[Jprogramming] Arrayfire addon

maximize the time spent with the fastest tool available. And that means expressing your ML logic in array terms. J should be good at that. Mike Powell -- For information about J forums see http://www.jsoftware.com/forums.htm

Re: [Jprogramming] Different result of mean for row and column vectors

2 3 4 > 2 3 4 > $ +/ foo > 3 4 > > [0]: https://code.jsoftware.com/wiki/Vocabulary/slash > [1]: https://code.jsoftware.com/wiki/Vocabulary/AET#Item > > Cheers, > > Jan-Pieter > > Op wo 15 apr. 2020 om 20:54 schreef Mike Powell : > >> Thomas, >>

Re: [Jprogramming] Different result of mean for row and column vectors

Thomas, I J there is not really anything for a column vector. If an object, like your rvec, has a single dimension it’s a vector. If it has two dimensions, as does cvec, it’s a matrix. That’s different from most conventional mathematical notation. When you do the summation with +/ you lose a d

Re: [Jprogramming] Generating "music" in J (or otherwise)

> On Mar 30, 2020, at 07:04, Raul Miller wrote: > > Hmm... > > Currently only $854 for a paperback copy of Cybernetic Music from > Amazon ($34 for hardcover, though (and $14 for a paperback copy from > Albris -- plus $4.80 for tax and shipping...)). I think you meant $8.45 for the Amazon pap

Re: [Jprogramming] multiply two multidimensional matrices

Ken Iverson dealt with tensor contraction in his APL 79 paper "The Derivative Operator". He suggested an operator (a J adverb) which today can just be an APL function (a J verb). This took an array as its left argument and an even-numbered vector of indices as its right argument. It performed ze

Re: [Jprogramming] 901 and calculus primitives (D. et. al.)

Having had a chance to look at math/calculus, I’m pretty sure it’ll meet all of my needs. I’ll keep J807 for reference. Thanks, Mike > On Aug 27, 2019, at 08:56, Eric Iverson wrote: > > 901 and calculus primitives (D. et. al.): > > If you want D. , and it completely meets your requirements

Re: [Jprogramming] Calculus primitives are removed

_update/update.sh" > > then on restarting J, I had the updated version. > > Cheers, bob > >> On Aug 27, 2019, at 7:50 AM, Mike Powell wrote: >> >> Platform: Darwin 64 > > ---

Re: [Jprogramming] Calculus primitives are removed

64 (arm64-v8a) > Installer: unknown > InstallPath: /storage/emulated/0/Android/data/com.jsoftware.j.android/files > Contact: www.jsoftware.com > > > On Tue, Aug 27, 2019, 10:35 PM Mike Powell wrote: > >> I downloaded j901_mac64.zip from the link >> https://code.jsoftwa

Re: [Jprogramming] Calculus primitives are removed

#x27;t support the u. > primitive, which is new. > > Henry Rich > > On 8/27/2019 10:29 AM, Mike Powell wrote: >>> Try >>> >>> load'math/calculus' >>> +: deriv_jcalculus_ 1 >>> >> I have installed J901 beta and start J

Re: [Jprogramming] Calculus primitives are removed

> Try > > load'math/calculus' > +: deriv_jcalculus_ 1 > I have installed J901 beta and start J with jqt.app just fine. I’ve used the Package Manager to install math/calculus (three times): Updating server catalog... Done. Installing 1 package of size 6.4 KB Downloading math/calculus... I

Re: [Jprogramming] Calculus primitives are removed

”. (I’m certainly not arguing for any further expansion of the capability.) Is there some documentation that describes what’s available in the math/calculus addon? Cheers, Mike Powell > On Aug 26, 2019, at 16:04, Henry Rich wrote: > > J has supported symbolic differentiation and in

Re: [Jprogramming] Video for the Tail Monadic Verb

Robert, > I believe that an object with a shape of 0 does present as a blank line. Indeed. I just found it unhelpful in the video to say that something with a shape of zero is a blank line. Perhaps a little picky. As you suggest, better to say “… presents as …”. > For the background shapes, I c

Re: [Jprogramming] Video for the Tail Monadic Verb

Bob, Your work is just excellent. I’ll offer two comments: At 3:46 of the Tail video you say: “which gives us a shape of zero which is a blank line”. Not sure about that. I applaud your use of visual coding. Objects or parts of objects are outlined in various ways with various colour fills. I

Re: [Jprogramming] Converting numpy array to J?

Devon, If it’s just MNIST data you need, I was able to reformat files from http://yann.lecun.com/exdb/mnist/ quite satisfactorily. I used Dyalog APL and did actually write up the format as a pdf file. The function I used went like this: r←read file;⎕IO;tn;d

[Jprogramming] D. derivative

I'm having trouble understanding one of the examples in NuVoc dealing with the derivative conjunction. It comes up in the third of the common uses section. This sets out a verb that calculates 3 values from a list. The verb is f =: (<./ , (+/ % #) , >./)@, and the sample data x =: 2 4 $ 3 1 2