Hi

I am trying to solve for numerical values but get symbolic answers. What am I 
doing wrong?

My code:

var('L,E,g')
w=2*pi.n()
u=1/12
c_0 = 0.1
j = 20
de = 0.25
al = list()
AR=range (2,20,1)
AR.reverse()
print AR
z=(g+u)^2 + j^2*w^2 
-c_0*exp(-g*L)*(cos(j*w*L)*(g+u)-j*w*sin(j*w*L))/c_0*exp(-g*L)*(cos(j*w*L)*    
(g+u)-j*w*sin(j*w*L))
for k in AR:
    P=c_0*exp(-g*L)*(cos(k*w*L)*(g+u)-k*w*sin(k*w*L))/((g+u)^2+ k^2*w^2)
    Z = 1/P - 1 - (e^2/4)/z
    z = Z
for E in range (0.00,2.00,de): 
    for L in range (0,5,1):  
        b=((g+u)-c_0*exp^(-g*L))/c_0*exp^(-g*L)
        solve([b==E^2/2*z],g)
        al.append(g)

The result:

                        
               
               [19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2]
[g == 1/60]
[g == (6 - 5*exp^g)/(60*exp^g)]
[g == (6 - 5*exp^(2*g))/(60*exp^(2*g))]
[g == (6 - 5*exp^(3*g))/(60*exp^(3*g))]
.....


thanks,
Josephine


      
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