micnd90 [he/him,any]

  • 1 Post
  • 30 Comments
Joined 4 years ago
Cake day: August 17th, 2020
  • micnd90 [he/him,any]@hexbear.nettoScience Memes@mander.xyz•Just TerribleEnglish
    4·
    17 days ago

    When you say the first element of a matrix, first implies one and not zero. This is how linear algebra was invented (on paper, by a human mathematician), taught, and passed down to fellow humans.

    Starting indexes at zero stem from the lineage of C programming and binary nature of computer. For example,

    Computer memory addresses have 2^N cells addressed by N bits. Now if we start counting at 1, 2^N cells would need N+1 address lines. The extra-bit is needed to access exactly 1 address. (1000 in the above case.). Another way to solve it would be to leave the last address inaccessible, and use N address lines.

    This is why, math and physics people who learn linear algebra and matrix calculus learn to index at 1 (on a piece of paper) while computer science programmers index at 0.

  • micnd90 [he/him,any]@hexbear.nettoScience Memes@mander.xyz•Just TerribleEnglish
    28·
    18 days ago

    MATLAB is for matrix calcs. Matrix indices start at 1, fight me. Given a matrix X of m x n size, you write

    Matlab has many issues, amongst other accessibility (which can be remedied by piracy), closed-software, but as a program designed to do computational matrix manipulation, starting at index 1 is literally correct. This is how you learn matrix indices in intro linear algebra. How is it make sense then you use a software to assist computation and start indexing at 0, while you write the equations and indices on a piece of paper you start at 1. CS majors go home.

  • micnd90 [he/him,any]@hexbear.nettoFuck Cars@lemmy.ml•The NYTimes is once again trashing the most promising mobility innovation of the 21st centuryEnglish
    832·
    5 months ago

    Elijah Orlandi makes deliveries for Grubhub in the evening after his 9-to-5 job.

    “There are scenarios where people have the right to be upset,” said Orlandi, who lives in the Bronx and has been making e-bike deliveries for Grubhub — in addition to his 9-to-5 job — since October. He has seen e-bike riders “swerving in between cars and all that kind of stuff.” But Orlandi is also hoping for compassion. “People got to understand, we’re working,” he said. Delivery apps, he noted, keep track of how quickly workers make their drop-offs — and ding them if they take too long. “Sometimes you’ll be going somewhere and Grubhub will send you another order, and then no matter what you do, you’re going to be late,” he said. “So that’s why you’ll see a lot of people rushing.”

    Surely the problem here this dude’s e-bike. Not that people need to do gig job on top of 9-5 work day, unaffordable rent, inflation, and exploitative gig economy platform