On 2010-12-06 01:58, Sunny Srivastava wrote:
Dear R-Helpers:I am using trying to use *ddply* to extract min and max of a particular column in a data.frame. I am using two different forms of the function: ## var_name_to_split is a string -- something like "var1" which is the name of a column in data.frame ddply( df, .(as.name(var_name_to_split)), function(x) c(min(x[ , 3] , max(x[ , 3]))) ## fails with an error - case 1 ddply( df, var_name_to_split , function(x) c(min(x[ , 3] , max(x[ , 3]))) ## works fine - case 2
Try it without the .(), i.e. ddply(df, as.name(), ....) Peter Ehlers
I can't understand why I get the error in case 1. Can someone help me please? Thank you in advance. S.
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