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MathGroup Archive 1998

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Dimensions and Variables

  • To: mathgroup at smc.vnet.net
  • Subject: [mg13687] Dimensions and Variables
  • From: Naum Phleger <naum at condor.physics.ucsb.edu>
  • Date: Sat, 15 Aug 1998 04:39:18 -0400
  • Sender: owner-wri-mathgroup at wolfram.com

I have four questions.

1)Why does Dimensions comand return 2 for x*Cos[y]?  I need to check
dimensions of quantities and this makes it dificult to do.

2)I have a complicated web of function definitions which I neglected to
put explisit variabe dependencies.  Can I add dependence on the lowest
leval variables to the highest leval functions easily or do I have to
do it each step of the way.  Any reference to a carefull and clear
discusion of variable dependent functions would also help.

3)Does Mathematica Know anything about map projections.  I have a vector
feild of the sky and I want to plot it in a certin projection.  All I
have been able to do so far is plot vectors on square euclidian space.

4)Sometimes when I plot these vector feilds I get an odd result.  I get
no arow heads on some vectors, and multiple heads on others.  I haven't
been able to figure out why it will do this or do it corectly.  I seems
random to me.

Any help with any of these would be appreciated, Thank You
	
	-NAUM


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