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Can a workflow gather user input row-by-row while processing a dataset? If so, how?
Yes, you can use various GUI packages in R to display dialogs and gather user input. Among other packages, the gWidgets2 and RGtk2 packages work together nicely to provide the ginput function, which can - all by itself - suffice for displaying the field's original value, and gathering a replacement value. See the attached v10.5 workflow for a very simple example.