Numerical calculation of derivative functions
- To: mathgroup at smc.vnet.net
- Subject: [mg17000] Numerical calculation of derivative functions
- From: L B Venema <lvenema at kvi.nl>
- Date: Sat, 10 Apr 1999 02:13:35 -0400
- Organization: Rijksuniversiteit Groningen
- Sender: owner-wri-mathgroup at wolfram.com
Probably this question is very trivial, but can someone inform me how I can force mathematica to calculate the numerical result from a previously evaluated formal solution, like f[x_]:=D[sin[x],x]; f[x]/.x->1 Also N[%] is not more specific than D[sin[1]]. I think the problem is related that I cannot force Mathematica to first evaluate the differential and subsequently substitutes the x by 1 in the cos. (My real problem involves unknown dimensions of arrays in a non-linear optimization problem). Thank you for your help, Lars Venema