posted 07 March 2010 22:27            

Basically, I want to algorithmically populate the amplitudes field of a Synthetic Spectrum From Array with n array elements. That's easily accomplished with something like

{ | n | n := 8. (1 to: n) collect: [:i | (1 * i inverse)]}

(which gives 8 partials with a 1/n amplitude slope)

Where it gets difficult (at least for *me*....) is when I try to add the following functionality ;-)

Basically, I want a VCS fader that interpolates between all amplitudes at 1 in the fader's middle position, the aforementioned 1/n slope at it's maximum position and the inverse of that slope at minimum position (so partial 1 gets 1/n, 2 gets 1/(n-1) and n gets 1).

So the resulting values would look something like this

1/8 <> 1 <> 1/1
1/7 <> 1 <> 1/2
1/6 <> 1 <> 1/3
...<snip>...
1/1 <> 1 <> 1/8

So far I've tried using an into: array inside the loop, kind of like this (!Slope supposedly being in the range -1...1):

{
| n |
n := 8.
(1 to: n) collect: [:i | !Slope into: #({(-1)@(1/((n+1)-i))} {0@1} {1@(1/i)})]
}

....which doesn't work and evaluates to

Error during literal evaluation ->{ | n | n := 8. (1 to: n) collect: [:i | !Slope into: #(Error during literal evaluation ->{(-1)@(1/((variable undeclared -> n+1)-i))} {0@1} {1@(1/i)})]}

So my best guess at this point is that the scope of the variable n does not extend into the into: array (and probably i doesn't "reach" the array, either...).

Which leads to the question: is it possible to pas the values of n (and i for that matter) on into the into: array? If not: any ideas of how to do the "Slope" thing differently?

Cheers!
d

posted 19 March 2010 12:56            

Perhaps you can use a second collect expression inside the first one, to construct the inner array in terms of n?

posted 19 March 2010 19:46            

code:

---

{ 
| n | 
n := 8. 
(1 to: n) collect: [:i | !Slope into: (Array with: (-1@(1/((n+1)-i))) with:  (0@1) with: (1@(1/i)))]
}

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For example, to make the Array #(1 2 3), one can instead construct it using:

Array with: 1 with: 2 with: 3.

posted 21 March 2010 11:13            

quote:

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Originally posted by SSC:
Array with: 1 with: 2 with: 3.

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This lead to a question I was just about to ask on a new thread:

I often would like to create long arrays containing expressions with variables (especially when filling MultiSample players with long lists of audiofiles, for example). I have found that when using the Array: with: with: expression, it stops working after about 35 "with:s." Is there another way to do this? Or could it be extended out to say 100 in the next version of Kyma?

posted 22 March 2010 01:47            

My next learning project: make another fader balance odd and even numbered partials.

posted 22 March 2010 10:52            

quote:

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I have found that when using the Array: with: with: expression, it stops working after about 35 "with:s." Is there another way to do this?

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You can concatenate two Arrays using the comma operator. For example:

code:

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(Array with: 1 with: 2 with: 3), (Array with: 'hi' with: 'there' with: 'brother')

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posted 22 March 2010 15:24            

quote:

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Originally posted by SSC:

code:

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(Array with: 1 with: 2 with: 3), (Array with: 'hi' with: 'there' with: 'brother')

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