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in reply to How to use a formula in perl

Although I'm not entirely sure what you are trying to accomplish, as olus mentioned, you might want to use Spreadsheet::ParseExcel to read the files. However, you should look into Spreadsheet::WriteExcel if you want to generate an Excel formula and write out the Excel binary file format. However, please note that this module does not store results with the formula (in other words, it behaves as if autocalculate is off).