Sum of first n terms of a harmonic progression
Replace multiples of 5 with NaN
Divide by 4
Find sum of negative elements in row.
Average of corner elements of a matrix (★★)
Doubling elements in a vector (★★)
Generate n equally spaced "intervals" between -x and x (★)
Swap the first and last columns (★★)
Vector raised to a power, element-wise (★)
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