Re: Using "/@" Effectively

*To*: mathgroup at smc.vnet.net*Subject*: [mg104321] Re: [mg104292] Using "/@" Effectively*From*: Mark Perrin <m.perrin at me.com>*Date*: Tue, 27 Oct 2009 05:00:46 -0500 (EST)*References*: <200910260425.XAA18594@smc.vnet.net>

I think that instead of: Sound[melody[#1, #2] & /@ {{0, 1}, {5, 0.5}, {7, 0.5}, {12, 1}}, {0, 3}, SoundVolume -> .5], at 3:25 PM, BenT wrote: it should be: Sound[melody[#[[1]], #[[2]]] & /@ {{0, 1}, {5, 0.5}, {7, 0.5}, {12, 1}}, {0, 3}, SoundVolume -> .5] As you are mapping one list over the function, but want to insert part 1 and part 2 of each item in that list. Also the list should be: {{0, 1.0}, {5, 0.5}, {7, 0.5}, {12, 1.0}} instead of: {{0, 1}, {5, 0.5}, {7, 0.5}, {12, 1}}, {0, 3} If you are using Reals in position 2 Hope that is what you meant, Cheers, Mark Perrin On 26/10/2009, at 3:25 PM, BenT wrote: > Given: > > $Version > "7.0 for Microsoft Windows (32-bit) (January 30, 2009)" > > miditofreq[n_Integer] := (440./64) 2^((n + 3)/12); > > and > > melody[p_Integer, d_Real] := > Play[Sin[miditofreq[p] 2 \[Pi] t], {t, 0, d}, SampleRate -> 44100, > SampleDepth -> 16] > > I want to be able to use a list of pitch and duration values for a > melody, and use it like the following, but cannot determine the method > to Map them properly, as in this (non-working) attempt: > > Sound[melody[#1, #2] & /@ {{0, 1}, {5, 0.5}, {7, 0.5}, {12, 1}}, {0, > 3}, SoundVolume -> .5] > > Can anyone show me the correct (or even a better) way to do so? > > >

**References**:**Using "/@" Effectively***From:*BenT <brtubb@pdmusic.org>