Re: Stupid simple question about counting derivatives
- To: mathgroup at smc.vnet.net
- Subject: [mg33466] Re: [mg33437] Stupid simple question about counting derivatives
- From: Tomas Garza <tgarza01 at prodigy.net.mx>
- Date: Fri, 22 Mar 2002 04:06:44 -0500 (EST)
- References: <200203211427.JAA18170@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Are you sure you're leaving a space between the a and the x in a x? If you aren't, then ax is a symbol, an unknown symbol, and that is why you're getting those answers: In[1]:= D[ax, x] Out[1]= 0 In[2]:= D[a*x, x] Out[2]= a In[3]:= Dt[ax, x] Out[3]= Dt[ax, x] In[4]:= Dt[a*x, x] Out[4]= a + x*Dt[a, x] Tomas Garza Mexico City ----- Original Message ----- From: "Jack" <kielczew at poczta.onet.pl> To: mathgroup at smc.vnet.net Subject: [mg33466] [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 Kie³czewski > kielczew at poczta.onet.pl > > > > >
- References:
- Stupid simple question about counting derivatives
- From: Jack <kielczew@poczta.onet.pl>
- Stupid simple question about counting derivatives