[R] Warning from reshape2 when melting a data frame with uneven number of columns.

John Kane jrkrideau at yahoo.ca
Sun Jun 4 16:44:42 CEST 2017

I am not really sure what the warning means but I think your underlying problem is that all your variables are factors. Did you intend the values in each variable to be character?
data.frame':    3 obs. of  5 variables:
 $ V1: Factor w/ 3 levels "Name1","Name2",..: 1 2 3
 $ V2: Factor w/ 3 levels "nam1","name-1",..: 1 3 2
 $ V3: Factor w/ 3 levels "nam2","nam_34",..: 1 2 3
 $ V4: Factor w/ 3 levels "","nam3","nam_56": 2 3 1
 $ V5: Factor w/ 2 levels "","name_78": 1 2 1


    On Sunday, June 4, 2017 6:48 AM, Ashim Kapoor <ashimkapoor at gmail.com> wrote:

 Here is a small reproducible example:

data <-
structure(list(V1 = structure(1:3, .Label = c("Name1", "Name2",
"Name3"), class = "factor"), V2 = structure(c(1L, 3L, 2L), .Label =
"name-1", "name_12"), class = "factor"), V3 = structure(1:3, .Label =
"nam_34", "name-2"), class = "factor"), V4 = structure(c(2L,
3L, 1L), .Label = c("", "nam3", "nam_56"), class = "factor"),
    V5 = structure(c(1L, 2L, 1L), .Label = c("", "name_78"), class =
"factor")), .Names = c("V1",
"V2", "V3", "V4", "V5"), class = "data.frame", row.names = c(NA,

data_long <- melt(data,id.vars="V1")

Warning message:
attributes are not identical across measure variables; they will be dropped

Can someone please tell me how to correct this?

Best Regards,

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