make all the elements in given x zero.
Simple but fun
I'm not sure this would work if there is a 0 in x...
Remove any row in which a NaN appears
Back to basics 8 - Matrix Diagonals
Generate N equally spaced intervals between -L and L
Create a vector
find the 'M'
Sum the rows
Where is the number that you want to find?
Make an identity matrix whose diagonal elements are 1:n
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