347
identity theft (lemmy.dbzer0.com)
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[-] neidu3@sh.itjust.works 26 points 12 hours ago* (last edited 12 hours ago)

Could one of you scholars please explain the joke for us smoothbrains who don't get it? All I see is a boolean matrix, and I'm not even sure that is correct.

[-] Saleh@feddit.org 3 points 2 hours ago

You multiply vectors and matrizes row by column.

So for any matrix the fitting identity matrix multiplies each row on the relevant position by one and puts it into a column.

The matrix remains the same.

See example 5 here: https://www.geeksforgeeks.org/identity-matrix/

[-] Gustephan@lemmy.world 13 points 8 hours ago

Eigen see how this is confusing, I don't get it either

[-] zqwzzle@lemmy.ca 56 points 12 hours ago

A square matrix with the ones in the diagonal is called the identity matrix

[-] lugal@lemmy.dbzer0.com 35 points 12 hours ago

It's an identity matrix. You multiple a vector with it and the result is still the same (identical) vector

[-] ryedaft@sh.itjust.works 2 points 10 hours ago

It's like if you multiply or divide by one. Just a bit bigger cuz linear algebra.

[-] MichaelScotch@lemmy.world 12 points 11 hours ago

Identity theft is not a joke, Jim. Millions of families suffer every year. Also one that the internet gets wrong all the time: “dude, this is a Wendy’s”, not “sir this is a Wendy’s”

[-] subtext@lemmy.world 2 points 4 hours ago

I believe it’s actually, “dude, this is a Wendy’s restaurant.” Check and mate.

[-] MichaelScotch@lemmy.world 1 points 3 hours ago

Well done sir, well done… I mean dude

[-] massive_bereavement@fedia.io 3 points 10 hours ago

Bernstein bears

[-] NocturnalMorning@lemmy.world 3 points 12 hours ago

At least they're symmetric.

this post was submitted on 15 Mar 2025
347 points (98.6% liked)

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