[BioC] function handle in R

[Javier Pérez Florido]

Thanks Vincent,
do.call works!
All the best,
Javier


Vincent Carey escribió:
> use "get"
>
> e.g., if "myexpresso" is the string naming a function then
> get("myexpresso") evaluates to the function and
> get("myexpresso")(...) is valid R applying that function to ...
>
> do.call("myexpresso", list(...)) is also relevant
>
> [note that i have not followed your whole correspondence ... but for
> the question posed in this email, get() is your solution]
>
> 2010/2/6 Javier Pérez Florido <jpflorido at gmail.com>:
>   
>> Thanks Wolfgang and Arunava,
>>
>> What I would like to do is the following:
>> I have the following character vector:
>> functionsUsed=c("myexpresso","mythreestep","myvsnrma","myl.farms","myjustPlier","mymmgmos","myexp.farms","myrma","mymas5","myq.farms")
>>
>> For each component in this vector, I have a function defined:
>> myexpresso<-function(rawData,<otherarguments>),
>> mythreestep<-function(rawData,<otherarguments>), etc
>>
>> From a file, I read a 'listOfFunctions' character vector of unknown length.
>> This vector contains names like the ones given in functionsUsed vector:
>> "myexpresso", "myvsnrma", etc.... Let's say,
>> listOfFunctions=c("mythreestep","myvsnrma","mythreestep","mymas5","myexpresso","myexpresso")
>>
>> I would like to call the functions related to this vector:
>>
>>   for(i in 1:length(listOfFunctions)
>>   {
>>       currentFunction=listOfFunctions[i]:
>>       eset<-currentFunction(rawData,<otherarguments>)
>>    }
>>
>> The problem is that currentFunction is a character string, not a function
>> and I cannot convert this character string to an object of function class.
>>
>> I can proceed with if/then/else blocks, but I think there must be a smart
>> way to do this.
>>
>> Thanks again,
>> Javier
>>
>>
>>
>>
>> Wolfgang Huber escribió:
>>     
>>> Dear Javier
>>>
>>> Functions in R are just variables like everyone else, so you can simply
>>> write:
>>>  handleFunction=function1 or
>>>  handleFunction=function2 etc.
>>>
>>> Have a look into the book by Robert Gentleman
>>> http://www.bioconductor.org/pub/RBioinf
>>> or the online introduction to R
>>> http://cran.r-project.org/doc/manuals/R-intro.html
>>> esp. chapter 10. This might save you a lot of time.
>>>
>>>    Best wishes
>>>    Wolfgang
>>>
>>> Javier Pérez Florido wrote:
>>>       
>>>> Dear list,
>>>> Is there any way to use function handle in R? I would like to do
>>>> something like this (is written in MATLAB)
>>>>
>>>> handleFunction=@function1;
>>>> handleFunction(arguments) # MATLAB knows that handleFunction is related
>>>> to function1
>>>>
>>>> Thus, handleFunction can be any function, for example:
>>>> handleFunction=@function1 or handleFunction=@function2 or
>>>> handleFunction=@function3, etc
>>>>
>>>> the function call is always the same
>>>> handleFunction(arguments)
>>>>
>>>> Any ideas?
>>>> Thanks,
>>>> Javier
>>>>
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>>>>         
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>>
>>     
>
>