[Jprogramming] typo in concrete math companion, ([.)

[R.E. Boss]

In http://www.jsoftware.com/jwiki/PrimitivePrimitives substitutes are
defined.


R.E. Boss


> -----Oorspronkelijk bericht-----
> Van: programming-bounces at jsoftware.com [mailto:programming-
> bounces at jsoftware.com] Namens R.E. Boss
> Verzonden: donderdag 9 februari 2012 12:26
> Aan: 'Programming forum'
> Onderwerp: Re: [Jprogramming] typo in concrete math companion, ([.)
> 
> see http://www.jsoftware.com/help/release/status.htm#4.05 when [. and ].
> were introduced and http://www.jsoftware.com/help/release/noncpat.htm
> where
> they were removed.
> 
> 
> R.E. Boss
> 
> 
> > -----Oorspronkelijk bericht-----
> > Van: programming-bounces at jsoftware.com [mailto:programming-
> > bounces at jsoftware.com] Namens Bo Jacoby
> > Verzonden: donderdag 9 februari 2012 12:12
> > Aan: Programmingforum
> > Onderwerp: [Jprogramming] typo in concrete math companion, ([.)
> >
> >
> >
> > http://www.jsoftware.com/books/pdf/cmc.pdf chapter 5, page 44, says
> >
> > The binomial theorem expresses a power of a sum (that is, (x+y)^t) as an
> > equivalent
> > weighted sum of products of ascending powers of x and descending
> powers
> > of y:
> >     x=: 3 [ y=: 5 [ t=: 4 [. Ei=: i.@>:
> >
> > I didn't understand [. , nor did the interpreter.
> >
> > |spelling error
> > |   x=: 3 [ y=: 5 [ t=: 4 [. Ei=: i.@>:
> > |                         ^
> >
> >
> > I guessed that is was supposed to say
> >    x=: 3 [ y=: 5 [ t=: 4 [ Ei=: i.@>:
> > but that doesn't work either:
> >    x
> > 3 [ (5 [ (4 [ (i.@>:)))
> >    y
> > 5 [ (4 [ (i.@>:))
> >    t
> > 4 [ (i.@>:)
> >    Ei
> > i.@>:
> >
> >
> > - Bo
> > ----------------------------------------------------------------------
> > For information about J forums see
> http://www.jsoftware.com/forums.htm
> 
> ----------------------------------------------------------------------
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