how to change a dataframe with characters to a numeric matrix?

Thu, Dec 8, 2005 1:51 AM

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zhihua li how to change a dataframe with characters to a numeric matrix? Dec 8 David Hajage how to change a dataframe with characters to a numeric matrix? Dec 8 David Hajage how to change a dataframe with characters to a numeric matrix? Dec 8 Jacques VESLOT how to change a dataframe with characters to a numeric matrix? Dec 8