Re: How to plot derivative directly?
- To: mathgroup at smc.vnet.net
- Subject: [mg118099] Re: How to plot derivative directly?
- From: Anthony Hodsdon <ajhodsd at hotmail.com>
- Date: Tue, 12 Apr 2011 05:58:07 -0400 (EDT)
Plot[Evaluate[D[x^3 - 6 (x + 1)^2 + x - 7, x]], {x, -3, 8}]
--Anthony
-----Original Message-----
From: =C5 er=C3=BDch Jakub [mailto:Serych at panska.cz]
Sent: Monday, April 11, 2011 4:06 AM
To: mathgroup at smc.vnet.net
Subject: [mg118099] [mg118061] How to plot derivative directly?
Dear mathgroup,
it seems to me, that response to my question shall be very simple, but I cannot find it. :-(
I want to plot the derivative of the function. I would like to do it directly, something like:
Plot[D[x^3 - 6 (x + 1)^2 + x - 7, x],{x,-3,8}]
It returns: General::ivar: "-2.99978 is not a valid variable."
I can understand that it is because local variable x from Plot command interferes with the x variable from the D[].
Yes I can bypass the problem by:
deriv = D[x^3 - 6 (x + 1)^2 + x - 7, x]
Plot[deriv, {x, -3, 8}]
which is fully functional, but as far as I know Mathematica, there must be some simple solution how to do it directly inside the Plot[].
Thanks in advance for kick-off
Jakub