There's a checkbox for x. y. etc. as well as x y ...
Options... (Preferences, on Mac) > tab:Parameters > [*] Permit x. y. names
in explicit definitions.
I guess that's equivalent to Bill's (9!:49)1 phrase.
On Fri, Jan 3, 2014 at 6:52 AM, Nollaig MacKenzie <noll...@amhuinnsuidhe.net
> wrote:
> I expect that the problem arises because older versions of J
> required 'x.', 'y.', 'u.', where current versions want plain
> 'x', 'y', 'u'. Try replacing the "dotted" letters with unmodified
> ones. HTH, N.
>
> On 2014.01.03 00:34:01, you,
> the extraordinary Daniel Valentino, spake thus:
>
> >
> > I am very new to J, and not very experienced with functional programming,
> > but I am trying to use J for a data analytics project that involves a lot
> > of statistical analysis. In learning to program in J, I started to run
> > some of the examples from Ken Iverson's Calculus book, and I'm having
> > trouble with the following:
> > PS =: 1 : (':'; '(u. x.) p. y.') NB. explicit definition of power
> series
> >
> > On my system, it reports an error: "spelling error" with the caret under
> > the u. I found the u. operator in the dictionary, and it appears to be a
> > unicode operator, but it doesn't appear to be defined in my J
> interpreter.
> >
> > I tried the following:
> > s1 =: $&(0 1)
> > x =: (i.6)%2
> >
> > 5 s1 PS x
> >
> > x1 and x appear to be defined correctly, but I get the "spelling error"
> > message when I use the PS operator:
> >
> > spelling error
> > | (u. x.) p. y.
> > | ^
> > | PS=: 1 :(':';'(u. x.) p. y.')
> >
> > I am using J version j64-701gtk on Windows 7, SP1, 64 bit (intel i7).
> >
> > Is this an appropriate question for this forum, or should I post this
> > message elsewhere? If it is appropriate, can someone help me to
> understand
> > the definition of the PS operator, and does anyone recognize why I'm
> > getting the reported error?
> >
> > Thanks in advance for any help!
> >
> > Sincerely,
> > Daniel
> > ----------------------------------------------------------------------
> > For information about J forums see http://www.jsoftware.com/forums.htm
>
> --
> Nollaig MacKenzie
> http://www.yorku.ca/nollaig
> ----------------------------------------------------------------------
> For information about J forums see http://www.jsoftware.com/forums.htm
>
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