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LH_137830264-Participant
4-Participant
Jul 10, 2025 12:13 PM UTC
Solved

Plot line has missing segments

Hi all, 

 

I have an issue with plotting a function on Mathcad Prime 11. For some reason there are missing segments in the plots of my shear-force diagrams. I'm not sure why this is happening, other plots I have made seem to work fine - any guidance would be much appreciated. 

 

The plots and respective functions are on pages 9 and 17 of the attached document. Thanks in advance

 

LH_13783026_0-1752149373039.png

 

terryhendicott
terryhendicottAnswer
21-Topaz II
Jul 10, 2025 12:31 PM UTC

Hi,

Include the two points of legs in the vector of x2.  In the following worksheet have done this.

Capture.JPG

Cheers

Terry

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5 replies

terryhendicott
terryhendicott21-Topaz IIAnswer
21-Topaz II
Jul 10, 2025 12:31 PM UTC

Hi,

Include the two points of legs in the vector of x2.  In the following worksheet have done this.

Capture.JPG

Cheers

Terry

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    LH_137830264-ParticipantAuthor
    4-Participant
    Jul 17, 2025 9:26 AM UTC

    Hi Terry, 

    Thanks for your response, I now realise that the increments I had used for x and x2 were too large, effectively skipping the points where those loads were applied. 

     

    Many thanks

    LH

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    Werner_E
    Werner_E25-Diamond I
    25-Diamond I
    Jul 10, 2025 3:12 PM UTC

    What Prime is doing is mathematically correct - a vertical line can never be the graph of a function. A step means that there is nothing inbetween.

    But I understand that you are used to see that vertical line segment.

    Solution is to use a vector for the abscissa values instead of a range. In Prime 11 you can use the convenient "vec" function to convert a range into a vector.

    Using the vectors solves your problem.

    It depends on the way the functions V and V2 are defined if vectorization when calling them with a vector argument is mandatory. In your case it would not be necessary as Prime would apply automatic implicit vectorization, but I consider it good style to explicitly apply vectorization.

    Werner_E_0-1752160321823.pngWerner_E_1-1752160334906.png

     

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      LH_137830264-ParticipantAuthor
      4-Participant
      Jul 17, 2025 9:27 AM UTC

      An interesting solution. I'll have to give this a try, seems like a nice clean way of handling this issue. 

       

      Many thanks

      LH

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      Werner_E
      Werner_E25-Diamond I
      25-Diamond I
      Jul 17, 2025 2:55 PM UTC
      @LH_13783026 wrote:

      An interesting solution. I'll have to give this a try, seems like a nice clean way of handling this issue. 

       

      Many thanks

      LH

      Yes.

      Actually Terry also used vectors instead of ranges in his solution. I just wanted to show that its not necessary at all to add the two special values.

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