[R] Assign Formulas to Arrays or Matrices?
Peter Ehlers
ehlers at ucalgary.ca
Tue Jul 6 10:13:39 CEST 2010
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? Thanks.not at real.com
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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