R Error In Eval Object Not Found
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here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about error in eval(expr envir enclos) object 'x1' not found Stack Overflow the company Business Learn more about hiring developers or posting ads with error in eval(expr envir enclos) object not found random forest us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is error in eval expr envir enclos object not found predict a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Error in eval(expr, envir, enclos) : object not found up vote 5 down error in eval(expr, envir, enclos) : object not found function vote favorite 6 I am very new to coding in R, and cannot understand what is going wrong here. Any help will be much appreciated. data.train <- read.table("Assign2.WineComplete.csv",sep=",",header=T) # Building decision tree Train <- data.frame(residual.sugar=data.train$residual.sugar, total.sulfur.dioxide=data.train$total.sulfur.dioxide, alcohol=data.train$alcohol, quality=data.train$quality) Pre <- as.formula("pre ~ quality") fit <- rpart(Pre, method="class",data=Train) I am getting the following error : Error in eval(expr, envir, enclos) : object 'pre' not found r share|improve this question edited Apr
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3 at 9:50 Roman Luštrik 34k1372121 asked Oct 19 '13 at 6:30 Rads 73118 1 You don't need the second or third lines of your code. Just do the read.table line then do: fit <- rpart(pre ~ quality, method="class",data=data.train). –Thomas Oct 19 '13 at 6:45 I tried what you asked me to do, but I still get the same error –Rads Oct 19 '13 at 7:12 Is there a upper/lower case problem here? I see 'Pre' declared but error is about 'pre'. –ako Oct 19 '13 at 7:31 No, if instead of all the statements, i just write data.train <- read.table("Assign2.WineComplete.csv",sep=",",header=T) and then fit <- rpart(pre ~ quality, method="class",data=data.train) , i get the same error –Rads Oct 19 '13 at 7:36 add a comment| 3 Answers 3 active oldest votes up vote 10 down vote accepted Don't know why @Janos deleted his answer, but it's correct: your data frame Train doesn't have a column named pre. When you pass a formula and a data frame to a model-fitting function, the names in the formula have to refer to columns in the data frame. Your Train has columns called residual.sugar, total.sulfur, alcohol and quality. You need to change either your formula
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"error In Eval(expr, Envir, Enclos) : Object 'group' Not Found"
Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs object not found r error Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, error in eval expr envir enclos y values must be 0 y 1 just like you, helping each other. Join them; it only takes a minute: Sign up Error in eval(expr, envir, enclos) : object 'Param1' not found up vote 0 down vote favorite I read train_data from csv and http://stackoverflow.com/questions/19463137/error-in-evalexpr-envir-enclos-object-not-found then train GBM model as follows: train_rows <- sample(nrow(train_data), round(nrow(train_data) * 0.5)) traindf <- data[train_rows, ] testdf <- data[-train_rows, ] gbm_formula <- as.formula("traindf$myTarget ~ Param1 + Param2 + Param3") gbm_model <- gbm(gbm_formula, traindf, distribution = "bernoulli", n.trees = 200, bag.fraction = 0.75, cv.folds = 5, interaction.depth = 3) Then I get the following error appears: Error in eval(expr, envir, enclos) : object 'Param1' not found The only solution that I know is to specify http://stackoverflow.com/questions/29042733/error-in-evalexpr-envir-enclos-object-param1-not-found gbm_formula as follows: gbm_formula <- as.formula("traindf$myTarget ~ traindf$Param1 + traindf$Param2 + traindf$Param3") Is there another solution to fix this? r share|improve this question asked Mar 13 '15 at 22:02 Klausos Klausos 3,3352062109 Does it work if you change your formula to: gbm_formula <- as.formula("myTarget ~ Param1 + Param2 + Param3") –eipi10 Mar 13 '15 at 22:09 @eipi10: No,then it says "Error in eval(expr, envir, enclos) : object 'myTarget' not found". I really don't get the point, because all the tutorials that I've seen use this formula. But it does not run for my data. I double-checked that the column names are correct. –Klausos Klausos Mar 13 '15 at 22:13 Try changing traindf to data=traindf in your call to gbm. I think you need to name the argument, since the second-position argument in the function is actually distribution. –eipi10 Mar 13 '15 at 22:16 @eipi10: Now it says again about the Param1 –Klausos Klausos Mar 13 '15 at 22:22 2 Well, now I'm stumped. Can you post a small sample of your data frame along with the output of str(traindf)? –eipi10 Mar 13 '15 at 22:24 | show 2 more comments 2 Answers 2 active oldest votes up vote 1 down vote accepted Change traindf to data=traindf in your call to gbm. Yo