How do I create a random row matrix with some fixed positions?

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Abdullah Türk
Abdullah Türk 2019-4-21
评论： Abdullah Türk 2019-4-21
Hello everyone,
I want to create a row matrix with some fixed positions. For example,
>> randperm(20)
ans =
11 3 14 5 4 8 13 15 10 6 18 9 20 16 17 7 12 2 19 1
But I want to keep some positions in this array. For example, the first three positions of the array should always be 11 3 and 14, regardless of how much I use the randperm (20) command. How can I do this? It is possible?

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Andrei Bobrov
Andrei Bobrov 2019-4-21
编辑：Andrei Bobrov 2019-4-21
a = [ 11 3 14];
b = 1:20;
c = setdiff(b,a);
n = numel(c);
out = [a, c(randperm(n))];

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