Re: [R] analog to the matlab buffer function?
do.call(rbind,lapply(0:4,function(i){i+(1:5)}))
[,1] [,2] [,3] [,4] [,5]
[1,]12345
[2,]23456
[3,]34567
[4,]45678
[5,]56789
On 1 Dec 2006, at 00:32, Charles C. Berry wrote:
See
?embed
It is not quite the same, but this seems to be what you want - at
least
for the example you give:
t( embed(1:5,3) )[3:1,]
[,1] [,2] [,3]
[1,]123
[2,]234
[3,]345
On Fri, 1 Dec 2006, Martin Ivanov wrote:
Hello! I am new to R. I could not find a function analogous to
matlab's
function buffer, which is used in signal processing. Is there such a
function in R? What I need to do is as follows. If I apply the
function
to the vector c(1:5) for example with a window length 3 and
overlapping
2, I need to get a matrix like this:
1 2 3
2 3 4
3 4 5
In matlab this is achieved with the function buffer. Is there
ananalogous R function?
Thank you very much in advance.
Regards,
Martin
__
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PLEASE do read the posting guide http://www.R-project.org/posting-
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Charles C. Berry(858) 534-2098
Dept of Family/Preventive
Medicine
E mailto:[EMAIL PROTECTED] UC San Diego
http://biostat.ucsd.edu/~cberry/ La Jolla, San Diego
92093-0717
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PLEASE do read the posting guide http://www.R-project.org/posting-
guide.html
and provide commented, minimal, self-contained, reproducible code.
--
Robin Hankin
Uncertainty Analyst
National Oceanography Centre, Southampton
European Way, Southampton SO14 3ZH, UK
tel 023-8059-7743
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Re: [R] analog to the matlab buffer function?
The gtools package also includes a function, 'running', which accomplishes
the desired task:
library(gtools)
t(running(1:5, width=3, fun=c))
[,1] [,2] [,3]
1:3123
2:4234
3:5345
On 11/30/06 8:56 PM, Marc Schwartz [EMAIL PROTECTED] wrote:
Here is another possibility, though I may be missing how the Matlab
function handles incomplete rows generated at the end of the source
vector. I have not fully tested this, so it may yet require some
tweaking and certainly appropriate error checking.
I am presuming that the basic premise is that each row is of length
'window' and that it overlaps with the END of prior row by 'overlap'.
Buffer - function(x, window, overlap)
{
Res - NULL
while (length(x) = window)
{
Res - c(Res, x[1:window])
x - x[(1 + window - overlap):length(x)]
}
matrix(Res, ncol = window, byrow = TRUE)
}
Buffer(1:5, 3, 2)
[,1] [,2] [,3]
[1,]123
[2,]234
[3,]345
Buffer(1:10, 4, 2)
[,1] [,2] [,3] [,4]
[1,]1234
[2,]3456
[3,]5678
[4,]789 10
HTH,
Marc Schwartz
On Thu, 2006-11-30 at 16:32 -0800, Charles C. Berry wrote:
See
?embed
It is not quite the same, but this seems to be what you want - at least
for the example you give:
t( embed(1:5,3) )[3:1,]
[,1] [,2] [,3]
[1,]123
[2,]234
[3,]345
On Fri, 1 Dec 2006, Martin Ivanov wrote:
Hello! I am new to R. I could not find a function analogous to matlab's
function buffer, which is used in signal processing. Is there such a
function in R? What I need to do is as follows. If I apply the function
to the vector c(1:5) for example with a window length 3 and overlapping
2, I need to get a matrix like this:
1 2 3
2 3 4
3 4 5
In matlab this is achieved with the function buffer. Is there ananalogous R
function?
__
R-help@stat.math.ethz.ch 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.
__
R-help@stat.math.ethz.ch 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.
Re: [R] analog to the matlab buffer function?
See ?embed It is not quite the same, but this seems to be what you want - at least for the example you give: t( embed(1:5,3) )[3:1,] [,1] [,2] [,3] [1,]123 [2,]234 [3,]345 On Fri, 1 Dec 2006, Martin Ivanov wrote: Hello! I am new to R. I could not find a function analogous to matlab's function buffer, which is used in signal processing. Is there such a function in R? What I need to do is as follows. If I apply the function to the vector c(1:5) for example with a window length 3 and overlapping 2, I need to get a matrix like this: 1 2 3 2 3 4 3 4 5 In matlab this is achieved with the function buffer. Is there ananalogous R function? Thank you very much in advance. Regards, Martin __ R-help@stat.math.ethz.ch 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. Charles C. Berry(858) 534-2098 Dept of Family/Preventive Medicine E mailto:[EMAIL PROTECTED] UC San Diego http://biostat.ucsd.edu/~cberry/ La Jolla, San Diego 92093-0717 __ R-help@stat.math.ethz.ch 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.
Re: [R] analog to the matlab buffer function?
Here is another possibility, though I may be missing how the Matlab
function handles incomplete rows generated at the end of the source
vector. I have not fully tested this, so it may yet require some
tweaking and certainly appropriate error checking.
I am presuming that the basic premise is that each row is of length
'window' and that it overlaps with the END of prior row by 'overlap'.
Buffer - function(x, window, overlap)
{
Res - NULL
while (length(x) = window)
{
Res - c(Res, x[1:window])
x - x[(1 + window - overlap):length(x)]
}
matrix(Res, ncol = window, byrow = TRUE)
}
Buffer(1:5, 3, 2)
[,1] [,2] [,3]
[1,]123
[2,]234
[3,]345
Buffer(1:10, 4, 2)
[,1] [,2] [,3] [,4]
[1,]1234
[2,]3456
[3,]5678
[4,]789 10
HTH,
Marc Schwartz
On Thu, 2006-11-30 at 16:32 -0800, Charles C. Berry wrote:
See
?embed
It is not quite the same, but this seems to be what you want - at least
for the example you give:
t( embed(1:5,3) )[3:1,]
[,1] [,2] [,3]
[1,]123
[2,]234
[3,]345
On Fri, 1 Dec 2006, Martin Ivanov wrote:
Hello! I am new to R. I could not find a function analogous to matlab's
function buffer, which is used in signal processing. Is there such a
function in R? What I need to do is as follows. If I apply the function
to the vector c(1:5) for example with a window length 3 and overlapping
2, I need to get a matrix like this:
1 2 3
2 3 4
3 4 5
In matlab this is achieved with the function buffer. Is there ananalogous R
function?
__
R-help@stat.math.ethz.ch 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.
