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Reading parameters from dataframe and loading as objects

4 messages · Aher, Eric Lecoutre, Francois Pepin +1 more

Aher
# 
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?


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Francois Pepin
# 
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.

Cheers,

Fran?ois 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:

            

      
      
      
    

        

      
      
    

  
  


  


      

    

    

      
      

        


  

        

      David Winsemius
    

    

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

        

            

      
      
      
    

        
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.