How can I use a random seed continually ?

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Hi I have a question about random seed. I want to use a two-random seed continually.

For example, when i=1, I use seed 1's first number in m-file and seed 2's first number in function. and next i=2, I want use seed 1's second number in m-file and seed 2's second number in function.

but below code is when i=1, I use seed 1's first number in m-file and seed 2's first number in function. and next i=2, I will use seed 2's second number in m-file and seed 2's third number in function.

This is pseudo code for understanding

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 rng(1)
for i=1:100
 A(i,1)=rand('unid',1)
    B=(i,1)= function( A(i,1) )
      % function y=function(x)
      % rng(2)
      % a=rand('unid',1) 
      % y=a + x
end