>>> import math

>>> from mat import f_mat

>>> x=round(f_mat(10, 20), 1)
>>> x
0.8
>>> x=round(f_mat(0.5, 0.8), 1)
>>> x
1.7
>>> x=round(f_mat(0, 0), 1)
>>> x
2.2
>>> x=round(f_mat(math.pi/2, 0), 1)
>>> x
1.2