Could you please stop translating existing Cody problems into Japanese? I might be too harsh on this, but you are ruining Cody in a way that the majority Cody players here cannot read Japanese. If you are teaching a MATLAB course in Japanese, I recommend you to start your course on Cody Coursework, where you can create your own problems in whatever languages you like.
FYI, Cody Coursework is here: https://www.mathworks.com/help/coursework/cody-coursework-for-instructors.html
Community is not limited to English-native people but widely open to people who mainly speak any languages. I create those problems since we had a request to have Japanese Cody questions. (This is a test phase yet, so please understand the situation.)
Currently, I add a tag for Japanese, but probably, we need a filtering feature like MATLAB Answers.
Everyone will have their own perspective, I'm sure. Personally I don't mind creation of non-English problems, because not everyone is (nor should be) fluent in English. Although I think it would be nice to have at least small differences to the existing problems. For example, if the original problem is to remove vowels, then you could create your own problem where the task is to instead remove consonants.
The Hitchhiker's Guide to MATLAB
Project Euler: Problem 6, Natural numbers, squares and sums.
Create a Multiplication table matrix...
Equal to their cube
Test Problem; Create a 5x5 array containing all ones
NaN (欠損値) が含まれている行を削除しよう
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