Re: [Bug-apl] Recursive Lambda

[Christian Robert]

If no one noticed, it is a way to do (if;then;else) in a Lambda. (if;then;else) 
everywhere in fact.

Xtian.

On 2016-07-05 01:43, Christian Robert wrote:
> I was under the impression that recursive controlled Lambda was near impossible 
> to write.
>
> here an example for factorial:
>
>
>       fact←{⍎↑(⍵>2)↓⌽ '⍵ × fact ⍵-1' '1⌈⍵'}
>
>       fact 10
> 3628800
>       fact 2
> 2
>       fact 1
> 1
>       fact 0
> 1
>       fact 14
> 87178291200
>       !14
> 87178291200
>
>
> This IDIOM, from the 80's, can do that. What is in (...) is the condition and 
> it will execute
> the first statement if true, else the second one.
>
> for your eyes,
>
> Xtian.