[R] Reading parameters from dataframe and loading as objects

[David Winsemius]

On Nov 4, 2011, at 1:50 PM, "Francois Pepin" <francois.pepin at sequentainc.com> wrote:

> Hi,
> 
> assign is your friend here:
> apply(data,1,function(x)assign(x[1],x[2],envir = .GlobalEnv))
> 
> As a note, you probably don't want to use data as a variable because it overwrites the data function, leading to unwanted side-effects if you ever use it.

While it is true that using "data" as an object name is a bad choice, the specific reason offered is incorrect. Functions are kept in a different list from other named objects and creating a "data" data.frame will NOT overwrite the data function.

-- 
David.

> 
> Cheers,
> 
> François Pepin
> Scientist
> 
> Sequenta, Inc.
> 400 E. Jamie Court, Suite 301
> South San Francisco, CA 94080
> 
> 650 243 3929 p
> 
> francois.pepin at sequentainc.com
> www.sequentainc.com
> 
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> 
> On Nov 3, 2011, at 23:24 , Aher wrote:
> 
>> Hi List,
>> 
>> I want to read several parameters from data frame and load them as object
>> into R session, Is there any package or function in R for this?? 
>> 
>> Here is example
>> 
>> param <-c("clust_num", "minsamp_size", "maxsamp_size", "min_pct", "max_pct") 
>> value <-c(15, 20000, 200000, 0.001, .999) 
>> data <- data.frame ( cbind(param , value))
>> data
>>        param       value
>> 1    clust_num     15
>> 2 minsamp_size    20000
>> 3 maxsamp_size   2e+05
>> 4      min_pct      0.001
>> 5      max_pct     0.999
>> 
>> My data contains many such parameters, I need to read each parameter and its
>> value from the data and load it as objects  in R session as below:
>> 
>> clust_num  <-   15
>> minsamp_size  <-20000
>> maxsamp_size <-2e+05
>> min_pct <-0.001
>> max_pct <-0.999
>> 
>> The way right now I am doing it is as creating as many variables as
>> parameters in the data frame and one observation for value of each
>> parameter.  
>> example:
>> clust_num    minsamp_size    maxsamp_size    min_pct    max_pct
>> 15    20000    200000    0.001    0.999
>> 
>> data$ clust_num  , data$minsamp_size,  .....
>> 
>> Is there any better way for doing this?
>> 
>> 
>> --
>> View this message in context: http://r.789695.n4.nabble.com/Reading-parameters-from-dataframe-and-loading-as-objects-tp3989150p3989150.html
>> Sent from the R help mailing list archive at Nabble.com.
>> 
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> 
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