[R] Reading parameters from dataframe and loading as objects

Francois Pepin francois.pepin at sequentainc.com
Fri Nov 4 18:50:41 CET 2011


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.


François Pepin
Sequenta, Inc.
400 E. Jamie Court, Suite 301
South San Francisco, CA 94080
650 243 3929 p
francois.pepin at sequentainc.com
The contents of this e-mail message and any attachments are intended solely for the addressee(s) named in this message.  This communication is intended to be and to remain confidential and may be subject to applicable attorney/client and/or work product privileges.  If you are not the intended recipient of this message, or if this message has been addressed to you in error, please immediately alert the sender by reply e-mail and then delete this message and its attachments.  Do not deliver, distribute or copy this message and/or any attachments and if you are not the intended recipient, do not disclose the contents or take any action in reliance upon the information contained in this communication or any attachments.

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.
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.

More information about the R-help mailing list