Hi Darek,
I believe the problems below should be fixed in SVN 562:
∘.{⍺×⍵}/ (5 2) (7 6 4)
35 30 20
14 12 8
K { { ⍺ ∘.{| ⍺ - ⍵ + 0J1} ⍵}/ {⍵/⍳⍴⍵}¨⍺ ⍵} L←K←1 1
0 1
1 1.414213562 3.16227766
1.414213562 1 2.236067977
3.16227766 2.236067977 1
Thanks for reporting them,
/// Jürgen
On 03/06/2015 12:54 PM, Darek Cidlinsky
wrote:
Ave,
I have two problems with outer product in GNU APL; one of them is maybe a bug, the other is nearly definitely a bug.
If I use the product with a standard function like ×, everything works as it should:
∘.×/ (5 2) (7 6 4)
35 30 20
14 12 8
However, if I replace it with a custom function, it does something different:
∘.{⍺×⍵}/ (5 2) (7 6 4)
35
It does the exactly same thing with custom non-lambda functions
P ← {⍺×⍵}
∘.P/ (5 2) (7 6 4)
35
I have only little experience with APL (30 hours), but I think that all functions are created equal (I hope so!), and the both products above should be same. (If it's a valid behaviour, -- a feature, not a bug -- I'd be grateful if you could explain it to me.)
[ If I envelope the whole product in a lambda, it works again:
{⍺ ∘.{⍺×⍵} ⍵}/ (5 2) (7 6 4)
35 30 20
14 12 8
]
Now for the sure bug: the _expression_ (for two bit vectors K and L -- it doesn't seem to depend on their contents or shapes)
K { { ⍺ ∘.{| ⍺ - ⍵ + 0J1} ⍵}/ {⍵/⍳⍴⍵}¨⍺ ⍵} L
was supposed to get the positions of 1s in both vectors ( {⍵/⍳⍴⍵}¨⍺ ⍵ , and do an outer product of these position lists using a function " sqrt(difference^2 + 1) ". However, it says
copying: '0' at Executable.cc:627
tidx: '2' at Executable.cc:628
----------------------------------------
-- Stack trace at Executable.cc:629
----------------------------------------
0x7f8af60cfb45 __libc_start_main
0x43b425 main
0x53909d Workspace::immediate_execution(bool)
0x474365 Command::process_line()
0x46e1d0 Command::do_APL_expression(UCS_string&)
0x4811c4 StatementList::fix(UCS_string const&, char const*)
0x480030 Executable::setup_lambdas()
0x5290af UserFunction::UserFunction(Fun_signature, UCS_string const&, UCS_string const&, Token_string const&)
0x480030 Executable::setup_lambdas()
0x5290af UserFunction::UserFunction(Fun_signature, UCS_string const&, UCS_string const&, Token_string const&)
0x47fffe Executable::setup_lambdas()
0x47ec2f Executable::extract_lambda_text(Fun_signature, int) const
========================================
and exits (with state of 0). I think it shouldn't do that.
[ But if I omit the {⍵/⍳⍴⍵}¨⍺ ⍵ and give some vector literals instead, it works as intended:
{⍺∘.{|⍺-⍵+0J1}⍵}/ (5 2) (7 6 4)
2.236067977 1.414213562 1.414213562
5.099019514 4.123105626 2.236067977
]
Optime vale,
D.
P. S.: This behaviour is exhibited by the Debian package (apl_1.4-1_amd64.deb) as well as by the source in Svn repository.
P. P. S.: I switched on all 41 logging facilites and ran it again. The resulting log should be attached.
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