
Re: plotting integrals
Posted:
Sep 21, 2013 4:19 AM


Perhaps trying to evaluate the integrand at one particular value will give a clue to what's wrong:
Subscript[\[Eta], B][0, 1, 3] NIntegrate::itraw : Raw object 0 cannot be used as an iterator Sqrt[1  NIntegrate[\[Psi]1[0, 1, 3]*\[Psi][0, 1*Sqrt[2*3*(3  1)]], {0, Pi/2, Pi/2}]]
You're trying to integrate a function of "variable" that's actually the constant 0 !
On Sep 20, 2013, at 7:07 AM, Herman <btta2010@gmail.com> wrote:
> Dear All, > > I would like to plot the function Subscript[\[Eta], B] but I got errors. > Could someone please help me with these errors? > > > \[Psi][x_, \[Omega]_] := (\[Omega]/\[Pi])^(1/4) > Exp[1/2 \[Omega] x^2] > > \[Psi]1[x_, a_, n_] := Sqrt[(2 n)!!/((2 n  1)!! \[Pi])] Cos [a*x]^n > > Subscript[F, TPT][x_, a_, n_] := > NIntegrate[\[Psi]1[x, a, n]*\[Psi][x, > a*Sqrt[2 n (n  1)]], {x, \[Pi]/2, \[Pi]/2}] > > Subscript[\[Eta], B][x_, a_, > n_] := Sqrt[(1  Subscript[F, TPT][x, a, n])] > > Plot[Subscript[\[Eta], B][x, 1, 3], {x, \[Pi]/2, \[Pi]/2}]
 Murray Eisenberg murray@math.umass.edu Mathematics & Statistics Dept. Lederle Graduate Research Tower University of Massachusetts 710 North Pleasant Street Amherst, MA 010039305

