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

## 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.

• 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:

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.

• 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.

Mona

• 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:

Alan

• 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!

#### More Like This

• Retrieving data ...

#### Legend

• Correct Answers - 3 points