Am 13.12.2015 um 14:09 schrieb Graham Breed: > On 13/12/15 12:48, N. Andrew Walsh wrote: >> Take a look at conversions.ly (sorry; mround is the equivalend >> function in >> the spreadsheet I use to do the same thing). Those functions will >> convert >> the input (given as a fraction comprising two integers) into Lily's >> semitone values. That should allow you to convert between >> just-intonation >> ratios an the nearest note name. Urs has some comments in there >> explaining >> a bit how it works. > > Converting from ratios to cents is easy. Converting between ratios > and cents requires a function from cents to ratios. That's a lot more > difficult because information is lost. You got us excited by > suggesting that had been solved.
Well, this is because conversion from cent to ratio isn't part of the objective currently. And as it is not a part of Andrews thinking as a composer he didn't think of a possible ambiguity here ... While I wouldn't object integrating the other direction of the conversion in a library I'd say it's currently not on the agenda, as we're solely discussing ways to display pitches that are conceived as ratios over fundamentals. >From that perspective cent values are not actual data but rather results, and even stricter: a compromise to incorporate data in the tempered notation system most instrument(alist)s are used to. Urs > > > Graham > > _______________________________________________ > lilypond-user mailing list > lilypond-user@gnu.org > https://lists.gnu.org/mailman/listinfo/lilypond-user _______________________________________________ lilypond-user mailing list lilypond-user@gnu.org https://lists.gnu.org/mailman/listinfo/lilypond-user
