MaplePrimes - answers and comments on Question, Symbolic Computations

Several errors

alec — Mon, 16 Nov 2009 05:53:36 Z

You have several errors here.

First, H is an equation and in the phi definition you have some expression plus that equation multiplied by something. What does that suppose to mean?

Second, you have defined phi and then is using it as phi(x). Either you should use it as phi and not phi(x), or define is as phi :=x-> something (or as a procedure).

Third, you can't integrate equations - say int(x=x^2,x) doesn't have much sense. You need expressions instead of equations.

Alec

maybe

PatrickT — Mon, 16 Nov 2009 21:24:15 Z

assuming you meant to type * instead of = in the formula for H:

H:= (cos(n*L)*cosh(n*L))/(sin(n*L)-sinh(n*L)):
phi:=x->sin(n*x)-sinh(n*x)+H*(cos(n*x)-cosh(n*x)): 
int(phi(x), x=0..L);
  1/2 (4 exp(n L) sin(n L) - 4 exp(n L) sinh(n L)

         - 2 cos(n L) sin(n L) exp(n L)

         - cos(n L) cosh(n L) exp(2 n L)

         + 2 cos(n L) sinh(n L) exp(n L) + cos(n L) cosh(n L)

         - exp(2 n L) sin(n L) + exp(2 n L) sinh(n L) - sin(n L)

         + sinh(n L) + 2 cos(n L) cosh(n L) sin(n L) exp(n L))

        exp(-n L)/((sin(n L) - sinh(n L)) n)

That works. Thanks for the

TD03 — Tue, 17 Nov 2009 09:34:48 Z

That works. Thanks for the help