Displaying 2 results from an estimated 2 matches for "vectorizaton".
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vectorization
2005 Jul 12
1
vectorizaton
Hi,
I got 1000 NxN matrices grouped in one array. I want one matrix in which p_ij is the average of all the 1000 matrices in the array. Here's what I'm trying to do:
# P is the NxNx1000 array
for(i in 1:N)
for(j in 1:N)
for(k in 1: 1000)
mymat[ i, j ] <- mean( P [i , j , k ] )
Otherwise, I could have a NxNx1000 vector, and get the N^2 means of the 1+ (N^2)*(0: 999) elements. I
2009 Aug 19
2
how do i vectorize relational queries in R
...ta <- data.frame(c(1,1,1,2,2,2,3,3,3),rep(2,9)); names(data) <-
> c("Sample","Score")
> meta <- data.frame(c(1,2,3),c("Tree","Tree","Shrub")); names(meta) <-
> c("Sample","Stratum")
The following attempt at vectorizaton doesn't work:
> data$Stratum <- meta$Stratum[which(data$Sample == meta$Sample)]
> data$Stratum
[1] Tree <NA> <NA> Tree <NA> <NA> Tree <NA> <NA>
And actually, when I try to run a loop, the operation converts the string to
a factor.
> for (i i...