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Re: Replace ly:music elements in a Scheme function
From: |
David Kastrup |
Subject: |
Re: Replace ly:music elements in a Scheme function |
Date: |
Mon, 05 Mar 2018 18:12:44 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/26.0.50 (gnu/linux) |
paolo prete <address@hidden> writes:
> I see.
> Then I ask if is it possible at least, by placing a simple instruction
> inside lambda (x y) ( ...) while iterating, to:
>
> 1) replace x with a rest
No.
> 2) add a list of articulations (for example: "->", "\mp") to x
Yes.
Same reason:
>> No. x and y are values stored in lists. The relation to their lists
>> is not passed into your function, so you cannot change it there.
>>
>> You'd need to use something like pair-for-each to modify the first
>> list in-place, and that gets old fast as music structures change.
>>
>> There is an actual reason functions like map-some-music are provided.
--
David Kastrup