On 2010-07-06 1:13, McLovin wrote:
Hi,
I am very new to R. I am hoping to create formulas and assign them to
locations within an array (or matrix, if it will work).
Here's a simplified example of what I'm trying to do:
form.arr<- array(31,5,3)
for (i in seq(from=1, to=31, by=1)) {
for (j in seq(from=1, to=5, by=1)) {
form.arr[i,j,]<- as.formula(y~1+2)
}
}
which results in this error:
Error in form.arr[i, j, ]<- as.formula(y ~ 1 + 2) :
incorrect number of subscripts
The reason I had made the 3rd dimension of the array size 3 is because
that's the length R tells me that formula is.
When I had tried to do this using a matrix, using this code:
form.mat<- matrix(31,5,3)
for (i in seq(from=1, to=31, by=1)) {
for (j in seq(from=1, to=5, by=1)) {
form.mat[i,j] = as.formula(y~1+2)
}
}
I was told:
Error in form.mat[i, j] = as.formula(y ~ 1 + 2) :
number of items to replace is not a multiple of replacement length
My question is: is it possible to assign formulas within a matrix or array?
If so, how? [email protected]
I don't think it's possible in the way you're trying
to do it. A formula is not the same thing as a 3-element
vector.
Why not use a list?
ps. for (i in seq(from=1, to=31, by=1)) is equivalent
to for(i in seq_len(31))
-Peter Ehlers
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