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polar coordinates

• To: mathgroup at smc.vnet.net
• Subject: [mg13397] polar coordinates
• From: "Toshiyuki Meshii" <tm60 at cornell.edu>
• Date: Thu, 23 Jul 1998 03:32:40 -0400
• Sender: owner-wri-mathgroup at wolfram.com

Dear Sirs,
Let me know the way to work with patial differentiation on polar
coordinates.
For examples, when
x = r Cos[q] and y = r Sin[q]
how can you obtain
du[x,y]/dx = Cos[q] * (du[x,y]/dr) - Sin[q] / r * (du[x,y]/dq) by
Mathematica?
Thank you in advance.

Toshiyuki