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IN_Naga8-Gravel
8-Gravel
Jul 23, 2025 3:50 PM UTC
Solved

Solving for Unknown Matrix Variable in MathCad Prime 11 Solve Block

Hello everyone,

I'm attempting to determine the unknown variable V_Node from an equation involving 3x1 matrices.

I'm currently using a solve block for this purpose, but I'm not getting any calculated result.

 

Could anyone please help me identify where I might have made a mistake in the solve block? I've attached the MathCad Prime 11.0.0 (.mcdx) file for reference.

 

Thank you in advance for your assistance!

Werner_E
Werner_EAnswer
25-Diamond I
Jul 23, 2025 4:11 PM UTC

You have to apply the correct unit (volt) at your guess vector.

And don't use the boolean (comparison) equal (the fat one) if you want to show the value of the result.

Either use the 'normal' equal sign or do without and evaluate the solution in a separate region after the solve block.

BTW, the definitions of your variables and vectors should better be placed in front of the solve block. So the solve block only contains the guesses and the equation(s) to solve.

Werner_E_0-1753287051991.png

 

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6 replies

terryhendicott
terryhendicott21-Topaz II
21-Topaz II
Jul 23, 2025 4:01 PM UTC

Capture.JPG

Simply a missing unit.

Cheers

Terry

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    IN_Naga8-GravelAuthor
    8-Gravel
    Jul 25, 2025 1:27 PM UTC

    Thanks for the Solution, It was of Great help.  😀👍

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    Werner_E
    Werner_E25-Diamond IAnswer
    25-Diamond I
    Jul 23, 2025 4:11 PM UTC

    You have to apply the correct unit (volt) at your guess vector.

    And don't use the boolean (comparison) equal (the fat one) if you want to show the value of the result.

    Either use the 'normal' equal sign or do without and evaluate the solution in a separate region after the solve block.

    BTW, the definitions of your variables and vectors should better be placed in front of the solve block. So the solve block only contains the guesses and the equation(s) to solve.

    Werner_E_0-1753287051991.png

     

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      Werner_E
      Werner_E25-Diamond I
      25-Diamond I
      Jul 23, 2025 4:26 PM UTC

      You may also consider using the "root" function instead of the solve block and you may also turn the whole calculation into a function in all  14 input variables. That way you could always evaluate it for any values you like and of course also vectorized with your vector inputs:

      Werner_E_0-1753287943166.png

      Prime 11 worksheet attached

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        IN_Naga8-GravelAuthor
        8-Gravel
        Jul 25, 2025 1:28 PM UTC

        This method is new to me; Will try and experiment for answer with this method also; Thanks 😀

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