行列が与えられたときに、その行列内の素数の平均を計算する関数を作成しましょう。
例:
入力の行列が in = [ 8 3 5 9 ] のとき、 出力が 4 あるいは (3+5)/2 のようになります。
- (英語版) Problem 14. Find the numeric mean of the prime numbers in a matrix. https://www.mathworks.com/matlabcentral/cody/problems/14
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