davidmaamoaix

#LinearRegTechX

def cost(x,y,k,b):
    return sum([(y[i]-x[i]*k+b)**2 for i in range(0,len(x))])/len(x)

def derivX(x,y,k,b):
    return sum([2*(y[i]-(k*x[i]+b))*-x[i] for i in range(0,len(x))])/len(x)

def derivB(x,y,k,b):
    return -sum([2*(y[i]-(k*x[i]+b)) for i in range(0,len(x))])/len(x)

davidmaamoaix

#use <conio>
#use <string>

/*
    Walmart version of a regex matcher. Only supports the following regex:
        - character class (e.g. '[a-zA-Z0-9_]', '[^a-z]', '[531-]')
        - choice '|'
        - match any '.'
        - match one or more '+'
        - match any times '*'