def ackley(x, a=20, b=0.2, c=2 * ria.pi()):
#x = np.asarray_chkfinite(x) # ValueError if any NaN or Inf
#print (x)
n = len(x)
s1 = sum([v**2.0 for v in x])
s2 = sum([ria.cos(c * v) for v in x])
return -a * ria.exp(-b * (s1 / n)**(1.0 / 2.0)) - ria.exp(
s2 / n) + a + ria.exp(1)
def griewank(x, fr=4000):
#x = np.asarray_chkfinite(x)
n = len(x)
j = np.arange(1., n + 1)
s = sum([v**2 for v in x])
v = []
for i in range(len(x)):
v.append(x[i] / ria.sqrt(j[i])) #ria.sqrt
p = prod(([ria.cos(xi) for xi in v]))
return s / fr - p + 1
def rastrigin(x): # rast.m
x = np.asarray_chkfinite(x)
n = len(x)
return 10.0 * n + sum(
[v**2.0 - 10.0 * ria.cos(2.0 * ria.pi() * v) for v in x])