score.py - ValueError: math domain error #5
Comments
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Hey Kevin! Can you post the script that's not working? It's a little hard to tell without seeing your code, but it looks like somehow it's getting a negative note length or something. |
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GitHub doesn't like Python attachments. (I suppose I could have just changed the extension, but here it is.) #!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
# "Beating the Cat"
# Decomposed by Kevin Cole <[email protected]> 2021.02.19 (kjc)
#
# Tuning info courtesy of http://www.hotpipes.com/tuning.html
#
# Sorta 6/8?
#
from random import choice, randint, shuffle, sample, uniform
from scamp import *
from scamp_extensions.pitch import Scale
s = Session(tempo=120)
woodblock = s.new_part("woodblock")
bagpipe = s.new_part("bagpipe")
bodhran = s.new_part("bodhran",
soundfont="soundfonts/Bodhran") # Bodhran.sf2
# G4 A4 B4 C#5 D5 E5 F#5 G5 A5
chanter = (67, 69, 71, 73, 74, 76, 78, 79, 81) # A4 is the "key note"
scale = Scale.from_pitches(chanter)
def rickity(duration=32, shift=0):
"""Clickity-clackity, rickity-tickity, pseudo-bones"""
pitches = ( 75, 73, 67, 77, 70, 65)
volumes = ( 0.75, 0.75, 0.75, 1.0, 0.75, 0.75)
lengths = ((1.0 / 3.0),) * 6 # 0.333333..., 0.333333..., ...
while current_clock().beat() < duration:
for pitch, volume, length in zip(pitches, volumes, lengths):
woodblock.play_note(pitch + shift, volume, length)
def boombah(duration=32):
"""Boom-bah of the bodhran"""
notes = ((60, 58, 58, 60, 58, 58),
(60, 58) * 2,
(60, 58))
vols = ((0.75, 0.75, 0.75, 1.0, 0.75, 0.75),
(1.0, 0.75,) * 2,
(1.0, 0.75))
durs = (((1.0 / 3.0),) * 6, # 0.3333..., 0.3333..., ...
((2.0 / 3.0), (1.0 / 3.0)) * 2, # 0.6666..., 0.3333..., 0.6666...
((4.0 / 3.0), (2.0 / 3.0))) # 1.3333..., 0.6666
wait(4)
while current_clock().beat() < duration:
pattern = randint(0, 2)
for note, vol, dur in zip(notes[pattern],
vols[pattern],
durs[pattern]):
bodhran.play_note(note, vol, dur)
def pipe(duration=32):
"""The pipes, the pipes, are droning"""
# Drones chord
#
drones = (57, 57, 45) # A2, A2, A3 (tenor, tenor, bass)
wait(8)
drone = bagpipe.start_chord(drones, 0.8)
wait(4)
note = choice(chanter)
while current_clock().beat() < duration:
dur = randint(1, 6) * (1.0 / 3.0)
bagpipe.play_note(note, 1.0, dur)
leading = note
while abs(note - leading) in (0, 1, 2, 3, 6, 8, 10, 11, 13, 14, 15):
note = choice(chanter)
# Deflate the bag
#
drone.end()
bagpipe.play_note([81, 76], [0.6, 0], 1.0, blocking=False)
bagpipe.play_note([57, 52], [0.6, 0], 1.0, blocking=False)
bagpipe.play_note([45, 40], [0.8, 0], 1.0)
def main():
"""The main attraction"""
s.start_transcribing()
s.fork(rickity, args=(42, 30,))
s.fork(boombah, args=(44,))
s.fork(pipe, args=(40,))
s.wait_for_children_to_finish()
if s.is_transcribing():
performance = s.stop_transcribing()
performance.to_score(title="Beating the Cat",
composer="Decomposer: Kevin Cole",
time_signature="6/8").show_xml()
if __name__ == "__main__":
main() |
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Well, I tracked down the source of the issue! You're doing something very strange by accident here: the boombah part is using triplets, but in the context of 6/8 time. This creates a weird situation for the quantizer, since it's trying to make sense of 4/3 of a quarter note within dotted-quarter-note beats. I need to fix something here for sure, but I'm guessing that the triplets may not be what you're really intending? |
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On Tue, Mar 8, 2022 at 5:15 PM MarcTheSpark ***@***.***> wrote:
Well, I tracked down the source of the issue! You're doing something very
strange by accident here: the boombah part is using triplets, but in the
context of 6/8 time. This creates a weird situation for the quantizer,
since it's trying to make sense of 4/3 of a quarter note within
dotted-quarter-note beats. I need to fix something here for sure, but I'm
guessing that the triplets may not be what you're really intending?
Given my gaps in music theory, and my tough time with rhythm, you are
almost certainly correct. 😉 I shall ponder: The rhythm produced by the
"bones" and bodhran in the playback sounds like what I want it to sound
like -- or at least, very close, to my ear -- but there's probably a better
idiom for achieving it.
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I was revisiting code that I don't recall giving this error before. I recently updated to SCAMP version 0.8.9.5.
You may recall helping me with a pseudo-Celtic random song generator. That's what's crapping out. It plays the tune, but upon finishing it yields the following when trying to generate the score:
The text was updated successfully, but these errors were encountered: