change the signs of the even index entries of the reversed vector
vec = [4 -1 -2 9]
ans = [9 2 -1 -4]
vec = [-4 -1 -2 -9]
ans = [-9 2 -1 4]
The test suite has been expanded.
Omit columns averages from a matrix
Set a diagonal
Count up then down
Try 1.5.4: Celsius to Fahrenheit
Sort complex numbers into complex conjugate pairs
Duplicate a character
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