scidb (version 1.1-2)

df2scidb: Copy a data frame into a SciDB array.

Description

Copy a data frame into a new 1-D SciDB array.

Usage

df2scidb(X, name = tmpnam(), dimlabel = "row", chunkSize,
         rowOverlap = 0L, types = NULL, nullable, schema_only = FALSE, gc, start)

Arguments

X

A data frame.

name

The SciDB array name, defaults to an automatically-generated name.

dimlabel

Name the SciDB dimension.

chunkSize

The SciDB chunk size.

rowOverlap

The SciDB chunk overlap.

types

An optional vector explicitly specifying the SciDB attribute types. Length must match the number of columns of the data frame.

nullable

An optional vector indicating the SciDB nullable property of each attribute. Length must match the number of columns of the data frame.

schema_only

If TRUE, return a string that would represent the SciDB array schema without uploading data to SciDB.

gc

Optional logical value. If TRUE, then resulting SciDB array will be garbage-collected when the R variable referencing it is. The default value is FALSE.

start

Optional integer starting index value. Defaults to 1.

Value

• NULL is invisibly returned. SciDB errors are propagated as R error conditions.

Details

df2scidb is a workhorse utility function that transfers an R data frame into a 1-D SciDB array via intermediate CSV formatting. The columns of the data frame correspond to attributes in the SciDB array. The iquery function returns query results using a similar method as R data frames.

Examples

df2scidb(iris)
scidblist()
head(iquery("scan(iris)", return=TRUE))