How to create a random matrix?

2022 10 6
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更新时间：2022 10 7
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I am creating a SVD matrix UEV*. For that I want to create an E matrix with diagonal enteries in the range of [0,1] and also in increasing order. Can someone kindly suggest me a way to do so!

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回答（1 个）

John D'Errico
John D'Errico 2022-10-6
编辑：John D'Errico 2022-10-6

0 个投票

Can you generate a vector of numbers that all lie in the interval [0,1]? (I hope so. read the help for rand.)
Can you insure that vector of numbers lie in increasing order? (Again, I hope so. help sort)
Can you create a diagonal matrix, given a vector? (Again, help diag.)
The point is, when you have a problem that is too big for you to chew on, then break it down into smaller problems. Eat a programming elephant (even a small one) one byte at a time.

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Anshuman
Anshuman 2022-10-6
Great approach! Thanks a lot!
Anshuman
Anshuman 2022-10-6
I am finding this dissambiguity in answers on taking the (.*) relation or not takin it with the product (*) why this happens?
U = rand(50);
V = rand(50);
d = rand(50,1);
s = sort(d);
e = diag(s);
A1 = U*e*(V)';
A2 = U.*e*(V)';
A3 = U.*e.*(V)';
Torsten
Torsten 2022-10-6
编辑：Torsten 2022-10-6
All multiplications are pure matrix multiplications *. No room for elementwise multiplication .*
Anshuman
Anshuman 2022-10-7
Okay thanks for te definitions! Great!

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Anshuman
Anshuman
2022-10-6

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2022-10-7

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