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1758 Views 16 Replies Latest reply: Apr 9, 2012 12:31 PM by ptc-4532331 RSS
ptc-4532331 Copper 9 posts since
Apr 2, 2012
Currently Being Moderated

Apr 2, 2012 1:03 PM

Explicit calculations

Good afternoon All,

 

I understand the basics of explicit functions in MathCAD, however I am not able to figure out how to have an equation list the numerical values of each variable included in an equation. For instance, I am trying to calculate the total surface area of a concrete storm sewer junction box to determine the total formwork needed. The total surface area would be calculated as the sum of the exterior/interior 4 sides and exterior/interior top and bottom. The following is an example of my workflow:

 

a=sides=2 ft^2

b=top=3 ft^2

d=bottom=4 ft^2

 

f=total=a+b+d

 

I would like the valuves of a,b and d listed in my equation. When I attempt the explicit calculation I type: f=a+b+d, explicit,a,b,d. The result I receive is: f=a+b+c,explicit,a,b,d-->a,b,d=9 ft^2. How can I have the explicit function show: f=a+b+c=2 ft^2+3 ft^2+4 ft^2=9 ft^2?

 

 

The tutorial sheets in MathCAD do not show how to have an equation show the values, only the operation shown (i.e. F1=1, A1=2, F1/A1, explicit, F1, A1 --> 1/2=0.5)

 

Does anyone have an answer or suggestion?

 

Thank you and I apologize for any confusion.

  • AlanStevens Platinum 1,278 posts since
    Jun 8, 2010
    Currently Being Moderated
    Apr 2, 2012 3:03 PM (in response to ptc-4532331)
    Re: Explicit calculations

    This is what I get in M15:

     

    Explicit.png

    What version of Mathcad are you using?

     

    Alan

     

    NB Also, by right-clicking on the symbolic evaluation you can choose to show the evaluation with = signs rather than arrows.

    • mzeftel Gold 2,704 posts since
      May 11, 2010
      Currently Being Moderated
      Apr 3, 2012 8:43 AM (in response to AlanStevens)
      Re: Explicit calculations

      I get the same results as Alan in Mathcad Prime 2.0.

       

       

      explicit.png

       

      Mona

        • AlanStevens Platinum 1,278 posts since
          Jun 8, 2010
          Currently Being Moderated
          Apr 3, 2012 11:57 AM (in response to ptc-4532331)
          Re: Explicit calculations

          Scott Horowitz wrote:

           

          Below is the actual formulas and variables I used. In lieu of "a" I used SA (for surface area) with the subscript to differentiate between sides, top and bottom. I'm using different numbers for simplification of my question.

           

          SA.top := 8ft*4ft

          SA.top = 32ft^2

           

          SA.bottom := 8ft*4ft
          SA.bottom = 32ft^2

           

          SA.sides :=10ft*8ft

          SA.sides = 80ft^2

           

          SA.total := SA.top + SA.bottom + SA.sides

           

          The next line shows the result that I receive when trying to apply the explicit function:

           

          SA.total, explicit, SA.top, SA.bottom, SA.sides ------> SA.top, SA.bottom, SA.sides

           

          I do get numerical values for the example I provided in my original post but I do not get any numerical values in my worksheet for the workflow above, even if I applied the explicit function to the SA.total equation I show above, right below the variables. 

           

          Do you have any suggestions?

          Explicit needs to be used where you calculate SA.total:

          Explicit2.png

          Alan

            • AlanStevens Platinum 1,278 posts since
              Jun 8, 2010
              Currently Being Moderated
              Apr 3, 2012 12:18 PM (in response to ptc-4532331)
              Re: Explicit calculations

              Scott Horowitz wrote:

               

              I tried that also but see that where the variables are inserted, the operations are printed for each variable, and not the numerical value for each variable. Instead of 32 ft^2 for SA.top the explicit function shows 8ft*4ft.

              I see what you mean. You might be stuck with this!

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