# [Maxima] I can't get this to work.

Richard Hennessy rvh2007 at comcast.net
Sat Nov 8 18:20:50 CST 2008

```Here is my relevant code

(start:1,stop:50)\$

f(xval,energy,qn):=
block
([fpprec:fpp,a,p,i,acc,hbar,m,mu,x,y,yt,e,maxterms:100000],x:bfloat(xval),e:bfloat(energy),
a[-5]:0,a[-4]:0,a[-3]:0,a[-2]:0,a[-1]:0,a[0]:if mod(qn, 2)=1 then 1b0 else 0b0,a[1]:if mod(qn,2)=0 then 1b0 else
0b0,
hbar:1,mu:1/10000,m:1,
if mod(qn,2)=1 then (y:bfloat(a[0]),acc:1b0) else (y:bfloat(a[1]*x), acc:x),
for i: 2 + if mod(qn,2)=1 then 0 else 1 thru maxterms step 2 do (
a[i]:(mu * a[i-6] - a[i-2] * e)/(i * (i - 1) * hbar^2/(2*m)),
acc:acc*x*x,
yt:acc*a[i],
y:y+yt,
if abs(yt) < 1b-50 then (b:i,i:maxterms + 1000) else b:i
),
y
)\$

%Psi(x,t):=sum(C[qn]*(1/sqrt(A[qn])*f(x,Allowed_Energy[qn][1],qn))*exp(((-Allowed_Energy[qn][1])*%i*t)),qn,start,stop);

apply
(
draw,
append
(
[
pic_width=550,
pic_height=400,
delay = 50,
file_name = "c:/Harmonic Stationary Fast",
terminal = 'animated_gif
],
makelist(gr2d(title="Gaussian in a x^4 Potential", yrange=[0,1], color=blue,
explicit(realpart(conjugate('%Psi(x, t/90*%pi))*'%Psi(x,t/90*%pi)),x,-5,5)), t, 0, 1)
)
);

C[i], Allowed_Energy[i][1] and A[i] are big floats, just real numbers not functions.

I get "Storage for stream is exausted." in the draw command.  I think the reason is because Maxima is trying to evaluate
the function before x and t have numerical values assigned to them.  I have only two frames and I get the error.  I want
to do at least 90 frames.  I am not sure what that number will work out to yet and I don't care how long it takes to
run.

Help!

Rich

```