Re: Numerical calculation of derivative functions
- To: mathgroup at smc.vnet.net
- Subject: [mg17020] Re: [mg17000] Numerical calculation of derivative functions
- From: BobHanlon at aol.com
- Date: Wed, 14 Apr 1999 02:11:44 -0400
- Sender: owner-wri-mathgroup at wolfram.com
In a message dated 4/10/99 8:06:42 AM, lvenema at kvi.nl writes: >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). > Lars, Mathematica is case-sensitive. You need to use Sin vice sin. Bob Hanlon