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Re: [Bug-apl] Suggestions needed: Editing of named lambdas

From: Kacper Gutowski
Subject: Re: [Bug-apl] Suggestions needed: Editing of named lambdas
Date: Thu, 6 Mar 2014 07:10:54 +0100
User-agent: Mutt/1.5.21 (2010-09-15)

On 2014-03-06 10:53:12, Elias Mårtenson wrote:
>     ∇λ←avg ⍵   
>     λ←(+/⍵)÷⍴⍵
> This will of course fail when the user tries to save the function.

I'm not using Emacs nor your mode, but why should it fail?
This works:

      ⎕FX 'λ←avg ⍵' 'λ←(+/⍵)÷⍴⍵'

And so does this:

[1] [0]λ←avg ⍵
[1] λ←(+/⍵)÷⍴⍵
[2] ∇

User can not start editing a new function writing ∇λ←avg ⍵, but there
is nothing preventing user from changing this header or making more than
one statement inside a function even if it was initially defined with
dfn syntax (so you can not assume that if it starts with λ then it has
only one statement).

This might not have been intended to work, but it does! :)

      avg ← {(+/⍵)÷⍴⍵}
[0] λ←avg ⍵
[1] λ←(+/⍵)÷⍴⍵
[2] [0] λ←avg ⍵;z
[1] z←+/⍵
[2] λ←z÷⍴⍵
[3] ∇
λ←avg ⍵;z


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