Amitava, it is fantastic that you are contributing problems, but you really need to spend more time specifying what the solution should do. The person solving is left needing to guess too much.
Definitely Agree with the cyclist. W/o example it is impossible to understand the task to achieve.
The DC component of a signal is usually its mean. Now filter can have many meanings, but in this case, it means to remove the signal variation.
Return a list sorted by number of occurrences
Replace NaNs with the number that appears to its left in the row.
Get the length of a given vector
Find the index of the largest value in any vector X=[4,3,4,5,9,12,0,4.....5]
Least common multiple of many numbers
Energy of a photon
Angle of triangle
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