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parse numbers output not numerical
I am reading a .csv file that has some numbers formatted as currency, eg $1,000 or $500. These are read by RapidMiner as polynominal. So I am using the Replace operator to remove the $ and , characters. The $ removal works fine and the , removal is also fine, but oddly for sums of $999 and below, which did not have a comma in them, I receive an error message: "No Number: according to the specified format, 500 cannot be parsed as a number". There are no spaces or other nuisances. Any ideas what could cause this? Thanks...