R help - Nov 2011 - Reading parameters from dataframe and loading as objects

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.

Hi,

Did you program in SAS previously? :)

You don't really want data.frame but a named list (note that data frames
are lists but for columns).


mypars <- as.list(value)
names(mypars) <- param
mypars$max_pct

If you really want to use data.frame you can assign rownames and access
parameters through:

datapars <- data.frame(value=value)
rownames(datapars) <- param
datapars["max_pct","value"]

But this really seems more complicated way ins't it?

HTH

Eric


On 4 November 2011 07:24, Aher <ajit.aher@cedar-consulting.com> 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@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<http://www.r-project.org/posting-guide.html>
> and provide commented, minimal, self-contained, reproducible code.
>


-- 
Eric Lecoutre
Consultant - Business & Decision
Business Intelligence & Customer Intelligence

	[[alternative HTML version deleted]]

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
 
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.