arrays - Pairs of random numbers Matlab -


i trying generate random numbers between 1 , 6 using matlab's randperm , calling randperm = 6.

each time gives me different array let's example:

x = randperm(6) x = [3 2 4 1 5 6]

i wondering if possible create pairs of random numbers such end x like: 

x = [3 4 1 2 5 6]

i need vector arranged such 1 , 2 next each other, 3 , 4 next each other , 5 , 6 next each other. i'm doing in psychtoolbox , order important.

is possible have "blocks" of random order? can't figure out how it.

thanks

i can see simple 3 step process desired output:

  1. produce 2*randperm(3)
  2. double values
  3. add randperm(2)-2 (randomly ordered pair of (-1,0)) each pair.

in code:

x = randperm(3) y = 2*x([1 1 2 2 3 3]) z = y + ([randperm(2),randperm(2),randperm(2)]-2)

with result

x = 3 1 2 y = 6 6 2 2 4 4 z = 6 5 2 1 3 4

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