02/2016 09:08 AM
> To: "ce" <zadig_1 at excite.com>
> CC: "Jeff Newmiller" <jdnewmil at dcn.davis.ca.us>, r-help at r-project.org
> Subject: Re: Making an if condition variable ?
>
> "ce" <zadig_1 at excite.com> writes:
>
>> Thank you all for wisdom :)
>> Problem is that I change the condition often and then I forget it. I
>> wanted to put it at the beginning of the program with the other
>> parameters so I wouldn't miss it.
>
> In this case - why not use a function instead of the condition?
>
> cond <- function(x){x>0}
> and than
>
> if (cond(4)) {...}
>
> might be the easiest in this case?
>
> or, more flexible,
>
> cond <- function(...){x>0}
>
> if (cond(x=3)) {...}
>
> Cheers,
>
> Rainer
>
>>
>> ce
>>
>>
>> -----Original Message-----
>> From: "Rainer M Krug" [Rainer at krugs.de]
>> Date: 06/02/2016 04:00 AM
>> To: "Jeff Newmiller" <jdnewmil at dcn.davis.ca.us>
>> CC: r-help at r-project.org
>> Subject: Re: Making an if condition variable ?
>>
>> Jeff Newmiller <jdnewmil at dcn.davis.ca.us> writes:
>>
>>> Beware of getting too "meta" in your programming... it is rarely worth
>>> it. Just write the code and move on with life. That is the beauty of a
>>> scripting language.
>>
>> +1
>>
>> I think this a very common pitfall (I know it from own experience...)
>> and I would say a candidate for a fortune?
>>
>> Rainer
>
> --
> Rainer M. Krug
> email: Rainer<at>krugs<dot>de
> PGP: 0x0F52F982
>
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