Parameters aren't seen inside function

[Sancho_Pansa]

Hello,

The question is related to the use of the Lcapy library (circuit analysis).
The 1st version of the Vin declaration (which is commented out) does not work: freq and pi are not visible in the Circuit function.

from lcapy import Circuit
import numpy as np
from matplotlib.pyplot import subplots, savefig
from math import pi
freq = 130e6
cct = Circuit('''
##... Vin 1 0 {1*sin(2*pi*freq*t)}
... Vin 1 0 {sin(130e6*2*3.14159*t)}
... Rin 1 2 50
... Cs  2 4 1e-12
... L   2 3 0.32e-6
... Rs  3 4 5
... Cl  4 0 3e-12''')

t = np.linspace(0, 2e-7, 1000)
vcl = cct.Cl.v.evaluate(t)

fig, ax = subplots(1)
ax.plot(t, vcl, linewidth=2)
ax.set_xlabel('Time (s)')
ax.set_ylabel('Output voltage (V)')
ax.grid(True)

savefig('antenna_output.png')

How to make them visible inside function?

Thanks.

Sancho.