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fossilesque@lemmy.dbzer0.comM to Science Memes@mander.xyzEnglish · 3 个月前

identity theft

lemmy.dbzer0.com

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identity theft

lemmy.dbzer0.com

fossilesque@lemmy.dbzer0.comM to Science Memes@mander.xyzEnglish · 3 个月前
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  • neidu3@sh.itjust.works
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    3 个月前

    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.

    • zqwzzle@lemmy.ca
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      3 个月前

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

    • lugal@lemmy.dbzer0.com
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      3 个月前

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

    • Gustephan@lemmy.world
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      3 个月前

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

    • pseudo@jlai.lu
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      That matrix of zeros with one in diagonal is called the matrix of identity.
      It is famous because when doing multiplication on matrix or vector, it acts likes 1 on “normal” number:
      x times 1 is x.
      anyMatrix times Identity is anyMatrix.

      • fallingcats@discuss.tchncs.de
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        3 个月前

        Wouldn’t you need to put anyMatrix first, since matrix multiplication isn’t commutative?

        • pseudo@jlai.lu
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          3 个月前

          You are right. I will correct it.

          • fallingcats@discuss.tchncs.de
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            3 个月前

            No I just tried it and I was wrong, it seems like it doesn’t matter for the ID matrix specifically

            • pseudo@jlai.lu
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              3 个月前

              I need to freshen up on my linear algebra. I don’t remember on which sense it goes but I think if you swap the factors, you’ll have to you transpose the matrix x to keep the same result.

        • MBM@lemmings.world
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          3 个月前

          Huh? Identity times anyMatrix is also anyMatrix. The matrix just has to have the right dimensions

    • Saleh@feddit.org
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      3 个月前

      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/

    • ryedaft@sh.itjust.works
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      3 个月前

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

  • MichaelScotch@lemmy.world
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    3 个月前

    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”

    • massive_bereavement@fedia.io
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      3 个月前

      Bernstein bears

    • subtext@lemmy.world
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      3 个月前

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

      • MichaelScotch@lemmy.world
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        Well done sir, well done… I mean dude

  • pseudo@jlai.lu
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    3 个月前

    Thank you OP!

  • NocturnalMorning@lemmy.world
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    3 个月前

    At least they’re symmetric.

  • Trollception@sh.itjust.works
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    3 个月前

    Uhh who’s joking about identify theft?

    • Akasazh@feddit.nl
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      3 个月前

      Your username is incredibly apt here

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