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from hep.aida import IFunction
import AIDATutorial
import math

class MyFunc(IFunction):
    def __init__(self, track):
        self.title = "My Own Function"
        return

    def providesGradient(self):
        return false

# This Function returns the value f(x)
# x can be multi-dimensional
    def value(self, x):
        y = x[0] + math.exp(x[1]) + x[0]*x[1]
        externalValue = AIDATutorial.someExternalFunction(y, x)
        return externalValue-y

# This tells AIDA the dimension of the function
    def dimension(self):
        return 2

    def annotation(self):
        ann = IAnnotation()
        ann.addItem('Title', self.title)
        return ann