df <- data.frame(A=c(1,2), B=c(1,1))

I have a string containing a condition for a subset function, like:
conditionAsString <- paste(names(df), df[1,], sep="==", collapse=" & ")
 > conditionAsString
 > "A==1 & B==1"

Now I want to use this string in the subset call, like

subset(df, conditionAsString)

I do not exactly now how to combine substitute, expression, parse and  
so on to get what I want, which would be:

subset(df, A==1 & B==1)

but using the string conditionAsString.

Thanks,
Mark
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Mark Heckmann
Blog: www.markheckmann.de
R-Blog: http://ryouready.wordpress.com





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