Factory function to open a SOMA measurement for reading (lifecycle: maturing).
Usage
SOMAMeasurementOpen(
uri,
mode = "READ",
platform_config = NULL,
tiledbsoma_ctx = NULL,
tiledb_timestamp = NULL
)Arguments
- uri
URI for the TileDB object.
- mode
One of “
READ” or “WRITE”.- platform_config
Optional platform configuration.
- tiledbsoma_ctx
Optional SOMATileDBContext.
- tiledb_timestamp
Optional Datetime (POSIXct) for TileDB timestamp; defaults to the current time. If not
NULL, all members accessed through the collection inherit the timestamp.
Value
A SOMA measurement stored at
uri opened in mode mode.
Examples
uri <- withr::local_tempfile(pattern = "soma-measurement")
var <- data.frame(
soma_joinid = bit64::seq.integer64(0L, 99L),
var_id = paste0("feature_", seq_len(100L))
)
sch <- arrow::infer_schema(var)
(ms <- SOMAMeasurementCreate(uri))
#> <SOMAMeasurement>
#> uri: /tmp/RtmpjD0Pq2/soma-measurement27091244cc66
sdf <- ms$add_new_dataframe(
"var",
sch,
"soma_joinid",
list(soma_joinid = c(0, 100))
)
sdf$write(arrow::as_arrow_table(var, schema = sch))
sdf$close()
ms$close()
(ms <- SOMAMeasurementOpen(uri))
#> <SOMAMeasurement>
#> uri: /tmp/RtmpjD0Pq2/soma-measurement27091244cc66
ms$var
#> <SOMADataFrame>
#> uri: file:///tmp/RtmpjD0Pq2/soma-measurement27091244cc66/var
#> dimensions: soma_joinid
#> attributes: var_id