This problem has been polished along with an enhanced test suite.
nice moderate problem
pressure to dB?
Create a square matrix of multiples
Angle between Two Vectors
Set some matrix elements to zero
Solve expression III
Replace x value into y value in string text.
For given xx,x, y vectors build spline of x and y and find yy values for xx vector.
Pointwise multiplication of vectors.
Display positive elements of matrix.
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