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5 votes

How to create all $1$'s vectors of length $n$ without using Tuples[]?

The direct code which seems to give the requested output is ones = Tuples[{1},4]; identity = IdentityMatrix[4]; matrix = Join[ identity, ones] (* {{1, 0, 0, 0}, {0, 1, 0, 0}, {0, 0, 1, 0}, {0, 0, 0, 1} …
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