This problem has been polished along with an enhanced test suite.
Find the numeric mean of the prime numbers in a matrix.
Remove any row in which a NaN appears
find radius of cone
Is it an Armstrong number?
Calculate Inner Product
Sum positive elements of matrix.
Opposite task convert string hexadecimal numbers array into array of decimal numbers .
Select primes from the matrix.
Count given word x in text.
Delete x value in given vector y.
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