How to calculate the spatial correlation of several files?
Hello, Inline. Em 03-12-2012 15:15, Jonsson escreveu:
dir1 <- list.files("C:\\Users\\aalyaari\\Desktop\\cor", "*.bin",
full.names = TRUE)
dir2 <- list.files("C:\\Users\\aalyaari\\Desktop\\cor2", "*.bin",
full.names = TRUE)
results <- list()
for (.files in dir1){ # read in the 365 files as a vector of
numbers for dir1
file1 <- do.call(rbind,(lapply(.files, readBin , integer() , size =
2 ,
n = 360 * 720 , signed = T))) }
for (.files in dir2){ # read in the 365 files as a vector of
numbers for dir2
file2<- do.call(rbind,(lapply(.files, readBin , integer() , size =
2 ,
n = 360 * 720 , signed = T))) }
# Now each file in both directories is a vector.
Are you sure? Shouldn't your file reading routines be
do.call(rbind, lapply(dir1, readBin, integer(), size = 2, n = 360 * 720,
signed = T))
do.call(rbind, lapply(dir2, readBin, integer(), size = 2, n = 360 * 720,
signed = T))
to lapply readBin to each file in dir1/dir2?
Anyway, to correlate the first row in file1 to the first row in file2,
etc, try
for (.f in seq_along(dir1)){
results[[.f]]<- cor(file1[, .f] ,file2[, .f])
}
Hope this helps,
Rui Barradas
I am not sure how
to tell R to correlate the first column in dir1 to the correspond column
from dir2. we will finally get only one spatial correlation map.
I tried to this:
# calculate the correlation so we will get a correlation map
for (.files in seq_along(dir1)){
results[[length(results) + 1L]]<- cor(file1 ,file2)
}
I got error:Error in cor(file1, file2) : allocMatrix: too many elements
specified`
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