V Linear Algebra System

This package implements BLAS and LAPACK functions. It provides two different backends:

• One using Open BLAS when using flag -d cblas. Check also OpenBLAS.
• One using a pure V implementation called VLAS, by default. This implementation can be found on vsl.vlas.vblas.

Therefore, its routines are a little more lower level than the ones in the package vsl.la.

Usage Example

module main

import vsl.vlas
import vsl.la

// matrix_matrix_mul returns the matrix multiplication (scaled)
//
//  c := alpha⋅a⋅b    ⇒    cij := alpha * aik * bkj
//
pub fn matrix_matrix_mul(mut c la.Matrix[f64], alpha f64, a &la.Matrix[f64], b &la.Matrix[f64]) {
	if c.m < 6 && c.n < 6 && a.n < 30 {
		for i in 0 .. c.m {
			for j in 0 .. c.n {
				c.set(i, j, 0.0)
				for k in 0 .. a.n {
					c.add(i, j, alpha * a.get(i, k) * b.get(k, j))
				}
			}
		}
		return
	}
	vlas.dgemm(false, false, a.m, b.n, a.n, alpha, a.data, a.m, b.data, b.m, 0.0, mut
		c.data, c.m)
}

Install dependencies

Debian/Ubuntu GNU Linux

libopenblas-dev is not needed when using the pure V backend.

sudo apt-get install -y --no-install-recommends \
    gcc \
    gfortran \
    liblapacke-dev \
    libopenblas-dev \

Arch Linux/Manjaro GNU Linux

The best way of installing OpenBlas/LAPACK is using openblas-lapack.

yay -S openblas-lapack

or

git clone https://aur.archlinux.org/openblas-lapack.git /tmp/openblas-lapack
cd /tmp/openblas-lapack
makepkg -si