[R] subsetting

[Douglas Bates]

You are most of the way to the answer when you use the word "subset". 
There is a subset function to do exactly this.  You probably want 
something like

subframe <- subset(myDataFrame, id %in% myIdSample)

Peter Hyde wrote:
> Hi!  I have never used this before, so please forgive my lack of proper
> protocol...
> 
> Would someone please tell me how to subset a dataframe?
> 
> I have a table of data with x & y (spatial) coordinates, 2 attributes
> (tree height and biomass) and a unique identification number for each
> record
> 
> i have also created an array of random numbers equal to the number of
> records in my data frame
> 
> i am trying to subset, in order to get the records that correspond to my
> unique id numbers
> 
> basically, i am trying to figure out the equivalent to the "where" command
> in IDL (which I understand is FORTRAN-like)
> 
> any insight would be greatly appreciated!!
> 
> thanks!
> 
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