Re: Using "/@" Effectively

*To*: mathgroup at smc.vnet.net*Subject*: [mg104306] Re: Using "/@" Effectively*From*: Szabolcs Horvát <szhorvat at gmail.com>*Date*: Tue, 27 Oct 2009 04:57:58 -0500 (EST)*References*: <hc38lq$iae$1@smc.vnet.net>

On 2009.10.26. 5:30, 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? Use @@@ instead of /@, and change d_Real to d_ . "Real" means floating point number in Mathematica, so 1 is not of Real type but 1.0 is. But why don't you just use SoundNote[]?