Fun question. I checked that too before sending the message. typemax(BigInt) isn't implemented
BigInt(typemax(Int64)) ^ 1000000 gives me a big number According to wolfram alpha (since I didn't know how to easily count the digits in Julia) .... The number has 1,8964,890 decimal digits BigInt wraps the GNU GMP library which apparently can be used to calculate a billion digits of pi https://gmplib.org/pi-with-gmp.html J doesn't apparently like numbers that big or I need to do something different to enable them 9223372036854775807^1000000 _ Looks like it stops around to the 16th power 9223372036854775807^16 2.74306e303 9223372036854775807^17 _ On Fri, Jan 24, 2014 at 1:18 PM, Dan Bron <[email protected]> wrote: > > 4*{:$3!:3]2 > 64 > > -Dan > > PS: What is typemax(BigInt) ? > > > ----- Original Message --------------- > > Subject: Re: [Jchat] [Jprogramming] more fork examples > From: Joe Bogner <[email protected]> > Date: Fri, 24 Jan 2014 13:09:51 -0500 > To: [email protected] > > julia> typemax(Int64) > 9223372036854775807 > > > > On Fri, Jan 24, 2014 at 1:08 PM, Joe Bogner <[email protected]> wrote: >> Neat... >> >> julia> 9223372036854775807 >> 9223372036854775807 >> >> julia> 9223372036854775807+1 >> -9223372036854775808 >> >> Need to use BigInt >> >> julia> BigInt(9223372036854775807)+1 >> 9223372036854775808 >> >> >> >> On Fri, Jan 24, 2014 at 12:56 PM, Dan Bron <[email protected]> wrote: >>> What's the highest value a signed integer can represent on your platform >>> (ie. 32 bit or 64 bit)? >>> >>> |>:{.i:_j1 >>> 9223372036854775807 >>> >>> 1 + |>:{.i:_j1 NB. Now floating-point >>> 9.22337e18 >>> >>> -Dan >>> >>> >>> ----- Original Message --------------- >>> >>> Subject: Re: [Jchat] [Jprogramming] more fork examples >>> From: Devon McCormick <[email protected]> >>> Date: Fri, 24 Jan 2014 12:31:53 -0500 >>> To: Chat forum <[email protected]> >>> >>> 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 >>> ---------------------------------------------------------------------- >>> For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
