generating random numbers only 2 numbers

i want to generating random numbers on matrix 1x30
how i get generating 2 random numbers (only 1 and 4 , not between) ???

 采纳的回答

a = randi([0 1], [1 30])*3 + 1
a = 1×30
1 1 4 4 4 4 4 1 1 4 1 4 4 4 1 4 4 4 1 1 1 4 1 4 4 1 4 4 4 4

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R2021a

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