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24-Ruby IV
ValeryOchkov24-Ruby IV
24-Ruby IV
September 10, 2021
Question

Sum in Mathcad Prime

  • September 10, 2021
  • 1 reply
  • 4922 views

Is it an error in Mathcad Prime?

Summa.png

Summa-1.png

1 reply

S
StuartBruff23-Emerald V
23-Emerald V
September 10, 2021

Odd, Valery.  It seemed to work on my Prime 7.0.0.0 Trial.

 

2021 09 10 A.png

 

Stuart

    L
    LucMeekes23-Emerald IV
    23-Emerald IV
    September 10, 2021

    Stuart,

     

    Not odd. The 'magic' is in the fact that Valery put an evaluation (=) after the range definition of i. That changes the range to a vector. This is a special feature of Prime.

    With that evaluation your sheet shows:

    LucMeekes_0-1631307705393.png

    The summation with a single i at its bottom, requires i to be a range; vector is not allowed.

     

    Success!
    Luc

      S
      StuartBruff23-Emerald V
      23-Emerald V
      September 23, 2025

      I assure you that, as a Brit, I consumed devilish humour along with my first teething rusks.  And being ex-military means that I have to consciously rein it in. 😈

       

      However, dealing with the last bit first, sorting.  AFAIA, Mathcad 11 and Mathcad Prime ignore the imaginary component of a complex number.  I dug out an old M11 mergesort worksheet that allowed me to play with different sorting options.   Naturally, it is broken under Mathcad Prime - I suspect a Boolean shortcut difference is the cause, but I can't see it.   Instead, I've used an alternative approach to provide various options for sorting complex numbers.

       

      (You can tell how old the original worksheet is from the reference to Axum S-Plus!  I haven't posted the worksheet, because it's a bit of a slapdash thing even by my standards, with expressions dumped where I could find a space)

       

      2025 09 23 D.png

       

      2025 09 23 E.png

       

      2025 09 23 F.png

       

      I plugged my all-singing, all-dancing vec into max and min, and that seems to work for some cases of lack of interest.  However, there are couple of more that I need to address, and my current solutions are, at best, 'clumsy', if I'm being charitable.

       

      Stuart

       

      PS.  If anyone spots any discrepancies or errors, please post your comments in a Spoiler section and set a 24-hour time lock on it.  My poor brain can't cope with any more thinking today.

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