« first day (2321 days earlier)      last day (2164 days later) » 

10:04 AM
@JoeStavitsky I don't understand, why would it be?
 
 
5 hours later…
3:47 PM
Hi, does anybody know how to integrate functions over non standard regions? My example would be $f(x,y,z)=xyz$ over $0 \le x \le y \le z \le 1$.
 
4:01 PM
@philmcole AFAIK you can simply define your Region and use this in Integrate
 
Unfortunately Region has no thorough documentation... How would you define the region? @halirutan
 
In[109]:= Integrate[ x y z, {x, y, z} \[Element]  ImplicitRegion[0 <= x <= y <= z <= 1, {x, y, z}]]

Out[109]= 1/48
That's how I would start.
 
4:14 PM
@all: I hope everyone knows that there is an easy way to turn on LaTeX for our chat. Go to your bookmarks manager and create a new bookmark called "Start LaTeX in Chat". As URL, you don't use a normal URL but you paste this code in it. Now, it is as simple as pressing this bookmark and bam, you have LaTeX turned on
5
 
4:24 PM
Oh, ImplicitRegion. Thanks, I only looked at the Region documentation.
 
4:37 PM
Ah, now it works. Great!
 
@halirutan. Thanks for posting about MathJax. I didn't know about your "easy way". I have now made such a bookmark and it seems to work. For example, $\sqrt{x^2+y^2}\,\sin(\frac{x}{y})$
 
I'm curious didn't you guys know about the bookmark used in the Mathematics chat?
For me it works in this chat too
 
@philmcole. Didn't know about it because I have never used that chat room.
 
4:52 PM
Wow, then it's about time you get the bookmark too! Raw LaTeX is not nice to read.
 
5:21 PM
@philmcole That's where I stole it :) Long time ago I got sick of reading latex code and I knew if someone has already a solution for this, it is the math guys.
For reference
117
A: Should chat have TeX support?

robjohnThere are four bookmarks which are located on this installation page: start ChatJax installs MathJax and starts a loop that renders $\LaTeX$ as needed. This is intended for use in chat, where the contents of the page are not static. Reloading the page will stop the loop, so the bookmark needs t...

@philmcole I have this for a long time and when I saw your message, I thought it might be a good idea to share it.
 
5:34 PM
I don't know what the mathematics chat did before robjohn built the bookmark but reading math in Raw Latex must have been a harsh environment. I always assumed you guys know about this :P
 
@philmcole It's really rare that someone posts LaTeX here. Mostly, we simply use Mathematica code that everyone can read.
 
 
1 hour later…
6:44 PM
@philmcole You can also use Boole to multiply in the region as a 0/1 factor: Integrate[(x y z) Boole[0 <= x <= y <= z <= 1], {x, -Infinity, Infinity}, {y, -Infinity, Infinity}, {z, -Infinity, Infinity}]. Might be useful to know for constructing some integrals.
 
 
2 hours later…
8:25 PM
@eyorble Thanks, I'll keep this in mind!
 

« first day (2321 days earlier)      last day (2164 days later) »