Some of this is demonstrated in the couple of screenshots below. Then go to the top of the file and copy the code (CNTL, V). To apply the linear interpolation, you can use the same process with a function named interpolatelookuplinear. This results in larger changes in the early part of the interpolation and lower changes later on. Using the interpolatelookup function with the growth method for interpolation is illustrated in the screen shot below (the difference between the growth method and the linear method is explained below. Instead, you can press SHIFT and F3 to show the required arguments. The only difference is that the arguments for the function are not shown automatically with a user defined function. Then you copy the entire contents of what is in the Lookupfunctions VBA module to a module in your workbook.Īn illustration of pressing the ALT and F8 key is shown below.Īfter this you edit the module then press ALT A to select everything then ALT C to copy everything then go to your workbook and either enter a new module or go to the top of an exiting one then press CNTL V to paste everything. Once you open the file you have to copy the UDF function from this sheet to your sheet. The first interpolate function uses a compound growth method. There are in fact two versions of the function that allow you to interpolate in different ways. On this page I walk through how to use and create an interpolate function after discussing the dynamic goal seek function method.
When using the LOOKUP function it almost seems obvious that there should be an interpolate option so values in the intermediate periods are filled in. You typically lookup on a date, then click on an entire row or columns of dates that correspond to you input.Įntire row or column of values that correspond to the dates. To understand the interpolate function, you should first know that the LOOKUP function is better than VLOOKUP, HLOOKUP or MATCH and INDEX. You can use the interpolate function with either compound growth interpolation or with straight line interpolation. The interpolate UDF works very much like the lookup function but it allows you to have numbers that gradually increase or decrease rather than moving in steps.
You can search the internet and find a couple of interpolate user defined functions (and pay), or you can use the interpolate function that is available for download below at no charge.
When you have entered the blank lines you will press the CNTL, V and copy the code to the top of the page. Interpolate In Excel For Mac By eltimaxy1984 Follow | Public
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