I'd reply to your questions that yes Sebastian Villemot and Elliot Saba are working on the Debian packaging (last weekend there was a big commit that reorganized the files to facilitate this) and Jeff has announced comprehensions on distributed arrays, although I haven't tried using it yet.
However, the list administrator has told me not to discuss Julia on this list so I won't :-) On Mon, Nov 19, 2012 at 10:54 AM, Dirk Eddelbuettel <[email protected]> wrote: > > On 19 November 2012 at 10:47, Douglas Bates wrote: > | Sigh. Speaking as one of the "Julia guys" I should point out two things > (not > | that they will change Dirk's "cold, dead hands" attitude towards Julia > :-) > > No, just "lazy apt-get-able awaiting" hands. > > | 1. Comprehensions provide what I feel is a clean syntax for sugar-like > | operations in Julia > | > | 2. A problem with vectorization is the issue of multiple loops, hence the > | number of attempts at implementing delayed evaluation in compiled code > (Eigen) > | and in add-on's to R. > | > | A translation of Hadley's vacc3 into Julia could be > | > | function vacc3a(age::Float64, female::Bool, ily::Float64){ > | p = 0.25 + 0.3 * 1 / (1 - exp(0.04 * age)) + 0.1 * ily > | p *= female ? 1.25 : 0.75 > | min(max(0., p), 1.) > | } > | > | out = [vacc3a(age[i], female[i], ily[i]) for i in 1:length(age)] > | > | The comprehension collapses the > | 1. Determine the length of the output vector > | 2. Allocate the result > | 3. Loop over indices populating the result > | 4. Return the result > | > | to a single syntactic element that, in my opinion, is quite readable. > > Does that already give you parallel processing? That is the one element > missing here and I was thinking that in order completely push Hadley over > the > C++ cliff I should introduce him to OpenMP :) > > The next real trick will be to get these things done transparently on all > cores. > > Dirk > > -- > Dirk Eddelbuettel | [email protected] | http://dirk.eddelbuettel.com >
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