Re: Cross product with Mathematica
- To: mathgroup at smc.vnet.net
- Subject: [mg15571] Re: Cross product with Mathematica
- From: adam.smith at hillsdale.edu
- Date: Tue, 26 Jan 1999 13:44:48 -0500 (EST)
- Organization: Deja News - The Leader in Internet Discussion
- References: <7813q6$p0m@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
In article <7813q6$p0m at smc.vnet.net>, smoisan at total.net wrote: > Hi, > > I wanted to do some calculations involving cross product over the > weekend using Mathematica. That's when I discovered there's no way of > doing any cross product using this software, at least, not in the > version we have at the univerity which is 2.2 for Solaris. Is this > possible in another version? > Is there an add-on available somewhere so I can do cross product? Any > help would be appreciated. > > Thanks in advance. > > Sylvain Moisan > mailto:smoisan at total.net > The Metal Files <http://tropin.phy.ulaval.ca/smoisan/muzac.html> > > -----------== Posted via Deja News, The Discussion Network ==---------- > http://www.dejanews.com/ Search, Read, Discuss, or Start Your Own > > You need to load a package Calculus`VectorAnalysis` to do this: In[1]:= a = {a1,a2,a3} b = {b1,b2,b3} Out[1]= {a1,a2,a3} Out[2]= {b1,b2,b3} In[3]:= <<Calculus`VectorAnalysis` In[4]:= SetCoordinates[Cartesian[x,y,z]] Out[4]= Cartesian[x,y,z] In[5]:= CrossProduct[a,b] Out[5]= {-a3 b2+a2 b3,a3 b1-a1 b3,-a2 b1+a1 b2) Note in <<Calculus`VectorAnalysis`, the symbol surrounding the VectorAnalysis is not the apostrophe (the unshifted double quote), but is the character next to the 1 key on my keyboard (unshifted ~, I don't know the name) Also, Version 3 defines a function Cross[a,b] that does not require VectorAnalysis. Hope that helps Adam Smith -----------== Posted via Deja News, The Discussion Network ==---------- http://www.dejanews.com/ Search, Read, Discuss, or Start Your Own