Re: [Rd] The use of match.fun

[Joris Meys]

Sorry, I am being a daft idiot again.  Turns out that somehow I had an
object FUN in my global environment, which explains why I didn't get the
result I expected.

So please ignore my question and burn my mail on a stake.
Cheers
Joris

On Tue, Sep 6, 2016 at 3:35 PM, Adrian Dușa  wrote:

> I am not able to replicate this:
>
> > center <- function(x,FUN) FUN(x)
> > center(1:10, mean)
> [1] 5.5
> > mean <- 4
> > center(1:10, mean)
> Error in center(1:10, mean) : could not find function "FUN"
>
> Using a fresh install of version 3.3.1 under MacOS, and tested before with
> 3.3.0 with the same result.
>
>
> On Tue, Sep 6, 2016 at 4:25 PM, Joris Meys  wrote:
>
>> Dear gurus,
>>
>> I was utterly surprised to learn that one of my examples illustrating the
>> need of match.fun() doesn't give me the expected result.
>>
>> center <- function(x,FUN) FUN(x)
>> center(1:10, mean)
>> mean <- 4
>> center(1:10, mean)
>>
>> Used to give me the error message "could not find function FUN". Now it
>> just works, even though I didn't expect it to. I believe this is at least
>> partially linked to a change in how R finds functions.
>>
>> Now I'm not sure any more whether match.fun() actually has any use any
>> longer, and if so, in which cases it prevents things going wrong.
>>
>> I've tried to find an example where this went wrong, but couldn't find
>> one.
>> Any pointer to what happened here is greatly appreciated. I've checked the
>> NEWS, but I'm not smart enough to find the relevant bits and piece it
>> together.
>>
>> Thank you in advance
>> Cheers
>> Joris
>>
>> --
>> Joris Meys
>> Statistical consultant
>>
>> Ghent University
>> Faculty of Bioscience Engineering
>> Department of Mathematical Modelling, Statistics and Bio-Informatics
>>
>> tel :  +32 (0)9 264 61 79
>> joris.m...@ugent.be
>> ---
>> Disclaimer : http://helpdesk.ugent.be/e-maildisclaimer.php
>>
>> [[alternative HTML version deleted]]
>>
>> __
>> R-devel@r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-devel
>>
>
>
>
> --
> Adrian Dusa
> University of Bucharest
> Romanian Social Data Archive
> Soseaua Panduri nr.90
> 050663 Bucharest sector 5
> Romania
>



-- 
Joris Meys
Statistical consultant

Ghent University
Faculty of Bioscience Engineering
Department of Mathematical Modelling, Statistics and Bio-Informatics

tel :  +32 (0)9 264 61 79
joris.m...@ugent.be
---
Disclaimer : http://helpdesk.ugent.be/e-maildisclaimer.php

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Re: [Rd] The use of match.fun

[Adrian Dușa]

I am not able to replicate this:

> center <- function(x,FUN) FUN(x)
> center(1:10, mean)
[1] 5.5
> mean <- 4
> center(1:10, mean)
Error in center(1:10, mean) : could not find function "FUN"

Using a fresh install of version 3.3.1 under MacOS, and tested before with
3.3.0 with the same result.


On Tue, Sep 6, 2016 at 4:25 PM, Joris Meys  wrote:

> Dear gurus,
>
> I was utterly surprised to learn that one of my examples illustrating the
> need of match.fun() doesn't give me the expected result.
>
> center <- function(x,FUN) FUN(x)
> center(1:10, mean)
> mean <- 4
> center(1:10, mean)
>
> Used to give me the error message "could not find function FUN". Now it
> just works, even though I didn't expect it to. I believe this is at least
> partially linked to a change in how R finds functions.
>
> Now I'm not sure any more whether match.fun() actually has any use any
> longer, and if so, in which cases it prevents things going wrong.
>
> I've tried to find an example where this went wrong, but couldn't find one.
> Any pointer to what happened here is greatly appreciated. I've checked the
> NEWS, but I'm not smart enough to find the relevant bits and piece it
> together.
>
> Thank you in advance
> Cheers
> Joris
>
> --
> Joris Meys
> Statistical consultant
>
> Ghent University
> Faculty of Bioscience Engineering
> Department of Mathematical Modelling, Statistics and Bio-Informatics
>
> tel :  +32 (0)9 264 61 79
> joris.m...@ugent.be
> ---
> Disclaimer : http://helpdesk.ugent.be/e-maildisclaimer.php
>
> [[alternative HTML version deleted]]
>
> __
> R-devel@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
>



-- 
Adrian Dusa
University of Bucharest
Romanian Social Data Archive
Soseaua Panduri nr.90
050663 Bucharest sector 5
Romania

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[Rd] The use of match.fun

[Joris Meys]

Dear gurus,

I was utterly surprised to learn that one of my examples illustrating the
need of match.fun() doesn't give me the expected result.

center <- function(x,FUN) FUN(x)
center(1:10, mean)
mean <- 4
center(1:10, mean)

Used to give me the error message "could not find function FUN". Now it
just works, even though I didn't expect it to. I believe this is at least
partially linked to a change in how R finds functions.

Now I'm not sure any more whether match.fun() actually has any use any
longer, and if so, in which cases it prevents things going wrong.

I've tried to find an example where this went wrong, but couldn't find one.
Any pointer to what happened here is greatly appreciated. I've checked the
NEWS, but I'm not smart enough to find the relevant bits and piece it
together.

Thank you in advance
Cheers
Joris

-- 
Joris Meys
Statistical consultant

Ghent University
Faculty of Bioscience Engineering
Department of Mathematical Modelling, Statistics and Bio-Informatics

tel :  +32 (0)9 264 61 79
joris.m...@ugent.be
---
Disclaimer : http://helpdesk.ugent.be/e-maildisclaimer.php

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