index.gdsn: Get the specified node
In gdsfmt: R Interface to CoreArray Genomic Data Structure (GDS) Files

Description Usage Arguments Details Value Author(s) References See Also Examples

Get a specified GDS node.

1	index.gdsn(node, path=NULL, index=NULL, silent=FALSE)

`node`	an object of class `gdsn.class` (a GDS node), or `gds.class` (a GDS file)
`path`	the path specifying a GDS node with '/' as a separator
`index`	a numeric vector or characters, specifying the path; it is applicable if `path=NULL`
`silent`	if `TRUE`, return NULL if the specified node does not exist

If index is a numeric vector, e.g., c(1, 2), the result is the second child node of the first child of node. If index is a vector of characters, e.g., c("list", "x"), the result is the child node with name "x" of the "list" child node.

An object of class gdsn.class for the specified node.

Xiuwen Zheng

http://github.com/zhengxwen/gdsfmt

cnt.gdsn, ls.gdsn, name.gdsn, add.gdsn, delete.gdsn

# cteate a GDS file
f <- createfn.gds("test.gds")

# add a list to "test.gds"
node <- add.gdsn(f, name="list", val=list(x=c(1,2), y=c("T","B","C"), z=TRUE))
f

index.gdsn(f, "list/x")
index.gdsn(f, index=c("list", "x"))
index.gdsn(f, index=c(1, 1))
index.gdsn(f, index=c("list", "z"))

## Not run: 
index.gdsn(f, "list/x/z")
# Error in index.gdsn(f, "list/x/z") : Invalid path "list/x/z"!

## End(Not run)

# return NULL
index.gdsn(f, "list/x/z", silent=TRUE)

# close the GDS file
closefn.gds(f)


# delete the temporary file
unlink("test.gds", force=TRUE)