why i have different result when i run the newpr on different computer ?

i have create network as following

rand('seed',8); net = newpr(p,t,20); net.divideParam.trainRatio = .4; net.divideParam.testRatio = .4; net = train(net,p,t);

and i have a good result but when i run the code on another computer i have different result ?? why

i also try to take the initial weights and biases using

net.IW(1,1) net.LW(2,1) net.b{1} net.b{2} but the result also not the same "very BAD"

how i can test the result on another computer ?? and should the result be the same??

thanks a lot i need the answer very quickly cause i have no time cause i am a master student.

thanks a lot