Re: [R] R loop help
Hi there,
That's exactly what I want.
I have checked ?combn out,
but I could get the following,
suppose that I want ALL possible combinations of them,
as this
==
apply(
combn(paste('x', 1:4, sep =), 2), 2,
function(v) get(v[1])*get(v[2])
),
apply(
combn(paste('x', 1:4, sep =), 3), 2,
function(v) get(v[1])*get(v[2])*get(v[3])
),
apply(
combn(paste('x', 1:4, sep =), 4), 2,
function(v) get(v[1])*get(v[2])*get(v[3])*get(v[4])
)
)
==
combn(paste('x', 1:4, sep =), 2)
lists all the '2' factor combinations,
combn(paste('x', 1:4, sep =),3)
lists all the '3' factor combinations,
ect,
I have tried to use
combn(paste('x', 1:4, sep =), c(2,3,4))
to get all possible combinations,
but didnt work
how should I proceed?
Thanks!
casper
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Re: [R] R loop help
An aside to the main question:
I don't think that
i+1:3
is doing what you think it is.
On 26/03/2010 23:01, casperyc wrote:
Hi,
I am tring to write a loop to compute this,
==
x1=c(
rep(-1,4),
rep(1,4)
)
x2=c(
rep(c(-1,-1,1,1),2)
)
x3=c(
rep(c(-1,1),4)
)
x1*x2
x1*x3
x2*x3
suppose i have x1,x2,x3
i want to compute their ' two factor interactions', x1x2,x1x3 and x2x3,
I wrote
for(i in 1:2){
for( j in i+1:3){
xij=c()
xij=xi*xj
}
}
it did not seem to recognize xi and xj
is there any suggestion?
it would be wonderful if there exists a single command that i can use
My ultimate aim is to find the 55 xixj s of the following data:
http://n4.nabble.com/file/n1692945/test_pic.jpg test_pic.jpg
Thanks.
--
Patrick Burns
pbu...@pburns.seanet.com
http://www.burns-stat.com
(home of 'Some hints for the R beginner'
and 'The R Inferno')
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[R] R loop help
Hi,
I am tring to write a loop to compute this,
==
x1=c(
rep(-1,4),
rep(1,4)
)
x2=c(
rep(c(-1,-1,1,1),2)
)
x3=c(
rep(c(-1,1),4)
)
x1*x2
x1*x3
x2*x3
suppose i have x1,x2,x3
i want to compute their ' two factor interactions', x1x2,x1x3 and x2x3,
I wrote
for(i in 1:2){
for( j in i+1:3){
xij=c()
xij=xi*xj
}
}
it did not seem to recognize xi and xj
is there any suggestion?
it would be wonderful if there exists a single command that i can use
My ultimate aim is to find the 55 xixj s of the following data:
http://n4.nabble.com/file/n1692945/test_pic.jpg test_pic.jpg
Thanks.
--
View this message in context:
http://n4.nabble.com/R-loop-help-tp1692945p1692945.html
Sent from the R help mailing list archive at Nabble.com.
__
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and provide commented, minimal, self-contained, reproducible code.
Re: [R] R loop help
Hi casperyc,
Here is a suggestion:
# all at once
apply(combn(paste('x', 1:3, sep =), 2), 2,
function(v) get(v[1])*get(v[2]) )
# step by step
thex - paste('x', 1:3, sep =)
thex
combs - combn(thex, 2)
combs
apply(combs, 2, function(v) get(v[1])*get(v[2]) )
x1, x2 and x3 correspond to the variables you sent. See ?combn, ?apply,
?get and ?paste for more information.
HTH,
Jorge
On Fri, Mar 26, 2010 at 7:01 PM, casperyc wrote:
Hi,
I am tring to write a loop to compute this,
==
x1=c(
rep(-1,4),
rep(1,4)
)
x2=c(
rep(c(-1,-1,1,1),2)
)
x3=c(
rep(c(-1,1),4)
)
x1*x2
x1*x3
x2*x3
suppose i have x1,x2,x3
i want to compute their ' two factor interactions', x1x2,x1x3 and x2x3,
I wrote
for(i in 1:2){
for( j in i+1:3){
xij=c()
xij=xi*xj
}
}
it did not seem to recognize xi and xj
is there any suggestion?
it would be wonderful if there exists a single command that i can use
My ultimate aim is to find the 55 xixj s of the following data:
http://n4.nabble.com/file/n1692945/test_pic.jpg test_pic.jpg
Thanks.
--
View this message in context:
http://n4.nabble.com/R-loop-help-tp1692945p1692945.html
Sent from the R help mailing list archive at Nabble.com.
__
R-help@r-project.org mailing list
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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.
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