[R] getting started, reading listing and saving data

[Thomas Schönhoff]

Hi,

2005/11/23, Ronnie Babigumira <r.babigumira at gmail.com>:
> Thomas many thanks,  though str(myobject[ 5:9]) is not what I want, it
> prompted me to try head(myobject [3:4]) and this gets me really close
> to what I want, I get the first few observations of variables 3 and 4
> in my data. What I would like to do however is to do the same thing
> but with the variable names explicitly (so instead of 3:4 I use
> something like varname3 and varname4)
>
> Any ideas
>
> Again, many thanks to all on the list who have helped (I promise I am
> frantically trying to read up everything I have been given and bring
> myself upto speed so I will not be consuming bandwidth with a lot of
> read the manual sort of questions)
>
>
>
> On 11/23/05, Thomas Schönhoff <tschoenhoff at gmail.com> wrote:
> > Hello,
> >
> > 2005/11/23, Ronnie Babigumira <r.babigumira at gmail.com>:
> > > Many thanks to Peter Alspach, Jim Porzak and Murray Pung for the help.
> > > Peter and Jim, head? and tail? was just what I needed to list a few
> > > observations. Peter, thanks for pointing out str? to me. I totally
> > > agree with you on its usefulness.
> > >
> > > Murray thanks for file > save workspace (and Peters save.image)
> > > addresses the third of my concerns
> > >
> > > One last question related to head and tails, this works best if you
> > > have a few variables (columns). Given more, how can I use the
> > > information on the variable names given after str to list the first
> > > few few observations for a set of variable.
> > >
> > > To make it clear. Say I load a dataset with n variables named v1 to
> > > vn. I use str(mydata) and I get a list of variable names..
> > >
> > > str(x)
> > > v1 ......
> > > .  ......
> > > .  ......
> > > .  ......
> > > .  ......
> > > Vn ......
> > >
> > > How do i list the first n observations of say v5 to v9
> >
> > Not sure if this is what you are looking for: str(myobject[ 5:9])

myobservs  <-str(myobject, myobject$v5[1:n],...,...,... myobject$9[1:n])

where n = number of observations to be selected.

Hmm, not sure if this works for your object (data.frame, matrix,
multi-dimensional array?). Would be much easier to know more about
your object!

regards

Thomas