x=[1 2 3;
4 5 6;
7 8 9]
Select every other element of a vector
Make one big string out of two smaller strings
Getting logical indexes
Given a 4x4 matrix, swap the two middle columns
Replace every 3rd element in a vector with 4
Is it a mail?
Stop a ZigZag scanning N*N Matrix at any diag you want
Relation between functions "dec2bin" & "dec2binvec"
Divisible by 21
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