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faraoosiris asked on

Inverse bilinear interpolation Excel

With the help of you experts I solved my last question 29175699 on Bilinear interpolation on missing zvalues excel.

Pure reasoning makes me think it would be possible to take an other element out of the equation.
Would it be possible to get the y value through the input of a z value and x value.

My mathematical skills are near to none. How to go about to make this work. Any suggestion to get me started are welcome.
Math / ScienceMicrosoft Excel

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8/22/2022 - Mon
Ejgil Hedegaard

See sheet column Q.

Thanks again for you help.

I will look into your suggestion.

In the meantime I figured an inverse would be easier with the help of a module.
With the help of internet I came up with the solution in cell P8 in the attached file.

Would it be also be possible to inverse the module?
Ejgil Hedegaard

As you see in the file it can be calculated, so a VBA function would be able to do the same.
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William Peck

At a second glance of my question I missed out a detail.

My goal is to input the zvalue and xvalue, and return the  yvalue.

This is because the previous table is the first of three consecutive  tables that are all related to each other. The output of the first is the input for the second and so on.

Now I want to subtract the outcome of the third from the first and do the inverse interpolation on the second table to finf the yvalue.

Would it be possible to adjust your suggestion to the input of the zvalue and xvalue to return the y value?

Ejgil Hedegaard

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Thank you again for going the extra mile and to adjust and create the VBA function.

I 'am no going to try to put all the tables together and make it work the way I envision.