Anything that can produce different results at different times can be "changed" by 13 : to produce a result obtained when it was running.
For example: 13 :'fread ''file.txt''' -- Raul On Wed, Oct 17, 2018 at 6:30 PM Jose Mario Quintana <[email protected]> wrote: > > I am aware that executing code with ". relying on explicit context can trip > 13 : , for instance, > > u=. 3 : '".''+:y''' > > u 5 > > 10 > > v=. 13 : '".''+:y''' > > v 5 > > 2 > > v > > 2: > > I am not quite sure but probably there are more glitches, according to, > > NuVoc 13 : > https://code.jsoftware.com/wiki/Vocabulary/com#m13 > > "If you get exotic, you may encounter a bug or two in the implementation of 13 > :" > > > > On Wed, Oct 17, 2018 at 1:39 PM Martin Kreuzer <[email protected]> wrote: > > > José - > > > > Thanks for pointing out that issue in the first place. > > > > I wasn't aware of the compiler module being overzealous sometimes ... > > > > Are there any other known (I'm fighting for > > words, might I call them) 'glitches' comparable to this one, and > > where would they be documented for lookup..? > > > > -M > > > > At 2018-10-17 16:25, you wrote: > > > > >Martin, > > > > > >In my example, using + instead of -, u was the double of a single roll and > > >v was the sum of two "independent" rolls. > > > > > >Yours is a far better example for illustrating the issue, > > > > > > ( u=. 3 : ' T - (T=. ? y)' ) > > >3 : ' T - (T=. ? y)' > > > > > >u is one roll minus itself which produces zeroes; whereas > > > > > > ( v=. 13 : ' T - (T=. ? y)' ) > > >? - ? > > > > > >is the difference of two "independent" rolls. > > > > > >Thus, for example, > > > > > > u 0 0 0 0 0 > > >0 0 0 0 0 > > > > > >whereas, > > > > > > v 0 0 0 0 0 > > >_0.0389238 0.321837 0.0862073 0.552116 _0.134629 > > > > > >Thanks! I had one of those moments after I read your posts... Why did I > > >not think of that? :) > > > > > > > > >On Wed, Oct 17, 2018 at 8:08 AM Martin Kreuzer <[email protected]> > > wrote: > > > > > > > Addendum: > > > > > > > Consider, in contrast, the behaviour of this *explicit* definition: > > > > > > > ee=. 3 : 'T - T=. ?y' > > > > ee 10+i.7 > > > > 0 0 0 0 0 0 0 > > > > > > > Same result as working *outside* a verb definition: > > > > > > > ] T=. ? 10+i.7 > > > > 6 6 0 9 12 1 5 > > > > T - T > > > > 0 0 0 0 0 0 0 > > > > > > > -M > > > > > > > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
