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Hi there, I can get the for-loop to work, I can get the while loop to work. But I can't get a for loop to work nested within the while loop - why? Please help, Teresa -------------- next part -------------- An embedded and charset-unspecified text was scrubbed... Name: nested_loop_question.txt Url: https://stat.ethz.ch/pipermail/r-help/attachments/20060104/7efc5039/nested_loop_question.txt