How to Create a Fourier Series in Excel with DownloadGT
First, download and install DownloadGT.
Click on the DownloadGT item in the Microsoft Excel Ribbon.
Using your mouse, select a column of numbers in Excel.
Click on the "Fourier Series" button in the DownloadGT Ribbon.
DownloadGT will create a new sheet containing your original Data, and an approximation of the data using
If you enter a number in the "X Value" cell (cell "D5"), the spreadsheet will calculate the "Y Value" based on
the Fourier Series Formula.
The topmost graph shows your original data plotted against the Fourier Approximation of your data.
The second graph shows a plot of the amplitudes of the Fourier Series. Large amplititudes in the graph
indicate strong periodic cycles in your data.