r - multidimensional arrays of data frames -


i define 3d-array of data.frame(a,b,c,...) can 

for (x in 1:4)   (y in 1:5)     (z in 1:5) {        m[x,y,z]$a <- dnorm(1)        m[x,y,z]$b <- dnorm(1)        m[x,y,z]$c <- dnorm(1)     }

it ok too, if data.frame(x,y,z,a,b,c) x,y,z ids , short , effizient way manipulate , read line "x,y,z".

perhaps there better ideas? rid of 

ma[x,y,z] <- ... mb[x,y,z] <- ... mc[x,y,z] <- ...

i'm guessing meant rnorm since populating entire array dnorm(1) wouldn't seem interesting. lot faster make arrays in 1 pass with:

m <- array( rnorm(4*5*5*3),              dims= c(4,5,5, 3) ,              dimnames=list(x=null, y=null, z=null, lets=c("a","b","c") ) )

so access 4d array, be:

> m[ 1,1,1,"a"]                   0.6773062520076687   > m[ 1,1,1,"b"]                  b  0.6229924684213618  > m[ 1,1,1,"c"]                  c  0.6899440670029088

or if wanted 3 of them vector:

> m[ 1,1,1, ]                                   b                  c  0.6773062520076687 0.6229924684213618 0.6899440670029088

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