/usr/share/libctl/base/matrix3x3.scm is in libctl5 3.2.2-2.
This file is owned by root:root, with mode 0o644.
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; Copyright (C) 1998-2014 Massachusetts Institute of Technology and Steven G. Johnson
;
; This library is free software; you can redistribute it and/or
; modify it under the terms of the GNU Lesser General Public
; License as published by the Free Software Foundation; either
; version 2 of the License, or (at your option) any later version.
;
; This library is distributed in the hope that it will be useful,
; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
; Lesser General Public License for more details.
;
; You should have received a copy of the GNU Lesser General Public
; License along with this library; if not, write to the
; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
; Boston, MA 02111-1307, USA.
;
; Steven G. Johnson can be contacted at stevenj@alum.mit.edu.
; ****************************************************************
; matrix3x3 and associated functions (a type to represent 3x3 matrices)
; we represent a matrix3x3 by a vector of 3 columns, each of which
; is a 3-vector.
(define (matrix3x3 c1 c2 c3)
(vector c1 c2 c3))
(define cmatrix3x3 matrix3x3)
(define (matrix3x3? m)
(and (vector? m)
(= (vector-length m) 3)
(vector-for-all? m vector3?)))
(define (real-matrix3x3? m)
(and (matrix3x3? m) (vector-for-all? m real-vector3?)))
(define (matrix3x3-col m col)
(vector-ref m col))
(define (matrix3x3-ref m row col)
(vector-ref (matrix3x3-col m col) row))
(define (matrix3x3-row m row)
(vector3 (matrix3x3-ref m row 0)
(matrix3x3-ref m row 1)
(matrix3x3-ref m row 2)))
(define (matrix3x3-transpose m)
(matrix3x3
(matrix3x3-row m 0)
(matrix3x3-row m 1)
(matrix3x3-row m 2)))
(define (matrix3x3-conj m) (vector-map vector3-conj m))
(define (matrix3x3-adjoint m) (matrix3x3-conj (matrix3x3-transpose m)))
(define (matrix3x3+ m1 m2)
(vector-map vector3+ m1 m2))
(define (matrix3x3- m1 m2)
(vector-map vector3- m1 m2))
(define (matrix3x3-scale s m)
(vector-map (lambda (v) (vector3-scale s v)) m))
(define (matrix3x3-mv-mult m v)
(vector3 (vector3-dot (matrix3x3-row m 0) v)
(vector3-dot (matrix3x3-row m 1) v)
(vector3-dot (matrix3x3-row m 2) v)))
(define (matrix3x3-vm-mult v m)
(vector3 (vector3-dot (matrix3x3-col m 0) v)
(vector3-dot (matrix3x3-col m 1) v)
(vector3-dot (matrix3x3-col m 2) v)))
(define (matrix3x3-mm-mult m1 m2)
(matrix3x3
(vector3 (vector3-dot (matrix3x3-row m1 0) (matrix3x3-col m2 0))
(vector3-dot (matrix3x3-row m1 1) (matrix3x3-col m2 0))
(vector3-dot (matrix3x3-row m1 2) (matrix3x3-col m2 0)))
(vector3 (vector3-dot (matrix3x3-row m1 0) (matrix3x3-col m2 1))
(vector3-dot (matrix3x3-row m1 1) (matrix3x3-col m2 1))
(vector3-dot (matrix3x3-row m1 2) (matrix3x3-col m2 1)))
(vector3 (vector3-dot (matrix3x3-row m1 0) (matrix3x3-col m2 2))
(vector3-dot (matrix3x3-row m1 1) (matrix3x3-col m2 2))
(vector3-dot (matrix3x3-row m1 2) (matrix3x3-col m2 2)))))
(define (matrix3x3* a b)
(cond
((number? a) (matrix3x3-scale a b))
((number? b) (matrix3x3-scale b a))
((vector3? a) (matrix3x3-vm-mult a b))
((vector3? b) (matrix3x3-mv-mult a b))
(else (matrix3x3-mm-mult a b))))
(define (matrix3x3-determinant m)
(-
(+ (* (matrix3x3-ref m 0 0) (matrix3x3-ref m 1 1) (matrix3x3-ref m 2 2))
(* (matrix3x3-ref m 0 1) (matrix3x3-ref m 1 2) (matrix3x3-ref m 2 0))
(* (matrix3x3-ref m 1 0) (matrix3x3-ref m 2 1) (matrix3x3-ref m 0 2)))
(+ (* (matrix3x3-ref m 0 2) (matrix3x3-ref m 1 1) (matrix3x3-ref m 2 0))
(* (matrix3x3-ref m 0 1) (matrix3x3-ref m 1 0) (matrix3x3-ref m 2 2))
(* (matrix3x3-ref m 1 2) (matrix3x3-ref m 2 1) (matrix3x3-ref m 0 0)))))
(define (matrix3x3-inverse m)
(matrix3x3-scale
(/ (matrix3x3-determinant m))
(matrix3x3
(vector3
(- (* (matrix3x3-ref m 1 1) (matrix3x3-ref m 2 2))
(* (matrix3x3-ref m 1 2) (matrix3x3-ref m 2 1)))
(- (* (matrix3x3-ref m 1 2) (matrix3x3-ref m 2 0))
(* (matrix3x3-ref m 1 0) (matrix3x3-ref m 2 2)))
(- (* (matrix3x3-ref m 1 0) (matrix3x3-ref m 2 1))
(* (matrix3x3-ref m 1 1) (matrix3x3-ref m 2 0))))
(vector3
(- (* (matrix3x3-ref m 2 1) (matrix3x3-ref m 0 2))
(* (matrix3x3-ref m 0 1) (matrix3x3-ref m 2 2)))
(- (* (matrix3x3-ref m 0 0) (matrix3x3-ref m 2 2))
(* (matrix3x3-ref m 0 2) (matrix3x3-ref m 2 0)))
(- (* (matrix3x3-ref m 0 1) (matrix3x3-ref m 2 0))
(* (matrix3x3-ref m 0 0) (matrix3x3-ref m 2 1))))
(vector3
(- (* (matrix3x3-ref m 0 1) (matrix3x3-ref m 1 2))
(* (matrix3x3-ref m 1 1) (matrix3x3-ref m 0 2)))
(- (* (matrix3x3-ref m 1 0) (matrix3x3-ref m 0 2))
(* (matrix3x3-ref m 0 0) (matrix3x3-ref m 1 2)))
(- (* (matrix3x3-ref m 1 1) (matrix3x3-ref m 0 0))
(* (matrix3x3-ref m 1 0) (matrix3x3-ref m 0 1)))))))
; ****************************************************************
; Return the rotation matrix for rotating by theta around axis:
(define (rotation-matrix3x3 axis theta)
(matrix3x3
(rotate-vector3 axis theta (vector3 1 0 0))
(rotate-vector3 axis theta (vector3 0 1 0))
(rotate-vector3 axis theta (vector3 0 0 1))))
; ****************************************************************
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