Cody

# Problem 1227. Generate a random matrix A of (1,-1)

Solution 1855563

Submitted on 22 Jun 2019 by Daniel Yago
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### Test Suite

Test Status Code Input and Output
1   Pass
x = 5; assert(isequal(unique(rand_plusminus1(x)),[-1;1]))

ans = 1 1 -1 1 1 1 1 1 1 1 1 1 1 1 -1 1 1 1 -1 -1 1 1 -1 1 -1

2   Pass
x = 1; assert(isequal(abs(rand_plusminus1(x)),1))

ans = 1

3   Pass
x = 0; assert(isequal(rand_plusminus1(x),[]))

ans = []

4   Pass
x = 999; assert(isequal(unique(rand_plusminus1(x)),[-1;1]))

ans = Columns 1 through 30 1 -1 1 1 1 -1 -1 -1 1 -1 -1 1 -1 1 1 1 1 1 -1 1 -1 1 -1 -1 1 1 -1 -1 -1 -1 1 1 -1 -1 1 1 1 -1 1 1 -1 1 1 1 1 -1 1 1 1 1 1 -1 1 1 1 1 1 1 1 -1 1 -1 1 1 1 1 1 1 1 -1 1 1 -1 1 1 1 -1 1 1 -1 -1 1 1 -1 1 1 -1 -1 1 1 1 1 -1 1 1 1 1 1 1 1 1 -1 1 1 1 1 1 1 1 -1 1 1 -1 1 1 -1 1 -1 -1 1 -1 -1 -1 1 1 -1 -1 -1 -1 1 1 1 1 1 -1 -1 1 1 -1 1 1 1 1 -1 -1 -1 -1 -1 -1 1 -1 1 -1 -1 1 1 1 1 1 1 1 1 1 1 1 -1 1 1 -1 -1 1 1 1 -1 1 1 1 -1 1 1 -1 1 1 -1 1 -1 1 1 -1 1 -1 1 -1 1 1 -1 1 1 -1 1 1 1 1 1 -1 1 1 1 1 1 -1 1 1 1 1 1 1 -1 -1 -1 -1 1 1 1 1 1 1 -1 1 1 1 -1 1 -1 1 1 -1 1 -1 1 -1 -1 1 1 -1 -1 1 -1 1 1 1 -1 1 1 1 1 1 1 1 1 1 -1 -1 1 1 -1 -1 1 1 -1 1 1 1 1 1 1 -1 1 1 1 -1 1 1 1 -1 1 1 1 1 1 1 1 1 1 1 -1 -1 -1 -1 1 1 1 1 -1 -1 1 -1 -1 -1 -1 -1 -1 1 1 -1 1 -1 -1 1 1 1 1 -1 -1 1 1 1 -1 1 1 1 1 1 1 1 1 1 1 -1 1 -1 1 -1 -1 -1 1 1 1 1 1 1 1 1 -1 1 1 -1 -1 1 1 -1 -1 -1 -1 -1 1 -1 -1 -1 -1 -1 1 -1 -1 1 1 -1 1 -1 -1 1 -1 -1 1 -1 1 1 1 1 1 -1 1 -1 1 1 1 1 1 -1 1 1 -1 -1 1 -1 -1 1 -1 1 1 1 1 1 -1 1 1 1 -1 -1 1 -1 1 -1 1 -1 1 1 1 1 1 -1 -1 1 1 1 1 1 1 1 1 1 1 1 1 -1 1 1 -1 -1 1 -1 -1 1 -1 -1 1 1 1 -1 -1 1 1 -1 1 1 1 1 1 -1 -1 1 -1 1 -1 -1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 -1 1 1 1 -1 1 -1 1 1 1 -1 1 1 -1 -1 1 1 -1 -1 -1 -1 1 1 1 1 -1 1 1 1 -1 1 -1 1 1 1 1 1 1 -1 -1 1 -1 1 1 -1 1 1 1 1 1 -1 1 -1 1 1 -1 1 1 -1 1 1 -1 1 -1 -1 1 1 -1 -1 -1 1 1 1 1 1 1 -1 1 -1 -1 1 1 1 1 -1 1 1 1 1 1 -1 1 -1 1 1 -1 1 1 1 -1 1 1 -1 -1 1 1 1 -1 -1 1 1 1 1 1 1 1 -1 -1 1 1 1 1 1 1 1 1 -1 1 1 1 1 1 1 1 1 -1 1 -1 1 -1 -1 1 -1 1 1 -1 1 -1 1 1 1 1 1 1 1 1 -1 1 -1 1 1 1 1 -1 1 -1 -1 1 1 1 -1 1 1 -1 -1 -1 -1 -1 1 -1 1 -1 1 1 1 1 1 1 -1 -1 1 1 -1 1 -1 -1 -1 1 1 1 1 1 1 1 1 1 -1 1 1 -1 1 1 -1 1 -1 1 -1 1 -1 1 1 1 1 1 1 1 1 -1 -1 -1 -1 -1 1 -1 -1 1 -1 1 1 1 1 1 1 1 1 -1 1 -1 1 1 1 -1 -1 1 -1 1 1 1 -1 1 1 -1 1 -1 -1 1 -1 -1 -1 -1 1 1 -1 -1 -1 -1 1 1 -1 1 -1 -1 1 -1 -1 1 -1 1 1 1 -1 -1 1 1 -1 1 1 1 -1 1 1 1 1 1 -1 -1 1 -1 1 1 -1 -1 -1 1 1 1 1 1 -1 1 -1 -1 -1 -1 1 1 1 -1 -1 -1 -1 1 1 -1 1 1 1 -1 1 -1 1 1 -1 -1 1 1 1 1 1 -1 1 1 1 1 1 1 -1 -1 1 1 -1 1 1 1 -1 -1 -1 1 1 1 1 1 -1 1 -1 1 1 -1 1 -1 -1 1 -1 -1 1 -1 -1 1 -1 -1 1 1 -1 -1 1 1 1 1 1 1 1 1 -1 1 1 -1 1 -1 1 1 -1 1 -1 -1 -1 1 1 -1 -1 1 1 1 1 1 -1 -1 1 1 -1 1 1 1 1 1 -1 -1 1 -1 1 -1 1 -1 1 1 -1 1 -1 1 1 1 -1 1 -1 1 1 1 -1 1 1 1 1 1 -1 1 1 1 1 1 1 -1 -1 1 1 1 1 -1 -1 1 1 -1 1 -1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 -1 1 1 1 -1 1 1 -1 1 -1 1 -1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 -1 -1 1 -1 1 1 1 1 -1 1 -1 1 -1 -1 1 1 1 -1 1 -1 1 1 -1 1 1 1 -1 1 -1 -1 1 1 1 1 -1 1 1 1 1 -1 1 1 1 1 -1 1 -1 1 1 1 -1 1 1 1 -1 1 -1 1 -1 -1 1 1 1 1 1 -1 1 1 1 1 1 -1 1 1 1 1 -1 1 1 1 1 -1 1 -1 1 -1 1 1 1 1 -1 1 1 1 1 -1 -1 1 1 -1 -1 1 1 1 1 1 1 -1 1 1 1 1 1 -1 1 1 -1 1 1 1 -1 1 -1 1 1 1 -1 1 1 1 1 1 1 1 1 -1 1 1 -1 -1 -1 -1 1 1 -1 1 1 1 1 1 1 1 1 -1 1 -1 1 1 1 1 1 1 1 1 1 1 1 -1 -1 1 -1 1 1 1 1 1 1 1 1 1 1 1 1 -1 -1 1 1 1 1 1 1 -1 -1 1 1 -1 1 1 1 1 -1 1 1 -1 1 1 1 -1 1 1 1 1 -1 1 1 1 1 1 1 -1 1 -1 1 1 1 1 1 -1 1 1 -1 1 -1 1 1 -1 1 1 1 1 1 -1 1 1 1 -1 -1 1 -1 1 -1 1 -1 1 1 1 -1 1 1 1 1 -1 1 1 1 1 1 1 1 1 -1 1 1 1 1 -1 -1 1 1 1 1 -1 1 1 1 -1 1 -1 1 -1 -1 -1 -1 1 -1 1 -1 1 1 1 -1 1 1 -1 1 1 1 -1 -1 1 1 -1 1 -1 1 -1 1 1 1 1 1 1 -1 1 1 -1 1 1 1 -1 1 -1 1 1 1 -1 1 1 -1 -1 1 -1 1 1 1 -1 1 1 1 1 -1 1 1 -1 -1 1 1 1 -1 1 1 1 -1 1 1 1 1 -1 1 -1 1 1 1 1 1 -1 -1 1 1 1 1 1 -1 1 -1 -1 1 -1 1 -1 1 1 1 1 1 1 1 1 1 1 1 -1 1 -1 1 -1 1 -1 1 1 1 1 1 1 -1 -1 1 1 -1 1 1 -1 -1 1 -1 1 1 1 -1 1 1 1 -1 -1 1 1 1 1 -1 1 1 1 1 -1 1 1 1 1 -1 -1 1 -1 1 1 1 -1 -1 -1 1 1 -1 1 -1 1 1 1 1 1 1 -1 1 1 1 1 -1 -1 -1 1 -1 -1 1 1 -1 1 -1 1 -1 1 1 1 1 -1 -1 1 1 1 -1 1 1 1 1 1 -1 -1 1 1 1 1 1 1 1 -1 1 -1 -1 -1 1 1 -1 -1 1 -1 -1 -1 -1 -1 1 1 1 1 1 -1 -1 -1 1 -1 1 1 1 -1 1 1 1 1 -1 -1 -1 1 1 -1 1 1 1 1 -1 1 -1 1 1 -1 1 1 1 1 1 1 -1 1 -1 -1 -1 -1 -1 1 1 1 1 1 1 1 -1 -1 1 -1 1 1 -1 1 -1 1 -1 1 1 -1 -1 1 1 1 1 1 1 -1 1 -1 -1 -1 -1 -1 -1 1 1 1 1 1 1 1 1 1 -1 1 1 -1 1 1 1 -1 1 -1 -1 1 1 1 -1 1 -1 -1 1 -1 ...