What's 2147483647+1 in Julia?
On Fri, Jan 24, 2014 at 10:07 AM, Joe Bogner <[email protected]> wrote: > My experience with python is that it's difficult to set up an scipy > environment on windows. There are packaged solutions, like Anaconda[1] > that simplify it greatly, but it's still a 340MB download. I've > installed all the packages manually before and dealt with the > dependencies. It probably took about an hour of trial and error. My > install folder is 800MB > > It works well once it's up and running. I haven't had it break, but > I'm also afraid to update anything. Fortunately, it's a relatively > complete environment for what I'm using it for. > > I would not want to try and push it out to a team. > > R just works and it's package manager has never let me down. It's easy > to update packages and the dependencies are resolved. It's generally > fast enough for what I'm doing. > > I've played with Julia on and off over the past year and it's looking > more and more like a useful platform. There wasn't a pre-built 64-bit > binary as-of 6 months ago. It was released about 4 months ago. I read > this article yesterday that re-invigorated my interest. > http://www.evanmiller.org/why-im-betting-on-julia.html As a language > geek, it's neat to see what's really happening under the hood. It's > array handling is fairly clean > (http://docs.julialang.org/en/latest/manual/arrays/) > > > julia> [1 2 3] + 1 > 1x3 Array{Int32,2}: > 2 3 4 > > julia> [1 2 3] + [2 3 4] > 1x3 Array{Int32,2}: > 3 5 7 > > This made me cringe... Probably a slightly nicer way to do it: > > julia> map(x->length(x) > 0 ? first(x) : -1, map((y) -> find((x) -> > x==y,[1,2,3] > ),[1,2,5,1])) > > 4-element Array{Int32,1}: > 1 > 2 > -1 > 1 > > Compared to > > (1 2 3) i. (1 2 5 1) > 0 1 3 0 > > Sidenote: (Julia arrays are 1-based and I substituted -1 instead of > length for not found): > > That being said, it does have coroutines and worker processes, > http://docs.julialang.org/en/latest/manual/parallel-computing/ > > [1] - http://continuum.io/downloads > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > -- Devon McCormick, CFA ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
