@acer 

thank you very much

@acer 

thank you soo mach

@Christian Wolinski 

thanks for answer . 
yes my system have 7 cores.

i write any numbers. this shows 4 

see this pic

@Carl Love 

thank you

@Carl Love 

wow that interesting thank you 

@Kitonum 

hi.

yes thats right but this code show only one plot . i want to show step by step (and show previous too)

@Rouben Rostamian  

thaaank you sooo much

@Rouben Rostamian  

thaaaaank you 

@Rouben Rostamian  

hi thank you but this i want to take differential from N matrix this approach just show the diff

see this pic

be assume N1,N2, N3 , ... is equal to

@tomleslie 

wwwwow  thaaaaaaaanks 

@ThU thaaaaaaaaaaaaank youuuuuuuu

@Kitonum 

hi thanks
i want to write this with for loops 

@Rouben Rostamian  

thaaaaank you very mach

@Kitonum 

thank you soooooo mach