Well, spotted, thanks
On Thursday, 6 March 2014 13:37:10 UTC+2, Paul Schreiner wrote:
> The problem seemt to be:
>
> in LinInterpolate, xRange and yRange are declared as "variant"
> when you pass xRange as Range("B3:B44").Value,
> you're passing an ARRAY, so xRange becomes an Array variable.
>
> an Array variable doesn't HAVE the property of: xRange.Cells.Count
> because xRange (as an Array) doesn't HAVE "Cells".
>
> You have to pass the data as a Range.
>
> as in:
> Cl_Array(1) = LinInterpolate(60, Sheets("AIRFOIL_DATA").Range("B3:B44"),
> Sheets("AIRFOIL_DATA").Range("C3:C44"))
>
> (leaving off the .Value)
>
> However, that's going to cause you a problem with:
> Cells(45, 5) = LinInterpolate(70000, Cl_Array, Cl_Array)
>
> I think you're going to have to either:
> Rewrite LinInterpolate to operate on Arrays,
> or create a second version that uses Arrays instead of Ranges.
>
> *Paul*
> -----------------------------------------
>
>
>
>
>
>
>
> *“Do all the good you can,By all the means you can,In all the ways you
> can,In all the places you can,At all the times you can,To all the people
> you can,As long as ever you can.” - John Wesley*
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>
> *From:* Gerrit Grundling <totallyp...@gmail.com <javascript:>>
> *To:* excel-...@googlegroups.com <javascript:>
> *Sent:* Thursday, March 6, 2014 2:32 AM
> *Subject:* $$Excel-Macros$$ Re: "Two-dimensional" interpolation
>
> Slowly but surely I'm getting there. Thanks for the help so far.
>
> I am including an Excel file with the airfoil data, function
> "LinInterpolate" and functions "Floor" and "Ceiling". None of these are my
> own, as I found them on the interweb.
>
> I have commented out my attempt at automating the linear interpolation
> process, although I suspect it actually works after all of the above.
> However, I am now getting "error 424: Object required" It seems the arrays
> don't enter "LinInterpolate".
>
> On Monday, 3 March 2014 21:21:45 UTC+2, Rajan Verma wrote:
>
> Hi
>
> make your array as "double" data type not "Long"
>
> Thanks
> Rajan.
>
>
>
>
> n Wednesday, 26 February 2014 07:07:45 UTC-7, Gerrit
> Grundling wrote:
>
> Greetings, all
>
> I have attached some aerofoil data for a Clark Y foil. This data is also
> available in my spread sheet.
>
> The Reynolds number is given in the heading as
> 5.00E+04, 1.00E+05, 5.00E+05, 1.00E+06 and 3.00E+06. I need to find Cl and
> Cd at an AoA for a Reynolds number:
>
> GetCl(AoA, Re)
> GetCd(AoA, RE)
>
> Interpolation functions are easy enough to find.
> Here<http://www.vbaexpress.com/forum/showthread.php?41522-Linear-Interpolation&p=263514&viewfull=1#post263514>is
> one that also includes sorting. But I need to run this over the
> "two-dimensional" array that is the aerofoil data. Not all aerofoil AoA's
> are the same for the different Re (xfoil was used to obtain this data).
> This means that creating an array would have blanks at some AoA's, unless I
> interpolate to fill in the gaps.
>
> I was thinking that I might write a code to create an array of cl and cd
> for each Re-number at the AoA, but the AoA is not always a neat number.
> However, neither is the Reynolds number.
>
> How would you do it? Could you use an interpolation function such as the
> one I linked to (not a preference, so I'm impartial)?
>
> Thanks in advance
>
>
>
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