On Sat, Oct 6, 2012 at 4:49 PM, Walter Pachl
<christel.u.w.pa...@chello.at>wrote:
> Before I enter another invalid bug
> (is 1122 really invalid? Why does makestring not use the required string
> value of objects
> and is the use of null string worth documenting?)
>
Obviously you didn't learn a lesson from the previous discussion. The only
way you can get this fixed is to open a bug report. Whether you do or not
is your decision.
>
> here is a little program and 2 questions:
> Q1: Why is 1 A in relation r12 (it is in r2)
>
There are two (1,A) pairs in r1, only one in r2, so the difference only
removes one of those.
> Q2: Why is r1a identical to r1 (is array's index 1 not the same as
> relation's index 1?)
>
This is the general principle described in section 5.3.19.4, Since the
array is an ordered collection, it is coerced into a map collection by
using the array items for both the index and item. Thus the matching pairs
are (A,A), (B,B), and (E,E), so no items are removed.
Rick
>
> 5.3.13.10. difference
> >>-difference(argument)----------------------------------------><
> Returns a new Relation containing only those items that the argument
> collection does not contain (with
> the same associated index). (Q1)
> The argument can be any collection class object. (Q2)
>
> r1=.relation~new ;r1[1]='A'; r1[2]='B'; r1[3]='C'; r1[1]='A'
> r2=.relation~new ;r2[1]='A'; r2[2]='B'; r2[3]='E'
> Call show_relation 'r1',r1 -- r1 / 1 A / 2 B / 3 C / 1 A
> Call show_relation 'r2',r2 -- r2 / 1 A / 2 B / 3 E
> r12=r1~difference(r2);
> Call show_relation 'r12',r12 -- r12 / 1 A / 3 C
> a2=.array~new ;a2[1]='A'; a2[2]='B'; a2[3]='E'
> r1a=r1~difference(a2);
> Call show_relation 'r1a',r1a -- r1a / 1 A / 2 B / 3 C / 1 A
> Exit
> show_relation: Procedure
> Use Arg tag,r
> s=r~supplier
> Call show_supplier tag,s
> Return
>
> show_supplier: Procedure
> Use Arg tag,s
> ol=tag
> do while s~available
> ol=ol '/' s~index s~item
> s~next
> End
> Say ol
> Return
>
>
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