I notice that p=isprime(x) can be a lot slower than p=ismember(x,primes(max(x))); for x=1:1e7, the former takes about 100 seconds and the latter takes about 0.1 seconds.
Nice observation. I'll keep that one in mind.
First non-zero element in each column
Derivative of polynomial
Test Problem; Create a 5x5 array containing all ones
Construct a continued fraction for a square root
Determine whether a prime is Pythagorean
Evaluate the zeta function for real arguments > 1
Test the generalized Legendre conjecture
List the titles of Cody problems
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