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MN_100085361-Visitor
1-Visitor
Aug 22, 2022 2:07 PM UTC
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Trouble with simple explicit all equation

Hi does anyone know this issues?

Werner_E
Werner_EAnswer
25-Diamond I
Aug 22, 2022 2:54 PM UTC

So obviously something get worse on the way from P6 to P8.
In P6 the numerical evaluation after the symbolic "explicit" works OK even though the symbolic had turned the unit meter into a variable. And it works even though the calculation option "Units/Constants in Symbolics" is not checked!

Werner_E_0-1661180065643.png

 

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4 replies

LucMeekes23-Emerald V
23-Emerald V
Aug 22, 2022 2:22 PM UTC

Hey Mark,

 

First off: You should attach your Prime worksheet, not just a picture.

 

To answer your question: Yes.

This is what you normally get:

LucMeekes_0-1661177913352.png

In my (the above) case, variables are in blue italic, units are in blue roman (upright) font.

What you see is that the symbolic engine of Prime doesn't understand the units for metre, it converts them to variables, and the variable m is undefined, hence Prime cannot (numerically) calculate the result.

There is a setting under the Calculation tab, to have Prime understand units in symbolics, but that does not always work...

 

Success!
Luc

 

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    Werner_E
    Werner_E25-Diamond IAnswer
    25-Diamond I
    Aug 22, 2022 2:54 PM UTC

    So obviously something get worse on the way from P6 to P8.
    In P6 the numerical evaluation after the symbolic "explicit" works OK even though the symbolic had turned the unit meter into a variable. And it works even though the calculation option "Units/Constants in Symbolics" is not checked!

    Werner_E_0-1661180065643.png

     

    Translate
      LucMeekes23-Emerald V
      23-Emerald V
      Aug 22, 2022 3:05 PM UTC

      Prime 7:

      LucMeekes_0-1661180693306.png

      One more item to add to the list of Improvements Changes going from Prime 7 to 8...

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