/usr/share/doc/ruby-gsl/examples/linalg/PTLQ.rb is in ruby-gsl 2.1.0.3+dfsg1-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 | #!/usr/bin/env ruby
require("gsl")
include GSL
m = Matrix::alloc([0.18, 0.60, 0.57, 0.96], [0.41, 0.24, 0.99, 0.58],
[0.14, 0.30, 0.97, 0.66], [0.51, 0.13, 0.19, 0.85])
m.transpose!
lq, tau = m.PTLQ_decomp
p lq.class
p tau.class
b = Vector[1, 2, 3, 4]
lq, tau, p = m.PTLQ_decomp
p Linalg::PTLQ.solve_T(lq, tau, p, b)
p Linalg::PTLQ.solve_T(m, b)
p m.PTLQ_solve_T(b)
p lq.PTLQ_solve_T(tau, p, b)
p m.PTLQ_solve_T(b)
bb = b.clone
p Linalg::PTLQ.solve_T(lq, tau, p, bb)
bb = b.clone
p Linalg::PTLQ.solve_T(m, bb)
bb = b.clone
p m.PTLQ_solve_T(b)
bb = b.clone
p lq.PTLQ_solve_T(tau, p, bb)
bb = b.clone
p m.PTLQ_solve_T(bb)
bb = b.clone
p lq.class
p lq.solve_T(tau, p, bb)
q, l, tau, p = m.PTLQ_decomp2
p q.class
p l.class
p Linalg::PTLQ.LQsolve_T(q, l, p, b)
bb = b.clone
lq.svx_T(tau, p, bb)
p bb
bb = b.clone
m.PTLQ_svx_T(bb)
p bb
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