Step by step decay()

If you need to calculate decaying function but you need to do it step by step then use the function below.

import numpy as np

#one step of the decay
def decay(val, rate): return val * np.exp(-rate)

rate = 0.5
val = 10

for i in range(10) :
  print(val)
  val = decay(val, rate)

Output:

10
6.065306597126334
3.678794411714423
2.231301601484298
1.3533528323661268
0.8208499862389879
0.4978706836786394
0.30197383422318497
0.1831563888873418
0.11108996538242305

more decay Functions :

def fade(val,lam=0.05): return np.exp(-val * lam)
#exp decay: given max value and rate
def decay_max(x, maxx, rate) : return maxx * (( 1 - rate ) ** x)
#exp decay : given min&max value and how many steps to go from min -> max
def mm_decay(x, minn, maxx, steps) :
	rate =  (maxx ** float(1/float(steps)) ) - 1.0
	val = decay_max(x,maxx,rate)
	if val < minn : return 1
	return val

Tags: decaystep