Re: [R] Seeking help on Vectorize()
Megh Dal wrote:
Dear falks, here I have written following function :
fn <- Vectorize(function(x = 1:3, y = 3:6) {
x <- matrix(x, nrow=1)
y <- matrix(y, ncol=1)
dat <- apply(x, 2, function(xx) {
apply(y, 1, function(yy) {
return(xx + yy) } ) })
return(dat)}, SIMPLIFY = TRUE)
If I run this function, I got some warning message, even format of the returned
object is not correct, for example :
fn(x = 1:3, y = 3:7)
[1] 4 6 8 7 9
Warning message:
In mapply(FUN = function (x = 1:3, y = 3:6) :
longer argument not a multiple of length of shorter
However if I run individual line of codes like :
x <- 1:3; y = 3:7
x <- matrix(x, nrow=1)
y <- matrix(y, ncol=1)
dat <- apply(x, 2, function(xx) {
+ apply(y, 1, function(yy) {
+ return(xx + yy) } ) })
dat
[,1] [,2] [,3]
[1,]456
[2,]567
[3,]678
[4,]789
[5,]89 10
I get exactly what I want. Where I am making fault?
I think you don't understand what Vectorize is trying to do. It is
basically a way to run a loop, calling your function with each matching
pair of x and y values, i.e. x=1, y=3 in the first call, then x=2 y=4 in
the second, etc. The warning comes because you have three x values and
five y values, so it will repeat the 1st two x values -- but it warns
you that's likely not what you intended.
Duncan Murdoch
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Re: [R] Seeking help on Vectorize()
Hi:
This is shorter:
t(outer(x, y, '+'))
[,1] [,2] [,3]
[1,]456
[2,]567
[3,]678
[4,]789
[5,]89 10
HTH,
Dennis
On Wed, Jun 2, 2010 at 2:25 AM, Megh Dal wrote:
> Dear falks, here I have written following function :
>
> fn <- Vectorize(function(x = 1:3, y = 3:6) {
> x <- matrix(x, nrow=1)
> y <- matrix(y, ncol=1)
> dat <- apply(x, 2, function(xx) {
> apply(y, 1, function(yy) {
> return(xx + yy) } ) })
> return(dat)}, SIMPLIFY = TRUE)
>
> If I run this function, I got some warning message, even format of the
> returned object is not correct, for example :
>
> > fn(x = 1:3, y = 3:7)
> [1] 4 6 8 7 9
> Warning message:
> In mapply(FUN = function (x = 1:3, y = 3:6) :
> longer argument not a multiple of length of shorter
>
> However if I run individual line of codes like :
>
> > x <- 1:3; y = 3:7
> > x <- matrix(x, nrow=1)
> > y <- matrix(y, ncol=1)
> > dat <- apply(x, 2, function(xx) {
> + apply(y, 1, function(yy) {
> + return(xx + yy) } ) })
> > dat
> [,1] [,2] [,3]
> [1,]456
> [2,]567
> [3,]678
> [4,]789
> [5,]89 10
>
>
> I get exactly what I want. Where I am making fault?
>
> Thanks,
>
>
>
>[[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.
>
>
[[alternative HTML version deleted]]
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Re: [R] Seeking help on Vectorize()
Your arguments are not coming through.
fn <- function(x = 1:3, y = 3:6) {
x <- matrix(x, nrow=1)
y <- matrix(y, ncol=1)
dat <- apply(x, 2, function(xx) {
apply(y, 1, function(yy) {
return(xx + yy) } ) })
Vectorize(dat, SIMPLIFY = TRUE)
return(dat)}
> fn(1:3,3:7)
[,1] [,2] [,3]
[1,]456
[2,]567
[3,]678
[4,]789
[5,]89 10
Cheers
Joris
On Wed, Jun 2, 2010 at 11:25 AM, Megh Dal wrote:
> Dear falks, here I have written following function :
>
> fn <- Vectorize(function(x = 1:3, y = 3:6) {
> x <- matrix(x, nrow=1)
> y <- matrix(y, ncol=1)
> dat <- apply(x, 2, function(xx) {
> apply(y, 1, function(yy) {
> return(xx + yy) } ) })
> return(dat)}, SIMPLIFY = TRUE)
>
> If I run this function, I got some warning message, even format of the
> returned object is not correct, for example :
>
> > fn(x = 1:3, y = 3:7)
> [1] 4 6 8 7 9
> Warning message:
> In mapply(FUN = function (x = 1:3, y = 3:6) :
> longer argument not a multiple of length of shorter
>
> However if I run individual line of codes like :
>
> > x <- 1:3; y = 3:7
> > x <- matrix(x, nrow=1)
> > y <- matrix(y, ncol=1)
> > dat <- apply(x, 2, function(xx) {
> + apply(y, 1, function(yy) {
> + return(xx + yy) } ) })
> > dat
> [,1] [,2] [,3]
> [1,]456
> [2,]567
> [3,]678
> [4,]789
> [5,]89 10
>
>
> I get exactly what I want. Where I am making fault?
>
> Thanks,
>
>
>
>[[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.
>
>
--
Joris Meys
Statistical Consultant
Ghent University
Faculty of Bioscience Engineering
Department of Applied mathematics, biometrics and process control
Coupure Links 653
B-9000 Gent
tel : +32 9 264 59 87
joris.m...@ugent.be
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Disclaimer : http://helpdesk.ugent.be/e-maildisclaimer.php
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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.
[R] Seeking help on Vectorize()
Dear falks, here I have written following function :
fn <- Vectorize(function(x = 1:3, y = 3:6) {
x <- matrix(x, nrow=1)
y <- matrix(y, ncol=1)
dat <- apply(x, 2, function(xx) {
apply(y, 1, function(yy) {
return(xx + yy) } ) })
return(dat)}, SIMPLIFY = TRUE)
If I run this function, I got some warning message, even format of the returned
object is not correct, for example :
> fn(x = 1:3, y = 3:7)
[1] 4 6 8 7 9
Warning message:
In mapply(FUN = function (x = 1:3, y = 3:6) :
longer argument not a multiple of length of shorter
However if I run individual line of codes like :
> x <- 1:3; y = 3:7
> x <- matrix(x, nrow=1)
> y <- matrix(y, ncol=1)
> dat <- apply(x, 2, function(xx) {
+ apply(y, 1, function(yy) {
+ return(xx + yy) } ) })
> dat
[,1] [,2] [,3]
[1,] 4 5 6
[2,] 5 6 7
[3,] 6 7 8
[4,] 7 8 9
[5,] 8 9 10
I get exactly what I want. Where I am making fault?
Thanks,
[[alternative HTML version deleted]]
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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.
