Re: plotting integrals

*To*: mathgroup at smc.vnet.net*Subject*: [mg131692] Re: plotting integrals*From*: Bill Rowe <readnews at sbcglobal.net>*Date*: Sat, 21 Sep 2013 04:37:30 -0400 (EDT)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*Delivered-to*: l-mathgroup@wolfram.com*Delivered-to*: mathgroup-outx@smc.vnet.net*Delivered-to*: mathgroup-newsendx@smc.vnet.net

On 9/20/13 at 7:07 AM, btta2010 at gmail.the com (Herman) wrote: >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}] Out of the box, Mathematica really does not work well with subscripted variables. So, try using the same functions with a standard name, not a subscripted name. If you really, really want to use subscripted variables, load the Notation package and read through the tutorial for this package. In my opinion, the effort effort involved to get Mathematica to properly use subscripted variables via the Notation package is not justified by the result.