[R] for loop

[Matevž Pavlič]

Just one more thing...
I get a list with 15 data.frames :

List of 15
 $ 1:'data.frame':      7 obs. of  9 variables:
  ..$ vrtina         : Factor w/ 6 levels "T1A-1","T1A-2",..: 1 1 2 2 5 5 5
  ..$ globina.meritve: num [1:7] 7.6 8.5 10.4 17.4 12.5 15.5 16.5
  ..$ E0             : num [1:7] 4109 2533 491 810 2374 ...
  ..$ Eur1           : num [1:7] 6194 4713 605 1473 NA ...
  ..$ Eur2           : num [1:7] 3665 7216 266 4794 7387 ...
  ..$ Eur3           : num [1:7] 3221 3545 920 3347 6768 ...
  ..$ H              : num [1:7] 8 5.9 5.9 6.9 9.3 10.9 10
  ..$ Mpl            : num [1:7] 61.9 136.7 19.9 96.4 178.5 ...
  ..$ class          : int [1:7] 1 1 1 1 1 1 1
.
.
.

But how would I acces them (i.e. to draw a plot for each data.frame for each data.frame in a list)?

Thanks,m

-----Original Message-----
From: David Winsemius [mailto:dwinsemius at comcast.net] 
Sent: Saturday, October 30, 2010 8:24 PM
To: Matevž Pavlič
Cc: r-help at r-project.org
Subject: Re: [R] for loop


On Oct 30, 2010, at 2:07 PM, Matevž Pavlič wrote:

> Hi,
>
> I know this is probalby a very trivial thing to do for most of the R 
> users, but since I just strated using it I have some problems....
>
> I have a data.frame with a field called "razred". This field has 
> values from 1 up to 15.
>
> Is it possible to create a for loop that would create a new data frame 
> for each of the "razred" values.

The R-way would be to use the split function and leave the result in a list to which the same operation could be also repeatedly performed using lapply.

?split

And take a look at the fourth example applying split to the builtin airquality dataframe.

The plyr package also provides functions on dataframes.

-- 

David Winsemius, MD
West Hartford, CT