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Showing the underlying equations 3

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LarsBlesvik

LarsBlesvik

Petroleum
Joined
Oct 12, 2011
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Hi all,

When working with code checks there are often multiple formulas given a set of variables. For instance DnV (Norwegian certification agency) gives a resulting sling force with one padeye as:

RSF:=1.4*F

Whereas with 2 to 4 padeyes it would be:

RSF:=1.2*SKL*PL*F/cos(v)

There is no problem in writing an if statement to choose the correct value, but when presenting a report on this I would like to be able to write the if statement off the printed area, and still get the symbolic result presented, something like this:

n:=4

(hidden)

RSF:=if(n=1,1.4*F,1.2*SKL*PL*F/cos(v))

(hidden end)

RSF=1.2*SKL*PL*F/cos(v)=Numerical value

This would make it possible for me to generate a less "cluttered" report to present.

Any ideas?
 
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Why don't you just use Insert->Area and hide it in there?
 
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@Occupant: The challenge has not been to keep the calculations hidden, but to get the end result displayed correctly :)

@jghrist: thanks for a nice looking suggestion, it looks like a good way of doing it, but it still isn't able to display the solution formatted as an equation, is there any way of doing that?
 
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it looks like a good way of doing it, but it still isn't able to display the solution formatted as an equation, is there any way of doing that?
Click to expand...
Not that I know of. You might try fooling around with bitmap images and different control objects.
 
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Have to add: the only fly in the ointment with my approach is that you have to use refresh every time you change n.
 
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@Occupant: Can you post the mathcad version of that last one?

Lars
 
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@Occupant: Thanks a lot for your help so far, but I am seriously baffled by this. I try to replicate your calculation, but instead of symbolics, all variables are exchanged for numbers, is there any hidden preference or keyword I can't see in this?
 
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The key is to not define the independent variables before the dependent variable is defined. Variables that are defined (like n) are evaluated and not shown in the symbolic result.

Notice that in Occupant's attachment, v, SKL, PL, and F are defined after the (hidden) RSF formula.
 
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Thanks a lot everybody! It worked out pretty neat!

Just a quick extra question: Anybody know WB script to change textbox colour and appearance?

Lars
 
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