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Re: [Bug-apl] ISO Monadic Quad-FX

From: Louis de Forcrand
Subject: Re: [Bug-apl] ISO Monadic Quad-FX
Date: Sun, 26 Jun 2016 11:34:29 +0200

Ah I see where the one comes from now.
This seems like better behaviour than just
signalling domain error as in the standard.
Works as intended!


On 26 Jun 2016, at 11:18, Juergen Sauermann <address@hidden> wrote:

Hi Louis,

the IBM APL2 reference p. 292 says:

Invalid Definition: If the definition is not valid, Z is a scalar integer indicating the
first row of the function or operator line in error. This integer is dependent on ⎕IO.

I believe the equivalence mentioned in the ISO standard is only valid when the
function definition C is valid.

/// Jürgen

On 06/26/2016 03:04 AM, Louis de Forcrand wrote:
I've been browsing through the system functions in the standard,
and found a (somewhat negligible) inconsistency in GNU APL's
implementation of monadic ⎕FX.

Shouldn't this use of ⎕FX:
- define a monad TEST
- return 'TEST'

      ⎕FX ⊃'∇Z←TEST X' '⎕←"hi"' 'Z←X∇'
      TEST 5
      TEST 5
Clearly ⎕CR ⎕FX C yields an error as well, while the standard
states that it should be equivalent to C (which is a well-formed
character matrix) on page 203. In addition, AFAIK GNU APL's
⎕FX returns 1 no matter what I feed it. Maybe my character
matrix is ill-formed?
Yes, I should remove the del characters. Then ⎕FX works as
described in the standard, except when it should signal errors.
Unless the returned 1 is intended behaviour?


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