I've created a simple module in excel 2007: Function Sigmoid(t) Sigmoid=1/(1+exp(-t)) End Function The sigmoid function seems to work in formulas initially, but when file is saved, closed, then reopened, the formula's don't seem to work -- I get 'NAME' error in cell with formula indicating unrecognized function. I've tried saving file as .xlsx and seperately as .xlsm and get same problem either way. There must be problem with the way I am storing the module?? Any help would be appreciated. Thanks!
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