pbdSLAP (version 0.2-6)

SLAP Grid Information: SLAP Grid

Description

These functions initializes a grid of pbdSLAP, assigns the information to a global object, and free the grid.

Usage

slap.init.grid(nprow, npcol = 1, ictxt = 0)
  slap.exit.grid(ictxt)
  slap.finalize(quit.mpi = FALSE)

Arguments

nprow

number of row processors.

npcol

number of column processors.

ictxt

the grid id

quit.mpi

if finalize MPI.

Value

slap.init.grid assigns a global object .__grid_info_0 for ictxt = 0 containing the grid information. slap.exit.grid free the grid. slap.finalize free all memory.

Details

This function arranges all processors in a (nprow * npcol) grid and the grid will map the big data matrix.

References

Programming with Big Data in R Website: http://r-pbd.org/

ScaLAPACK Website: http://www.netlib.org/scalapack/

ScaLAPACK Block Cyclic Data Distribution Website: http://icl.cs.utk.edu/lapack-forum/viewtopic.php?f=5&t=4922

Examples

# NOT RUN {
### Under command mode, run the demo with 2 processors by
### (Use Rscript.exe for windows system)

mpiexec -np 2 Rscript -e "demo(gridinfo,'pbdSLAP',ask=F,echo=F)"
# }

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