R: Interchange Between Process Number and BLACS Coordinates

pcoords {pbdBASE}

R Documentation

Interchange Between Process Number and BLACS Coordinates

Description

Grabs the existing BLACS context grid information.

Usage

base.pnum(ICTXT, PROW, PCOL)

base.pcoord(ICTXT, PNUM)

Arguments

`ICTXT`	BLACS context number.
`PROW, PCOL`	BLACS grid location row/column
`PNUM`	process rank

Details

For advanced users only. These functions are simple recreations of the BLACS routines BLACS_PNUM and BLACS_PCOORD. The former gets the process number associated with the BLACS process grid location c(MYPROW, MYPCOL), while the latter does the reverse.

Value

pnum returns an integer; pcoord returns a list containing elements PROW and PCOL.

Examples

## Not run: 
# Save code in a file "demo.r" and run with 2 processors by
# > mpiexec -np 2 Rscript demo.r

library(pbdBASE, quiet = TRUE)
init.grid()

blacs_ <- blacs(ICTXT = 0)

# get the ICTXT = 0 BLACS coordsinates for process 0
myCoords <- pcoord(ICTXT = 0, PNUM = 0)

comm.print(myCoords)

finalize()

## End(Not run)

[Package pbdBASE version 0.5-0 Index]