Re: Stupid simple question about counting derivatives
- To: mathgroup at smc.vnet.net
- Subject: [mg33472] Re: [mg33437] Stupid simple question about counting derivatives
- From: Matthias.Bode at oppenheim.de
- Date: Fri, 22 Mar 2002 04:06:56 -0500 (EST)
- Sender: owner-wri-mathgroup at wolfram.com
Hello Jacek, Clear[a,x] D[a*x, x] yields a. Using * for multiplication is always highly advisible. Best regards, Matthias Bode Sal. Oppenheim jr. & Cie. KGaA Koenigsberger Strasse 29 D-60487 Frankfurt am Main GERMANY Tel.: +49(0)69 71 34 53 80 Mobile: +49(0)172 6 74 95 77 Fax: +49(0)69 71 34 95 380 E-mail: matthias.bode at oppenheim.de Internet: http://www.oppenheim.de -----Ursprüngliche Nachricht----- Von: Jack [mailto:kielczew at poczta.onet.pl] Gesendet: Donnerstag, 21. März 2002 15:27 An: mathgroup at smc.vnet.net Betreff: [mg33437] Stupid simple question about counting derivatives How do I get Mathematica 2.2 to count the derivatives of the simplest parametric functions, i.e. (ax)', where a is the parameter and x is the variable. I want to get: a (Hey, I said it was stupid). D[ax,x] gets me 0, Dt[ax,x] gets me Dt[ax,x] and I haven't figured out how to use Constants and NonConstants. I'd be grateful for any help as this simple problem is driving me crazy. -- Jacek Kieczewski kielczew at poczta.onet.pl