def irr(file="irr.txt"):
	data = [i.strip() for i in open(file).readlines()]
	data = [(data.index(i)+1,float(i))for i in data]
	ff =open("irroutput.txt" , "w")
	for i in data:
		ir = caldiff(10000,i[1],i[0],.05)
                o= ((1+ir)**12 -1)
		print i[0],o
		ff.write(str(o)+"\n")
	ff.close()
		
		


def caldiff(X , val , n , r=.1):
	while(1):
		s = sum([X*(1+r)** i for i in range(1,n+1)])
		d = s-val
		pr = d/val
      		if d<0:
			irr = r+.00003
		else:
			irr=r-.00003
		
	        s1 =  sum([X/(1+irr)** i for i in range(1,n+1)])
		
		new_irr = irr + (s1*(r-irr)/(s1-s))
		
		if pr>.001 or pr<-.01:
         		r=irr
		else:
			#print val,s,d,pr,irr , new_irr	
			return irr

def sensex():
	data = [i.strip() for i in open("newsensex.txt").readlines()]
	ind=0
	new = []
	b = 21
	ff= open("sensexdata.txt","w")
	for ind in range(len(data)/b):
		index = 1+ b*ind
		new+=[data[index]]
	for i in new:
		ff.write(str(i)+ "\n")
	ff.close()
		

def eq(n=1,f="equitytest.txt"):
	data = [float(i.strip()) for i in open(f).readlines()]
	d = []
	
	for i in range(len(data)-n):
		u = i + n 
		l = i
		d+=[100*(data[u] - data[l])/data[l]]
	return sum(d)/len(d)


def fi(n):
	f= open("result.txt","w")
	for i in n:
		f.write(str(i)+ "\n")
	f.close()