Re: [Jchat] How close is J to APL?

I'd actually say that things have moved on a bit, and now with machine learning et al so prominent, the programming paradigm of J/APL may be gaining some traction. Look at how dominant R has become! OK it's no J but there are similar concepts involved that an R programmer would benefit from

Re: [Jchat] How close is J to APL?

OK, I'll give the questions a go, too, bearing in mind that I am not a power user, just a J dilettante. How similar? - About as similar as Lua and Javascript :) !!! They may look completely different on the surface and are used differently but the underlying ideas and the paradigm

Re: [Jchat] How close is J to APL?

I prefer 0=⎕io, especially for array arithmetic, because it works well for mixed-radix indexing, which is essential for array operations. As an implementor of functional array language processors (compilers and interpreters), I do this sort of thing a lot, under the covers. Consider this nice

Re: [Jchat] How close is J to APL?

I was asking because when I tried to research the history of this issue, I found distinctions including: quaternions vs. vectors vectors vs. scalars vector notation vs. index notation roman numerals vs. arabic numerals (also the absence or presence of 0) The distinction between vector

Re: [Jchat] How close is J to APL?

I recall being astonished (circa 1974) to learn of the IBM product development group's approach to implementing BASIC regards index origin. They had a similar discussion to the one here, and decided a simple solution would be that when a user declared a (row by col) array, simply set aside

Re: [Jchat] How close is J to APL?

That would work in basic because index notation is the only way of accessing basic array elements. Of course that would not solve off-by-one errors, but those are always problems. -- Raul On Fri, May 18, 2018 at 12:31 PM, Joey K Tuttle wrote: > I recall being astonished (circa

Re: [Jchat] How close is J to APL?

I prefer index origin zero too. And I mentioned this discussion to my wife this morning she pointed out that 2d and 3d graphs always have an origin of zero. But when I first learned FORTRAN back in the stone age it only had index origin of one. But when it comes down to it. Pick one. I don't care

Re: [Jchat] How close is J to APL?

What book, specifically? What year was it first published? Thanks, — Raul On Friday, May 18, 2018, Don Guinn wrote: > ​If you look at the notation for vectors and matrices i​n mathematics the > first element of a vector is written as V(1) and the upper left corner of a >

Re: [Jchat] How close is J to APL?

Agreed. On Fri, May 18, 2018 at 8:46 AM, Roger Hui wrote: > > The mistake in APL was to duck the issue by allowing both making > generalized indexing difficult. > > That is why I say "⎕io *delenda est*" and not "1-origin *delenda est*", > although I do have a

Re: [Jchat] How close is J to APL?

​If you look at the notation for vectors and matrices i​n mathematics the first element of a vector is written as V(1) and the upper left corner of a matrix is M(1,1). Having to use parens because I can't figure out how to put subscripts in e-mail. True, in summations of infinite series etc. the

Re: [Jchat] How close is J to APL?

> The mistake in APL was to duck the issue by allowing both making generalized indexing difficult. That is why I say "⎕io *delenda est*" and not "1-origin *delenda est*", although I do have a preference. ⎕io *delenda est*! On Fri, May 18, 2018 at 7:40 AM, Don Guinn

Re: [Jchat] How close is J to APL?

The first one I looked at was "Handbook of Mathematical Functions" published in August, 1966. Also looked in several texts from college. I couldn't stand returning them to the bookstore for almost nothing. Then looked up vectors and matrices online. Whenever the index was not significant in the

Re: [Jchat] How close is J to APL?

Having programmed on 4K 1401s I became very aware of never wasting storage. So when forced to program in VB I could not decide to allocate arrays one element short or not. Really hated wasting the storage. But what would happen if VB started index range checking? On Fri, May 18, 2018 at 10:54 AM,