How to calculate the modulus of 2x3 matrix

Asked Aug 03 '21 at 06:36

Active Aug 03 '21 at 06:36

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This may be a very basic question but I could not find a reasonable answer on the internet. In Andrew NG Coursera course there are equations

I don't understand how this is being calculated. They have given the python function, but what is the math behind it?

So my main question is how to calculate ||x|| here.

asked Aug 03 '21 at 06:36

Adnan Ali

By definition $| (x_1, x_2, x_3)| = \sqrt{x_1^2 + x_2^2 + x_3^2}$. – Arctic Char Aug 03 '21 at 06:41
i get it. it was so easy. but i did not get the point. should i delete the question ? – Adnan Ali Aug 03 '21 at 06:48
I would not delete the question as maybe other people are having the same question. – Steven01123581321 Aug 03 '21 at 06:50
@Steven01123581321 I agree, but sometimes people downvote easy questions. that discourage to ask again :P . Well, I don't delete it. I hope it will be useful for someone. – Adnan Ali Aug 03 '21 at 06:55
I upvoted it ;) – Steven01123581321 Aug 03 '21 at 06:56
So nice of you :) – Adnan Ali Aug 03 '21 at 07:06

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