Ruby-LAPACK

- a Ruby wrapper of LAPACK -

What's Ruby-LAPACK

Ruby-LAPACK is a Ruby wrapper of LAPACK.

Download

the latest version is 1.8.2 [05 Nov 2021]

gem

# gem install ruby-lapack

source files

ruby-lapack-1.8.2.tar.gz
You can also get from git repository

% git clone http://ruby.gfd-dennou.org/products/ruby-lapack/ruby-lapack.git

Requires

• Ruby
• LAPACK
• NArray

Usage

You need require numru/lapack to use Ruby-LAPACK

require 'numru/lapack'

Each subroutine/function is defined as module function of NumRu::Lapack.

returns = NumRu::Lapack.method_name(args)

• Arguments
The arguments of each method are the arguments of the corresponding subroutine/function without arguments for output, workspace and dimension size of array.
• Returns
The methods return the arguments for output of the correspoing subroutine/function.

NumRu::Lapack.method_name(:help => true)
NumRu::Lapack.method_name(:usage => true)

Documents

Documents for individual methods are here

Example

DSYEVR: Compultes selected eigenvalues, and optinally, eigenvectors of a real symmetric matrix.
The following script calculats the leading eigenvalue and corresponding eigenvector of the matrix (x_11 = 1, x_12 = x_21 = 2, x_22 = 3).
Ruby method is NumRu::Lapack.dsyevr.

jobz = "V"
range = "I"
uplo = "U"
a = NArray[[1,2],[2,3]]
vl =  vu = 0 # not be used in this example
il = 1
iu = 2
abstol = 0.0

m, w, z, isuppz, work, iwork, info, a = NumRu::Lapack.dsyevr(jobz, range, uplo, a, vl, vu, il, iu, abstol)

SUBROUTINE DSYEVR(JOBZ, RANGE, UPLO, N, A, LDA, VL, IL, IU, ABSTOL, M, W, Z, LDZ, ISUPPZ, WORK, LWORK, IWORK, LIWORK, INFO)
# JOBZ(input), RANGE(input), UPLO(input)
# N(input), A(input/output), LDA(input)
# VL(input), IL(input), IU(input), ABSTOL(input)
# M(output), W(output), Z(output), LDZ(input), ISUPPZ(output)
# WORK(workspace/output), LWORK(input), IWORK(workspace/output), LIWORK(input)
# INFO(output)