I am trying to use the "cast" function from the reshape package, where the 
formula is not passed in directly, but as the result of the as.formula() 
function. 

Using reshape v. 0.7.2 

I am able to properly melt() by data with: 

> molten <- melt(x, id=1:2) 

then I can properly cast with this: 

> cast(molten, days ~ variable) 

but if I try 

> cast(molten, as.function("days ~ variable")) 

if returns the error: 

Error in check_formula(formula, varnames) : 
        Formula contains variables not in list of known variables 

I am not sure if the problem is with cast or as.formula() 

I did confirm that: 

> x <- days ~ variable 

> y <- as.formula("days ~ variable") 

> x==y 
TRUE


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