Re: [Bug-apl] ERR function in APL2?

[Elias Mårtenson]

Thank you. I see now how it works. Personally, I'd use Quad-ES to set an error state instead. Was Quad-ES available on APL2?

Regards,

Elias

On 5 August 2014 01:42, Juergen Sauermann <address@hidden> wrote:

Hi Elias,

ERR is indeed a function, defined on page 49 of that document.

/// Jürgen

On 08/04/2014 08:13 AM, Elias Mårtenson wrote:

I was browsing the APL2 documentation, and came across the following code (page 56, on the PDF here):

[0]  Z←NAME GETW N

[1] ⍝ GET ITEMS N FROM THE TABLE NAMED NAME

[2]  Z←''

[3]  →('NOT A VALID TABLE NAME' ERR~(⊂NAME)∊TABLES)/0

[4]  TAB←⍎NAME

[5]  B←N∊TAB[;1]

[6]  →0ρ('ITEM(S)'((~B)/N)'NOT FOUND')ERR~^/B

[7]  →(~∨/B)/0  ⍝ EXIT IF NONE FOUND

[8]  Z←(TAB[;1]∊N)⌿›TAB

What is ERR here?  It seems like a function that sets some error state? It certainly looks like something useful to have. I can't think of any way I could build this myself though.

Regards,

Elias