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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


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