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Hello, I am new to Mathematica and am having a little trouble figuring out how to read a file and put the data into a variable so I can work on it. I have used In:= data=ReadList[datafile,RecordLists->True,Number] and all I get is that repeated as Out. ReadList without the assignment seems to work OK and I get a listing of the data. How does this work ? When I then try to look at data In:= data[] I get a repeat of the In line. If I do the ReadList, it creates a list, but if I then try ListPlot[%], it gives me an error. Also, is there an analogy to the rewind command. The file appears to stay open and at the end of file. I had heard there was a steep learning curve for this program, but it looks like the reward will be worthwhile. Any help would be greatly appreciated as I slog uphill ! remove 1001 to reply.