From 7ae4f2f25c9264111a9bd19ac5b3c953dec6d330 Mon Sep 17 00:00:00 2001
From: Marlon Schumacher <schumacher@hfm-karlsruhe.de>
Date: Fri, 28 Mar 2025 04:02:01 +0100
Subject: [PATCH] Merge tag '0.1.0' into develop
---
sources/SRR.lisp | 136 +++++++++++++++++++++++++++++++++++++++++++++
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+; ****************************************************************
+; | OM-SRR, 2023-2025 M.Schumacher |
+; | |
+; | Library for spectral rhythm modeling via integer time ratios |
+; | (partials) as phase-aligned amplitude modulations. |
+; | |
+; | See https://steffenkrebber.de/research/sinusoidal-run-rhythm/|
+; ****************************************************************
+;
+;This program is free software; you can redistribute it and/or
+;modify it under the terms of the GNU General Public License
+;as published by the Free Software Foundation; either version 2
+;of the License, or (at your option) any later version.
+;
+;See file LICENSE for further informations on licensing terms.
+;
+;This program 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 General Public License for more details.
+;
+;You should have received a copy of the GNU General Public License
+;along with this program; if not, write to the Free Software
+;Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,10 USA.
+;
+;Authors: M. Schumacher
+
+(in-package :om)
+
+
+
+; GEN-PARTIAL
+
+(defmethod! gen-partial (subdivision &key (precision 0.01) (decimals 5))
+
+ :icon 988
+ :initvals '(2 0.01 5)
+ :indoc '("subdivision" "precision" "decimals")
+ :numouts 2
+
+ (let* ((sampled-function (multiple-value-list
+ (om-sample #'cos (* subdivision precision) 0 (* subdivision (* 2 pi)) decimals)))
+ (x-points (second sampled-function))
+ (y-points (third sampled-function)))
+
+ (values (om/ x-points subdivision) y-points)
+ )
+ )
+
+; example
+
+; (gen-partial 8)
+
+
+; GEN-SRR
+
+(defmethod! gen-srr (&rest subdivisions)
+
+ :icon 988
+ :initvals '(nil)
+ :indoc '("subdivisions")
+ :numouts 2
+ (let ((valuelist (mat-trans
+ (loop for sub in subdivisions
+ collect (multiple-value-list (gen-partial sub))))))
+
+
+ (values (caar valuelist)
+ (om* (expt 0.5 (length subdivisions))
+ (om+ (length subdivisions) ;(apply 'om+ (second valuelist)))))
+ (loop for i from 0 to (1- (length (car (second valuelist))))
+ collect (reduce '+ (loop for list in (second valuelist) collect (nth i list)))
+ ))
+ )
+ )
+ )
+ )
+
+; legacy method
+
+(defmethod! gen-srr_2 (subdivision1 subdivision2 &key (precision 0.01) (decimals 5))
+
+ ;:icon 141
+ ;:initvals '(0 0.1 5)
+ ;:indoc '("subdivision" "sampling-factor" "decimals")
+ :numouts 2
+
+ (let* ((pointlist1 (multiple-value-list (gen-partial subdivision1 :precision precision :decimals decimals)))
+ (pointlist2 (multiple-value-list (gen-partial subdivision2 :precision precision :decimals decimals)))
+ )
+ (values (first pointlist1)
+ (om* 0.25 (om+ 2 (om+ (second pointlist1) (second pointlist2))))
+ )
+ )
+ )
+
+
+; polar-plot
+
+(defmethod! polar-plot ((srr bpf))
+ :icon 988
+ (let* ((xpoints (x-points srr))
+ (ypoints (y-points srr))
+ (x-factor (/ 360.0 (* 2 pi)))
+ (polar-values (multiple-value-list (ad->xy (om* x-factor xpoints) ypoints))))
+ (simple-bpf-from-list (first polar-values) (second polar-values) 'bpc (decimals srr))
+ )
+ )
+
+
+
+; output the object or the point lists
+; optionally output cartesian or polar representation
+
+
+; Computation of Farey-Sequence
+; A Farey sequence of order n is the sequence of irreducible fractions between 0 and 1 that have denominators less than or equal to n, arranged in increasing order.
+
+(defun farey-sequence (n)
+ "Compute the Farey sequence of order n."
+ (let ((fractions '()))
+ (loop for denominator from 1 to n
+ do (loop for numerator from 1 to denominator
+ when (and (>= numerator 0) (<= numerator denominator)
+ (= 1 (gcd numerator denominator)))
+ do (push (cons numerator denominator) fractions)))
+ (sort fractions (lambda (a b)
+ (let ((num-a (car a)) (den-a (cdr a))
+ (num-b (car b)) (den-b (cdr b)))
+ (< (* num-a (float den-b)) (* num-b (float den-a))))))
+ ))
+
+;; Example usage
+(print (farey-sequence 5))
+(farey-sequence 5)
+
--
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