great! Thanks

On Sun, Sep 5, 2010 at 9:31 PM, Joshua Wiley <jwiley.psych@gmail.com> wrote:

> On Sun, Sep 5, 2010 at 8:36 AM, rajesh j <akshay.rajesh@gmail.com> wrote:
> > No, the examples dont cover it...if i have
> > dat <- list(INT = c("1","2","3"),
> >             NUM = c("2.34","4.56","6.78"),
> >             INT = c("4", "5", "6"),
> >             NUM = c("3.44"))
> >
> > I need to do a which on INT[0],NUM[0],INT[0] and NUM[0]...ie the [0]
> index
> > of all the vectors...
> > and test if they hold a value
>
> Ah, alright in which case:
>
> lapply(dat, function(x) {x[1] == "4"})
>
> This lapply()s the little test x[1] == "4" to each element in the list
> 'dat'.  I am using the [1] index because there is no [0] in R.
>
> >
> > On Sun, Sep 5, 2010 at 9:03 PM, Joshua Wiley <jwiley.psych@gmail.com>
> wrote:
> >>
> >> On Sun, Sep 5, 2010 at 8:16 AM, rajesh j <akshay.rajesh@gmail.com>
> wrote:
> >> > Hi,
> >> > in a way similar to names(dat), can I address a particular index of
> >> > every
> >> > vector?
> >> > like [0] of all the vectors? So that I could do something like,
> >> > ints<-which(<required usage>=="x")
> >>
> >> Not sure I follow you exactly, but you can use which() with any
> >> logical test.  Take a look at these examples, are any of them what you
> >> mean?
> >>
> >> example(which)
> >>
> >> If so (or even before) it would be worth it to read through
> >>
> >> ?which
> >>
> >> >
> >> > On Sun, Sep 5, 2010 at 8:34 PM, Joshua Wiley <jwiley.psych@gmail.com>
> >> > wrote:
> >> >>
> >> >> Hi Rajesh,
> >> >>
> >> >> This will work, unfortunately it seems like lapply() drops the names
> >> >> before it passes each element of the list which lead to my clumsy
> work
> >> >> around using which().  I'm sure there are other ways.
> >> >>
> >> >> dat <- list(INT = c("1","2","3"),
> >> >>            NUM = c("2.34","4.56","6.78"),
> >> >>            INT = c("4", "5", "6"),
> >> >>            NUM = c("3.44"))
> >> >>
> >> >> ints <- which(names(dat)=="INT")
> >> >> nums <- which(names(dat)=="NUM")
> >> >>
> >> >> dat[ints] <- lapply(dat[ints], as.integer)
> >> >> dat[nums] <- lapply(dat[nums], as.numeric)
> >> >>
> >> >> str(dat)
> >> >>
> >> >> Cheers,
> >> >>
> >> >> Josh
> >> >>
> >> >> On Sun, Sep 5, 2010 at 6:33 AM, rajesh j <akshay.rajesh@gmail.com>
> >> >> wrote:
> >> >> > The string vector actually comes as a part of a list, and the
> vector
> >> >> > is
> >> >> > named "int", and the numbers are strings. I then have to make it a
> >> >> > vector
> >> >> > that is still called "int" and has 4,5,6 etc. the types are either
> >> >> > integer
> >> >> > or numeric. The number of items in the vector is unknown.
> >> >> >
> >> >> > here's an example,
> >> >> >
> >> >> > a list has vectors
> >> >> >
> >> >> > INT
> >> >> > "2"
> >> >> > "3"
> >> >> > "4"
> >> >> >
> >> >> > NUM
> >> >> > "2.37"
> >> >> > "4.56"
> >> >> >
> >> >> >
> >> >> >
> >> >> > On Sun, Sep 5, 2010 at 6:56 PM, David Winsemius
> >> >> > <dwinsemius@comcast.net>wrote:
> >> >> >
> >> >> >>
> >> >> >> On Sep 5, 2010, at 9:22 AM, rajesh j wrote:
> >> >> >>
> >> >> >> for e.g., I get the following as a string vector
> >> >> >> "int" "4" "5" "6"
> >> >> >> after reading the first element, I have to convert this to a
> integer
> >> >> >> vector
> >> >> >>
> >> >> >>
> >> >> >>
> >> >> >> But what is the right answer?  And what number of items are
> possble
> >> >> >> per
> >> >> >> line?  And what are the other possible type identifiers? We need
> an
> >> >> >> example
> >> >> >> that has enough complexity to allow testing.
> >> >> >>
> >> >> >> --
> >> >> >> David.
> >> >> >>
> >> >> >>
> >> >> >>
> >> >> >> On Sun, Sep 5, 2010 at 6:44 PM, David Winsemius
> >> >> >> <dwinsemius@comcast.net>wrote:
> >> >> >>
> >> >> >>>
> >> >> >>> On Sep 5, 2010, at 8:48 AM, rajesh j wrote:
> >> >> >>>
> >> >> >>>  Hi,
> >> >> >>>>
> >> >> >>>> Is it possible to convert a string vector to integer or numeric
> >> >> >>>> vector?
> >> >> >>>> In
> >> >> >>>> my situation I receive data in a string vector and have to
> convert
> >> >> >>>> it
> >> >> >>>> based
> >> >> >>>> on a given type.
> >> >> >>>>
> >> >> >>>
> >> >> >>> Can you give an example? I don't understand either what sort of
> >> >> >>> conversion
> >> >> >>> you desire or what you mean by "convert it based on a given
> type."
> >> >> >>>
> >> >> >>> There are a couple of function you may want to consider but I am
> >> >> >>> having
> >> >> >>> difficulty convincing myself they answer the problem posed:
> >> >> >>>
> >> >> >>> ?charToRaw
> >> >> >>> ?stroi
> >> >> >>>
> >> >> >>> > strtoi(charToRaw("123 this is a string"), base=16)   # convert
> to
> >> >> >>> decimal ASCII
> >> >> >>>  [1]  49  50  51  32 116 104 105 115  32 105 115  32  97  32 115
> >> >> >>> 116
> >> >> >>> 114
> >> >> >>> 105 110 103
> >> >> >>>
> >> >> >>> --
> >> >> >>>
> >> >> >>> David Winsemius, MD
> >> >> >>> West Hartford, CT
> >> >> >>>
> >> >> >>>
> >> >> >>
> >> >> >>
> >> >> >> --
> >> >> >> Rajesh.J
> >> >> >>
> >> >> >>
> >> >> >>
> >> >> >>  David Winsemius, MD
> >> >> >> West Hartford, CT
> >> >> >>
> >> >> >>
> >> >> >
> >> >> >
> >> >> > --
> >> >> > Rajesh.J
> >> >> >
> >> >> >        [[alternative HTML version deleted]]
> >> >> >
> >> >> > ______________________________________________
> >> >> > 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
> >> >> > and provide commented, minimal, self-contained, reproducible code.
> >> >> >
> >> >>
> >> >>
> >> >>
> >> >> --
> >> >> Joshua Wiley
> >> >> Ph.D. Student, Health Psychology
> >> >> University of California, Los Angeles
> >> >> http://www.joshuawiley.com/
> >> >
> >> >
> >> >
> >> > --
> >> > Rajesh.J
> >> >
> >> >
> >> >
> >>
> >>
> >>
> >> --
> >> Joshua Wiley
> >> Ph.D. Student, Health Psychology
> >> University of California, Los Angeles
> >> http://www.joshuawiley.com/
> >
> >
> >
> > --
> > Rajesh.J
> >
> >
> >
>
>
>
> --
> Joshua Wiley
> Ph.D. Student, Health Psychology
> University of California, Los Angeles
> http://www.joshuawiley.com/
>



-- 
Rajesh.J

	[[alternative HTML version deleted]]

