Function ptm_func

ipsae.py:111–112

(x,d0)

# Define the ptm and d0 functions
def ptm_func(x,d0):
    return 1.0/(1+(x/d0)**2.0)
ptm_func_vec=np.vectorize(ptm_func)  # vector version

# Define the d0 functions for numbers and arrays; minimum value = 1.0; from Yang and Skolnick, PROTEINS: Structure, Function, and Bioinformatics 57:702–710 (2004)