bigalgebra-package {bigalgebra} | R Documentation |

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.

Frédéric Bertrand, Michael J. Kane, Bryan Lewis, John W. Emerson

Maintainer: Frédéric Bertrand <frederic.bertrand@utt.fr>

https://www.netlib.org/lapack/

```
# 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, type="double", init=0,
dimnames=list(NULL, c("alpha", "beta")))
B <- big.matrix(4,4, type="double", init=0,
dimnames=list(NULL, c("alpha", "beta")))
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
```

[Package *bigalgebra* version 1.1.1 Index]