R help - Apr 2010 - how to make read in a vector of 0s and 1s with no space between them

Hi all,

Probably a rudimentary question. I have a flat file that looks like
this (the real one has ~10e6 elements):

10110100101001011101011

and I want to pull that into R as a vector, but with each digit being
it's own element. There are no separators between the digits. How can
I accomplish this? Thanks in advance!

Matt

-- 
Matthew C Keller
Asst. Professor of Psychology
University of Colorado at Boulder
www.matthewckeller.com

*Solution:*
strsplit(c("10110100101001011101011"), "")

But make sure you change the output data type to the one you like (boolean,
numeric  and so on)



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On Sun, Apr 25, 2010 at 7:52 PM, Matthew Keller
<mckellercran@gmail.com>wrote:
> Hi all,
>
> Probably a rudimentary question. I have a flat file that looks like
> this (the real one has ~10e6 elements):
>
> 10110100101001011101011
>
> and I want to pull that into R as a vector, but with each digit being
> it's own element. There are no separators between the digits. How can
> I accomplish this? Thanks in advance!
>
> Matt
>
> --
> Matthew C Keller
> Asst. Professor of Psychology
> University of Colorado at Boulder
> www.matthewckeller.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
> and provide commented, minimal, self-contained, reproducible code.
>
	[[alternative HTML version deleted]]

Hi all,

Quickly received an answer off the list. To do this is easy. Pull it
in using e.g., scan(). Then use strsplit:

z <- '10001011010010'
strsplit(z,'')

On Sun, Apr 25, 2010 at 10:52 AM, Matthew Keller <mckellercran at
gmail.com> wrote:
> Hi all,
>
> Probably a rudimentary question. I have a flat file that looks like
> this (the real one has ~10e6 elements):
>
> 10110100101001011101011
>
> and I want to pull that into R as a vector, but with each digit being
> it's own element. There are no separators between the digits. How can
> I accomplish this? Thanks in advance!
>
> Matt
>
> --
> Matthew C Keller
> Asst. Professor of Psychology
> University of Colorado at Boulder
> www.matthewckeller.com
>


-- 
Matthew C Keller
Asst. Professor of Psychology
University of Colorado at Boulder
www.matthewckeller.com

See readBin(), e.g.

r <- readBin(pathname, what="raw", n=10e6);
str(r);
# raw [1:21] 30 31 30 31 ...
c <- rawToChar(x, multiple=TRUE);
str(c);
# chr [1:21] "0" "1" "0" "1"
"0" "0" "1" "0" "1"
"0" ...
i <- as.integer(r);
str(i);
#  int [1:21] 48 49 48 49 48 48 49 48 49 48 ...

/Henrik

On Sun, Apr 25, 2010 at 6:52 PM, Matthew Keller <mckellercran at
gmail.com> wrote:
> Hi all,
>
> Probably a rudimentary question. I have a flat file that looks like
> this (the real one has ~10e6 elements):
>
> 10110100101001011101011
>
> and I want to pull that into R as a vector, but with each digit being
> it's own element. There are no separators between the digits. How can
> I accomplish this? Thanks in advance!
>
> Matt
>
> --
> Matthew C Keller
> Asst. Professor of Psychology
> University of Colorado at Boulder
> www.matthewckeller.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.
>

On 25/04/2010 12:52 PM, Matthew Keller wrote:
> Hi all,
>
> Probably a rudimentary question. I have a flat file that looks like
> this (the real one has ~10e6 elements):
>
> 10110100101001011101011
>
> and I want to pull that into R as a vector, but with each digit being
> it's own element. There are no separators between the digits. How can
> I accomplish this? Thanks in advance!

Is it broken up into lines at all?  Then read.fwf might be what you 
want.  If it's just a huge collection of 0s and 1s with no line breaks, 
then use readChar(filename, nchar=1) to read the individual characters, 
and later convert them to digits using ifelse(), e.g.

chars <- readChar(filename, nchar=1)
digits <- ifelse(chars=="1", 1, ifelse(chars == "0", 0,
NA))

if (any(is.na(digits))) stop("not all 0s and 1s!")

Duncan Murdoch