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 <juergen.sauerm...@t-online.de> 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 > <http://publibfp.boulder.ibm.com/epubs/pdf/h2110720.pdf>): > > [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 > > >
