[R] Vertical subtraction in dataframes

nowfocus averyhaviv at hotmail.com
Sat Mar 13 02:18:20 CET 2010

It depends how you stored your missing values.  If they are listed as NAs

mydataframe$calib <- Count - is.na(stain)*Count
mydataframe$calib <- Count*(1 - is.na(stain))

The trick is the boolean 'TRUE' equals 1 in numeric calculations.
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