if_not_found is the value to return if nothing is found (optional).return_array is the array from which a result is returned.lookup_array is the array where the lookup_value is searched for.=XLOOKUP(lookup_value, lookup_array, return_array,, , ) Use XLOOKUP to Find Values to Interpolate in Excel To estimate the density at 53 degrees Celsius, use XLOOKUP to find the values x1=40, y1=1.127, x2=60, and y2=1.067 in the table, then feed those values into the FORECAST function to perform the interpolation. To get data at any temperature between 0 and 100 C, we’ll have to interpolate. The table below lists air density as a function of temperature in 20-degree Celsius increments. Let’s look at how to interpolate in Excel on some real data. But what if you need to interpolate missing data in Excel for better accuracy? Well, it’s also possible to perform linear interpolation in Excel, which enables you to estimate a y-value for any x-value that is not provided explicitly in the data. In some other posts on looking up tabular data in Excel, I’ve focused on how to extract known x- and y-values from a table. If you are on an older version of Excel, use the INDEX/MATCH method described below. If you are a Microsoft 365 subscriber, or are using Excel 2021, Excel for the web, or Excel for iOS or Android devices, you can use the XLOOKUP function to extract the values. However, if you need even greater accuracy, you may want to consider a more advanced method such as cubic splines. In most cases linear interpolation in Excel will provide results that are sufficiently accurate. Linear interpolation assumes that the change in y for a given change in x is linear. To interpolate between x- and y-values in a large data set (more than 2 pairs of values), use either XLOOKUP or INDEX and MATCH to extract a pair of x- and y-values to interpolate between. However, when the number of x-values and y-values is greater than 2, the result of the FORECAST function will NOT be an interpolated y-value. When there are only two data points, the result of linear regression is the same as linear interpolation. The FORECAST function works by using linear regression to estimate the value of y that corresponds to the input value x. There isn’t a linear interpolation function in Excel, but the FORECAST function can be used for linear interpolation when there are just two pairs of x- and y-values. If there are more than 2 pairs, the calculation is more complex. This simple method works when there are only two pairs of x- and y-values. In the example below, the formula to interpolate and find the y-value that corresponds to an x-value of 1.4 is: To perform linear interpolation in Excel, use the FORECAST function to interpolate between two pairs of x- and y-values directly.
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