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#' @importFrom stats as.formula
processInput_formula = function(formula, data){
#reformulate formula to a complete form
if((sum(charToRaw(deparse(formula, width.cutoff = 500L)) == charToRaw('$')) == 0) && (is.null(data))){
formula = as.formula(paste("Surv(data$", all.vars(formula)[1],",data$", all.vars(formula)[2], ")~data$", all.vars(formula)[3], sep = ""))
}
return(formula)
}
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