I've been working on the puzzle from Dr. Dobbs that
Randy MacDonald announced here:
http://www.jsoftware.com/pipermail/chat/2007-April/000467.html
I'm still not ready for full-fledged spoilers, but I
am asking for help getting past one particular error
condition. The problem is that an index error is
reported when I try to load the script, but it seems
fine when I run it in the J console.
My approach to solving the puzzle is:
reportstates same_chars same_tallies 4 comb 50
I've only developed this as deep as verb same_tallies,
which is:
same_tallies =: ((tally_leftpairs = tally_rightpairs)
y.) # y.
Here are the component verbs:
tally_leftpairs =: 3 : '+/"1 (0 1 {"1 ((i.#y.) { y.))
{ tallies'
tally_rightpairs =: 3 : '+/"1 (2 3 {"1 ((i.#y.) { y.))
{ tallies'
Now I'll show testing from a J session, ending with an
error on attempt to load the same verb that functioned
perfectly when entered in the console:
twocomb =: 0 1 11 14 ,: 4 5 6 20
twocomb
0 1 11 14
4 5 6 20
twocomb { states
+----------+--------+-----------+-------------+
|Alabama |Alaska |Idaho |Iowa |
+----------+--------+-----------+-------------+
|California|Colorado|Connecticut|Massachusetts|
+----------+--------+-----------+-------------+
twocomb { tallies
7 6 5 4
10 8 11 13
(0 1 {"1 ((i.#twocomb) { twocomb)) { tallies
7 6
10 8
(2 3 {"1 ((i.#twocomb) { twocomb)) { tallies
5 4
11 13
+/"1 (0 1 {"1 ((i.#twocomb) { twocomb)) { tallies
13 18
+/"1 (2 3 {"1 ((i.#twocomb) { twocomb)) { tallies
9 24
load 'c:\j504\user\miscellany\statespzl2.ijs'
|index error: tally_rightpairs
| +/"1(2 3 {"1((i.#y.){y.)){tallies
No error was signaled for the line before it, which
differed only in the values of the pairing noun:
tally_leftpairs =: 3 : '+/"1 (0 1 {"1 ((i.#y.) { y.))
{ tallies'
tally_rightpairs =: 3 : '+/"1 (2 3 {"1 ((i.#y.) { y.))
{ tallies'
I'm at a loss as to what needs to be fixed, here.
--
Tracy B. Harms
It is the central thesis of this book that the descriptive
and analytic power of an adequate programming language amply
repays the considerable effort required for its mastery.
Kenneth E. Iverson
A Programming Language, 1962
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