[R] field names as function parameters

tdm philb at philbrierley.com
Sun Oct 11 00:36:44 CEST 2009


I am passing a data frame and field name to a function. I've figured out how
I can create the formula based on the passed in field name, but I'm
struggling to create a vector based in that field.

for example if I hard code with the actual field name

Y = df$Target, everything works fine.

but if I use the passed in parameter name, it doesn't give me what I want,

Y = df$mytarget

Here is the function,

# trying to pass field name to a function
logistictest <- function(df,mytarget)

#library for AUC calculation

#build logistic model
mytarget <- deparse(substitute(mytarget)) 
myformula <- paste(mytarget," ~ .")
myformula <- deparse(substitute(myformula)) 
logistic_reg <- glm(myformula , data=df, family=binomial(link="logit"))
print("model build OK")

#score up
scores <- predict(logistic_reg, type="response", df)
print("model scored OK")

#calc AUC
Y = df$mytarget

auc <- colAUC(scores,Y)
print("auc calculated OK")



[1] "model build OK"
[1] "model scored OK"
Error in as.vector(x, mode) : invalid 'mode' argument

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