Hello! In qalc I can do calculations using measuring units like this:

> 5 W * 3 s

  (5 watts) × (3 seconds) = 15 J

I’d like to be able to do something similar also in GNU Octave. I think the symbolic library could be a place to look at, but I found nothing “already done”. Do any of you know of a way to achieve this functionality?

    • tubbaduOP
      3•6 months ago

      It looks interesting, but more focused on conversions than actual operations it seems:

      octave:37> a.value = 100
a =

  scalar structure containing the fields:

    value = 100
    unit = W

octave:38> a.unit = 'W'
a =

  scalar structure containing the fields:

    value = 100
    unit = W

octave:39> b.value = 3
b =

  scalar structure containing the fields:

    value = 3
    unit = s

octave:40> b.unit = 's'
b =

  scalar structure containing the fields:

    value = 3
    unit = s

octave:41> a*b
error: binary operator '*' not implemented for 'scalar struct' by 'scalar struct' operations
        • tubbaduOP
          4•6 months ago

          This looks very VERY promising! I’ll try to install it tomorrow and Post here the results! Thanks?

        • tubbaduOP
          2•6 months ago

          I downloaded it and tried to run it, but it gets stuck in a loop and I don’t know how it could be fixed:

          error: max_recursion_depth exceeded
error: called from
    baseUnitSystem
    <unknown>

          it seems the problem is in the line

          coreUnits = buildCoreUnits(u.baseUnitSystem);

          in the file u.m, I think because u.baseUnitSystem tries to “call itself”. I don’t know what this should be supposed to do, and have no idea on how to possibly fix it :(

      • tubbaduOP
        2•6 months ago

        automatically no, but perhaps there’s a way to replace it. If there’s a way to check if a variable is “divisible by another symbolic one” then it would be not so hard to implement this behavior