Why is this R function throwing error -


i'm trying make simple wrapper function in r. throws , error , don't understand why. 

set.seed(98) d1 <- data.frame(           y = factor(rep(c("a","b","c","d"),25)),            = rnorm(100),            b = rnorm(100) )   mlog_reg_p = function(f, d, ...) {      if(!(require("nnet"))) {         stop("package 'nnet' not installed. install.packages('nnet')")     }      syx = match.call()     su = summary(multinom(formula = f, data = d))     z = su$coefficients / su$standard.errors      p = (1 - pnorm(abs(z), 0, 1)) * 2      list(         syntax = syx,         model_summary = su,         p_values = p     ) }

and when trying run it: 

mlog_reg_p(y ~ + b, d1)

it throws error:

error in stats::model.frame(formula = f, data = d): object 'f' not found

what messing up?


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