## #math - Fri 18 May 2007 between 05:50 and 06:04

### NY Lost Funds

 webito %18446744073709551615+1I'm checking how many numbers can mbot accept% 18446744073709551615+1 mbot webito: 18446744073709551616 zaphyBeeble ye! mbot is back! TRWBW webito: well maybe take it to /msg webito ok newbie22 i have a question i know how to solve kronecker product of two matrices A kron B but what if i want the kron of three matrices A kron B kron C does that make sense? can i take the kronecker of a and b then take the kroneker product of that? TRWBW newbie22: yeah, it's associative newbie22 TRWBW ah great thanks ktne helloanyone here familiar with Mathematica? |Steve| No, not a single person out of 243 in a math channel has ever used Mathematica.Ever. ktne ohok then TRWBW ktne: some people are, but most won't talk about it in #math, it's not appropriate. ktne well where can i ask a question? ::) |Steve| It's not like we have a bot in channel that uses mathematica.@bot mbot :) TRWBW ktne: is your issue programming or actual mathematics, proofs, truth, etc.? ktne i have a 2d probability distribution map (the sum of all map cells is 1.0), i need to get a random point within the map TRWBW ktne: okay, pick a number 0..1 uniformly, then go cell by cell until the sum exceeds your random number. that's the one you want. ktne hmm, isn't that slow?isn't there some builtin function? TRWBW ktne: that's just not #math, but that's my opinion ktne ok, is there a place where i can ask this? TRWBW apparently not many people want to spend their time answering programming questions. can't blame them, neither do i. here's a hint, binary search. zaphyBeeble should have a channel called #logic :) |Steve| There is ##logic. zaphyBeeble oh how come it didnt show up in my list |Steve| ski is one of the ops. zaphyBeeble cool! thanks steve! |Steve| As is xerox.TRWBW: As I recall, you said you had little to no interest in point lattices, is that correct?(My memory has been known to be faulty.) TRWBW |Steve|: i ate lunch in a basic seminar once, it covered minkowski theorem, that's all i remember |Steve| Ah. lambda_1(L) <= sqrt(n)*det(L)^(1/n).