• neidu3@sh.itjust.worksEnglish
    0·
    4 months 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.

    • zqwzzle@lemmy.caEnglish
      1·
      4 months ago

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

    • lugal@lemmy.dbzer0.comEnglish
      1·
      4 months ago

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

    • pseudo@jlai.luEnglish
      0·
      3 months ago

      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.