#502 genmatrix/lambda translate problem

closed
nobody
5
2008-07-03
2004-01-29
No

f():=genmatrix(lambda([i,j],3),1,1)
f() => matrix([3]) OK
translate(f)
f() => error

This is because genmatrix's semantics are screwy.

genmatrix allows a lambda-expression as a first argument
(undocumented), but not a named function (because it
treats symbols as array names) or a compiled function.

This violates referential transparency. It also breaks
translate. The translate case can be patched, either by
allowing translated functions as first arg (more
inconsistency!), or by having translate cons up a lambda-
expression (yuck!).

Discussion

  • Robert Dodier

    Robert Dodier - 2006-04-10
    • labels: --> Lisp Core - Translator
     
  • Barton Willis

    Barton Willis - 2008-03-02

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    The linearalgebra functions polytocompanion, toeplitz, diag_matrix, hankel, use
    genmatrix(lambda...)). So linearalgebra.mac should not be compiled :(

     
  • Barton Willis

    Barton Willis - 2008-03-07

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    See comm2.lisp cvs revision 1.20

     
  • Robert Dodier

    Robert Dodier - 2008-07-03

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    Not observed in 5.15.0 + GCL + Windows nor 5.15.0cvs + Clisp + Linux. Looks like it was fixed by r1.20 src/comm2.lisp as noted before. Closing this report as fixed.

     
  • Robert Dodier

    Robert Dodier - 2008-07-03
    • status: open --> closed
     

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