Re: How to solve the integrate problem
- To: mathgroup at smc.vnet.net
- Subject: [mg128139] Re: How to solve the integrate problem
- From: Alexei Boulbitch <Alexei.Boulbitch at iee.lu>
- Date: Tue, 18 Sep 2012 03:42:39 -0400 (EDT)
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x>Q ,Q(P-W)-M(x-Q), x belongs(Q,infinite)
x<=Q,P*x-W*Q+S(Q-x), x belongs(0,Q)
Q,P,W,M,S are unknown constant number.
I want to *dx*
THANK U
It is not very clear, what do you mean by "I want to *dx*". If you need
to integrate your expression, try this:
(* This is your function *)
f[x_] := If[x > Q, Q (P - W) - M (x - Q), P*x - W*Q + S (Q - x)]
(* Here it is drawn with arbitrarily selected values of its parameters to see, how it looks like *)
Plot[f[x] /. {Q -> 1, P -> 2, W -> 1, M -> 1.5, S -> 3}, {x, 0, 3}]
(* Here the integral is calculated. It is a piecewise function and its value depends upon the value of Q *)
(* as well as upon the value xmax *)
Manipulate[
Integrate[f[x], {x, 0, xmax}, Assumptions -> Q >= 0], {xmax, 0, 2}]
If you want to calculate the derivative, consider this:
D[f[x], x]
If[x > Q, -M, P - S]
Have fun, Alexei
Alexei BOULBITCH, Dr., habil.
IEE S.A.
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