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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[]?


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