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ptc-44512681-Visitor
1-Visitor
May 2, 2012
Question

Create a lookup table from this graph?

  • May 2, 2012
  • 1 reply
  • 7826 views

Hello,

I have this graph attached below. I want to be able to just specify e/D and have mathcad spit out K. What is the easiest way to do this? Maybe some sort of lookup table? I'm not sure.

gep183kgraph.GIF

1 reply

M
MichaelH1-Visitor
1-Visitor
May 2, 2012

Create a table with a few basic points and use an interpolation function.

For this curve, linterp (linear interpolation) should be adequate.

P
ptc-44512681-VisitorAuthor
1-Visitor
May 2, 2012

I think I understand. So column 0 would be e/D and column 1 would be K. I would use:

linterp(vx, vy, x)

where vx is column 0 and vy is column 1 and x is my e/D value?

M
MichaelH1-Visitor
1-Visitor
May 2, 2012

Yes.

The "Help" files have many worked examples (called "Quick Sheets") for these kinds of things.

You should look at them whenever possible.

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