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ptc-45323311-Visitor
1-Visitor
April 2, 2012
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Explicit calculations

  • April 2, 2012
  • 1 reply
  • 10910 views

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.

Best answer by AlanStevens

Scott Horowitz wrote:

... how did you get the arrow to display in the SA calculations at the top? ...

Just use the Symbolic menu (the mortar board hat) and choose the arrow. Alternatively use 'Ctrl.' (that's Ctrl and a period).

Alan

1 reply

A
AlanStevens19-Tanzanite
19-Tanzanite
April 2, 2012

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.

M
mzeftel1-Visitor
1-Visitor
April 3, 2012

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

explicit.png

Mona

P
ptc-45323311-VisitorAuthor
1-Visitor
April 3, 2012

I replied to Alan but I wanted to respond to you, too and hopefully Alan will see this.

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?

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