Description Details Author(s) References See Also Examples
This package provides arithmetic functions for native R matrices and
big.matrix
objects.
This package provides arithmetic functions for native R matrices and
big.matrix
objects.
The package defines a number of
global options that begin with bigalgebra
.
They include:
Option | Default value |
bigalgebra.temp_pattern | "matrix_" |
bigalgebra.tempdir | tempdir |
bigalgebra.mixed_arithmetic_returns_R_matrix | TRUE |
bigalgebra.DEBUG | FALSE |
The bigalgebra.tempdir
option must be a function that returns
a temporary directory path used to big matrix results of BLAS and
LAPACK operations. The deault value is simply the default R tempdir
function.
The bigalgebra.temp_pattern
is a name prefix for file names of generated
big matrix objects output as a result of BLAS and LAPACK operations.
The bigalgebra.mixed_arithmetic_returns_R_matrix
option determines
whether arithmetic operations involving an R matrix or vector and a big.matrix
matrix or vector return a big matrix (when the option is FALSE
), or
return a normal R matrix (TRUE
).
The package is built, by default, with R's native BLAS libraries, which use 32-bit signed integer indexing. The default build is limited to vectors of at most 2**31 - 1 entries and matrices with at most 2**31 - 1 rows and 2**31 - 1 columns (note that standard R matrices are limtied to 2**31 - 1 total entries).
The package includes a reference BLAS implementation that supports 64-bit integer indexing, relaxing the limitation on vector lengths and matrix row and column limits. Installation of this package with the 64-bit reference BLAS implementation may be performed from the command-line install:
REFBLAS=1 R CMD INSTALL bigalgebra
where "bigalgebra
" is the source package (for example,
bigalgebra_0.8.4.tar.gz
).
The package may also be build with user-supplied external BLAS and LAPACK libraries, in either 32- or 64-bit varieties. This is an advanced topic that requires additional Makevars modification, and may include adjustment of the low-level calling syntax depending on the library used.
Feel free to contact us for help installing and running the package.
Michael J. Kane, Bryan Lewis, John W. Emerson
Maintainers: Mike and Jay <bigmemoryauthors@gmail.com>
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | # Testing the development of the user-friendly operators:
# if you have any problems, please email us! - Jay & Mike 4/29/2010
library("bigmemory")
A <- big.matrix(5,4,init=1)
B <- big.matrix(4,4,init=2)
C <- A
D <- A[]
print(C - D) # Compare the results (subtraction of an R matrix from a
# big.matrix)
# The next example illustrates mixing R and big.matrix objects. It returns by
# default (see # options("bigalgebra.mixed_arithmetic_returns_R_matrix")
D <- matrix(rnorm(16),4)
E <- A
|
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