[R] Help in creating a matrix
Hi
I have dataset with n variables, say n =3 x y z
the formula should be form = x+y+z+x*x +x*y+x*z +y*y + y*z+z*z
my code has to for loop
Is there any way to reduce two loops
for (i in 1:n)
{
for (j in i:n)
{
dat= cbind(dat,dat[,i]*dat[,j])
}
}
-
Thanks in Advance
Arun
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Re: [R] Help in creating a matrix
I have dataset with n variables, say n =3 x y z
the formula should be form = x+y+z+x*x +x*y+x*z +y*y + y*z+z*z
my code has to for loop
Is there any way to reduce two loops
for (i in 1:n)
{
for (j in i:n)
{
dat= cbind(dat,dat[,i]*dat[,j])
}
}
Yes; use outer
But
- Why only two levels of looping for three variables?
- What have i, j and dat to do with the formula?
- Why doesnt the formula appear anywhere in the loop?
-
Thanks in Advance
Arun
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and provide commented, minimal, self-contained, reproducible code.
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and provide commented, minimal, self-contained, reproducible code.
Re: [R] Help in creating a matrix
The formula is created sepearately and data is created for the formula and then use the modelling lm - Thanks in Advance Arun -- View this message in context: http://r.789695.n4.nabble.com/Help-in-creating-a-matrix-tp4551532p4551967.html Sent from the R help mailing list archive at Nabble.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.
