row - Subtracting Columns in R -

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i have 2 columns trying subtract , put new one, 1 of them contains values read '#null!', after converting on spss , excel, r reads factor , not let me subtract. easiest way fix knowing have 19,000+ rows of data?

while reading dataset using read.table/read.csv, can specify na.strings argument values needs transformed 'na' or missing values. so, in dataset be

dat <- read.table('yourfile.txt', na.strings=c("#null!", "-99999", "-88888"),       header=true, stringsasfactors=false)

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