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r_solsot091-Visitor
1-Visitor
April 4, 2022
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Plotting a picewise function on mathcad 8

  • April 4, 2022
  • 2 replies
  • 3485 views

Hello, 

I am getting this error when trying to plot piecewise funtions. I've search trhough the coummity for may solutions but I  can't solve my problem at all.  Could you please help me?

 

I attatch the mdcx and a pdf of the function.

Thank you.

screenshot.png

Best answer by StuartBruff

One cause of the problem is that not all cases are covered (eg, 0 s).  I'd have used an elseif statement rather than evaluating each condition.   In addition, I'd have also used an explicit range variable to handle t.

 

2022 04 04 a.png

 

Stuarr

 

2 replies

S
StuartBruff23-Emerald VAnswer
23-Emerald V
April 4, 2022

One cause of the problem is that not all cases are covered (eg, 0 s).  I'd have used an elseif statement rather than evaluating each condition.   In addition, I'd have also used an explicit range variable to handle t.

 

2022 04 04 a.png

 

Stuarr

 

    R
    r_solsot091-VisitorAuthor
    1-Visitor
    April 5, 2022

    Exellent. This worked out for me. I was trying something similar, it seams I was missing 2Tsw/100 when defining t.

    Many thanks Stuart

    W
    Werner_E25-Diamond I
    25-Diamond I
    April 4, 2022

    Actually Prime isn't as good in dealing with units as we often would like it to be - especially when it comes to plotting.

    Primes quickplot feature only works unitless.

    One way (not preferred) is to make the values unitless:

    Werner_E_0-1649077051273.png

    The preferred way is, as Stuart already had shown, to define a range variable for plotting. You can delete the end values on the axis as Prime will chose them appropriately itself. This also enables you to chose different units like the "ms"  for the abscissa values in the following screenshot

    Werner_E_1-1649077207156.png

     

     

      W
      Werner_E25-Diamond I
      25-Diamond I
      April 4, 2022

      Afterthought

      Here is a simpler way of dealing with the periodicity of the signal

      Werner_E_0-1649078148866.png

       

      It might also make sense making delta, V.max and T arguments of the function

      Werner_E_0-1649085725008.png

       

        S
        StuartBruff23-Emerald V
        23-Emerald V
        April 5, 2022

        And if all you have is Express 7, or want to try for the daily obfuscation prize, ...

         

        2022 04 05 b.png

         

        Stuart

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