mpi_example: MPI Demonstrations

In RBigData/pbdDEMO: Programming with Big Data -- Demonstrations and Examples Using 'pbdR' Packages

Description

These functions are examples of simple statistics via MPI calls.

Usage

mpi.stat(x.gbd)

mpi.bin(x.gbd, breaks = pi/3 * (-3:3))

mpi.quantile(x.gbd, prob = 0.5)

mpi.ols(y.gbd, X.gbd)

Arguments

x.gbd	gbd a GBD vector.
breaks	a set to break data in groups.
prob	a desired probability for quantile.
y.gbd	a GBD vector.
X.gbd	a GBD matrix.

Details

x.gbd and y.gbd are vectors with length N.gbd. X.gbd is a matrix with dimension N.gbd * p and exists on all processors. N.gbd may be vary across processors.

For demonstration purpose, these objects should not contains weird values such NA.

Value

mpi.stat returns sample mean and sample variance. mpi.bin returns binning counts for the given breaks. mpi.quantile returns a quantile. mpi.ols returns ordinary least square estimates (beta_hat).

Examples

## Not run: 
### Under command mode, run the demo with 4 processors by
### (Use Rscript.exe for windows system)
mpiexec -np 4 Rscript -e "demo(sample_stat,'pbdDEMO',ask=F,echo=F)"
mpiexec -np 4 Rscript -e "demo(binning,'pbdDEMO',ask=F,echo=F)"
mpiexec -np 4 Rscript -e "demo(quantile,'pbdDEMO',ask=F,echo=F)"
mpiexec -np 4 Rscript -e "demo(ols,'pbdDEMO',ask=F,echo=F)"
mpiexec -np 4 Rscript -e "demo(gbd2dmat,'pbdDEMO',ask=F,echo=F)"
mpiexec -np 4 Rscript -e "demo(balance,'pbdDEMO',ask=F,echo=F)"

## End(Not run)

RBigData/pbdDEMO documentation built on May 8, 2019, 4:56 a.m.