Re: Inplicit differentiation
- To: mathgroup at smc.vnet.net
- Subject: [mg63555] Re: [mg63533] Inplicit differentiation
- From: Pratik Desai <pdesai1 at umbc.edu>
- Date: Thu, 5 Jan 2006 03:12:23 -0500 (EST)
- References: <200601040817.DAA26059@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Fernando Rodríguez wrote: >Hi, > >How can I ask Mathematica to differentiate a function if y is not easily >isolated? For instance: > >x^2 y + (y + x)^3 = 0 > >If I call D[x^2 y + (y + x)^3 == 0, x] it won't return the correct answer, >as it will consider y a constant. > >Thanks! > > > > Per haps using NotConstants, this assumes that y depends on x, which I hope is your assumption here Solve[D[expr1[x, y][[1]], x, NonConstants -> y] == 0, D[y, x, NonConstants -> {y}]] Best regards, Pratik
- References:
- Inplicit differentiation
- From: Fernando Rodríguez <frr@easyjob.net>
- Inplicit differentiation