Coefficients in expressions
- To: mathgroup at smc.vnet.net
- Subject: [mg16742] Coefficients in expressions
- From: Virgil Stokes <virgil.stokes at neuro.ki.se>
- Date: Wed, 24 Mar 1999 02:23:53 -0500
- Sender: owner-wri-mathgroup at wolfram.com
I have generated several expressions (equations) in the form of:
c1*x1 + c2*x1' + c3*x2 + c4*y1+...+a1*x1'+ a2*y1 + a5*x1 +... == f1*z1 +...
where, the equations can be over 50 lines in length.
I would like to have a procedure (say Coeffs[.]) that would
allow me to specify as input the "names" in the equations. The
output would be all the coefficients for that list of names.
For example, for the above,
Coeffs[%,x1,x1',y1]
would output,
x1: (c1+a5)
x1': (c2+a1)
y1: (c4+a2)
-- V. Stokes