H5Scombine_select: Combine two selections

In grimbough/rhdf5: R Interface to HDF5

Combine two selections

Description

Combine two selections

Usage

H5Scombine_select(h5space1, op = h5default("H5S_SELECT"), h5space2)

Arguments

h5space1, h5space2	H5IdComponent objects representing a dataspaces.
op	Character string defined the operation used to join the two dataspaces. See h5const("H5S_SELECT") for the list of available options.

Value

Returns an H5IdComponent object representing a new dataspace. The new dataspace will have the same extent as h5space1 with the hyperslab selection being the result of combining the selections of h5space1 and h5space2.

See Also

H5Scombine_hyperslab()

Examples

## create two 1 dimensional dataspaces
## of different sizes
sid_1 <- H5Screate_simple(dims = 20)
sid_2 <- H5Screate_simple(dims = 10)

## select a single block of 5 points in sid_1
## this is equivalent to [11:16] in R syntax
H5Sselect_hyperslab(sid_1, start = 11, stride = 1, 
                    block = 5, count = 1)

## select 2 blocks of 1 point from sid_2
## equivalent to [c(3,5)] in R syntax
H5Sselect_hyperslab(sid_2, start = 3, stride = 2, 
                    block = 1, count = 2)

## confirm we have select 5 and 2 points resepectively
H5Sget_select_npoints(sid_1)
H5Sget_select_npoints(sid_2)

## combine the two dataset selections keeping points that
## are in one or both of the selections
sid_3 <- H5Scombine_select(sid_1, "H5S_SELECT_OR", sid_2)

## extent of the new dataset is the same as sid_1
sid_3
## confirm the selection contains 7 points
H5Sget_select_npoints(sid_3)

## tidy up
H5Sclose(sid_1)
H5Sclose(sid_2)
H5Sclose(sid_3)

grimbough/rhdf5 documentation built on Dec. 9, 2024, 8:40 p.m.