read.gdsn {gdsfmt} | R Documentation |
Get data from a GDS node.
read.gdsn(node, start=NULL, count=NULL, simplify=c("auto", "none", "force"), .useraw=FALSE, .value=NULL, .substitute=NULL, .sparse=TRUE)
node |
an object of class |
start |
a vector of integers, starting from 1 for each dimension component |
count |
a vector of integers, the length of each dimnension. As a
special case, the value "-1" indicates that all entries along that
dimension should be read, starting from |
simplify |
if |
.useraw |
use R RAW storage mode if integers can be stored in a byte, to reduce memory usage |
.value |
a vector of values to be replaced in the original data array, or NULL for nothing |
.substitute |
a vector of values after replacing, or NULL for
nothing; |
.sparse |
only applicable for the sparse array nodes, if |
start
, count
: the values in data are taken to be those
in the array with the leftmost subscript moving fastest.
Return an array, list
, or data.frame
.
Xiuwen Zheng
http://github.com/zhengxwen/gdsfmt
readex.gdsn
, append.gdsn
,
write.gdsn
, add.gdsn
# cteate a GDS file f <- createfn.gds("test.gds") add.gdsn(f, "vector", 1:128) add.gdsn(f, "list", list(X=1:10, Y=seq(1, 10, 0.25))) add.gdsn(f, "data.frame", data.frame(X=1:19, Y=seq(1, 10, 0.5))) add.gdsn(f, "matrix", matrix(1:12, ncol=4)) f read.gdsn(index.gdsn(f, "vector")) read.gdsn(index.gdsn(f, "list")) read.gdsn(index.gdsn(f, "data.frame")) # the effects of 'simplify' read.gdsn(index.gdsn(f, "matrix"), start=c(2,2), count=c(-1,1)) # [1] 5 6 <- a vector read.gdsn(index.gdsn(f, "matrix"), start=c(2,2), count=c(-1,1), simplify="none") # [,1] <- a matrix # [1,] 5 # [2,] 6 read.gdsn(index.gdsn(f, "matrix"), start=c(2,2), count=c(-1,3)) read.gdsn(index.gdsn(f, "matrix"), start=c(2,2), count=c(-1,3), .value=c(12,5), .substitute=NA) # close the GDS file closefn.gds(f) # delete the temporary file unlink("test.gds", force=TRUE)