Re: Error using Manpulate that is NOT obvious (to me)

*To*: mathgroup at smc.vnet.net*Subject*: [mg96754] Re: Error using Manpulate that is NOT obvious (to me)*From*: "Sjoerd C. de Vries" <sjoerd.c.devries at gmail.com>*Date*: Tue, 24 Feb 2009 05:44:05 -0500 (EST)*References*: <gntsab$rh6$1@smc.vnet.net>

Hi Benjamin, The following will work: DynamicModule[{f, m, s, sd = {"C", "C#", "D", "D#", "E", "F", "F#", "G", "G#", "A", "A#", "B"}, pt, p, o}, Manipulate[ f = N[(440/64) 2^((m + 3)/12)]; s = m - 60; pt = Mod[m, 12]; p = sd[[pt + 1]]; o = Floor[m/12] - 1; "MIDI Note Number (0-127)" <> ToString[m] <> " equals " <> ToString[f] <> " Hertz (8-12600)" <> ", and its SoundNote number (-60 to 67) is " <> ToString[s] <> ", which has the Pitch name of (C to B) " <> ToString[p] <> " in Octave (-1 to 9) " <> ToString[o] <> ".", {m, 0, 127, 1}, SaveDefinitions -> True ] ] I've made several changes, some essential, some a matter of style or efficiency. 1. Removed the Print function, which printed to the Message box. The result of the last of a series of concatenated statements is shown as the result of the Manipulate body. It's now one string using the StringJoin (<>) and the ToString functions 2. You used Integer to make the result of the division integer. You should use Round, Floor, Ceiling or the integer division Quotient for that use. 3. The DynamicModule now surrounds the Manipulate instead of the other way around 4. Constants (sd) should not be re-assigned again and again 5. Instead of writing pt = Mod[m, 12]; p = sd[[pt + 1]] you could have used the slightly more elegant pt = Mod[m, 12,1]; p = sd [[pt]]; Cheers -- Sjoerd On Feb 23, 12:03 pm, brt... at pdmusic.org wrote: > Using Mathematica 6.0.2, I can't get this relatively straight forward cod= e to > work, Can anyone explain what's wrong and how to fix it. It's > essentially intended to be musician utility for using the SoundNote > function which I hope to further elaborate by also converting any > (MIDI note range frequency) into the appropriate MIDI note number and > pitch bend values assumming a fine tuning RPN range of +/- 1 semitone, > allowing 100 cents "sensitivity" to be defined. > > Manipulate[ > DynamicModule[{f, m, s, sd, pt, p, o}, > f = N[(440/64) 2^((m + 3)/12)]; > sd = {"C", "C#", "D", "D#", "E", "F", > "F#", "G", "G#", "A", "A#", "B"}; > s = m - 60; > pt = Mod[m, 12]; > p = sd[[pt + 1]]; > o = Integer[m/12] - 1; > Print[ > "MIDI Note Number (0-127)", m, > " equals ", f, " Hertz (8-12600)", > ", and its SoundNote number (-60 to 67) is ", s, > ", which has the Pitch name of (C to B) ", p, > " in Octave (-1 to 9) ", o, "." > ] > ], > {m, 0, 127, 1}, > SaveDefinitions -> True > ] > > Benjamin Tubb > using Mathematica 6.0.2 > and still occasionally v3.0.1 <g>