Dear Peter Below is the code I tried to check if itertools.product() was faster than normal nested loops...
they arent! arent they supposed to be...or am i making a mistake? any idea? *############################################################* *# -*- coding: utf-8 -*-* *import numpy as np* *import time* *from itertools import product,repeat* *def main():* * # N - size of grid* * # nvel - number of velocities* * # times - number of times to run the functions* * N=256* * times=3* * f=np.random.rand(N,N,N)* * # using loops* * print "normal nested loop"* * python_dot_loop1(f,times,N)* * print "nested loop using itertools.product()"* * python_dot_loop2(f,times,N)* *def python_dot_loop1(f,times,N):* * for t in range(times):* * t1=time.time()* * for i in range(N):* * for j in range(N):* * for k in range(N):* * f[i,j,k] = 0.0* * print "python dot loop " + str(time.time()-t1)* *def python_dot_loop2(f,times,N):* * rangeN=range(N)* * for t in range(times):* * t1=time.time()* * for i,j,k in product(rangeN,repeat=3):* * f[i,j,k]=0.0* * print "python dot loop " + str(time.time()-t1)* *if __name__=='__main__':* * main()* *############################################################*
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