because you are comparing factors and not strings. From? factor: Only and! can be used for factors: a factor can only be compared to another factor with an identical set of levels (not necessarily in the same ordering) or to a character vector. r project level sets of factors are different Re: Error: level sets of factors are different? The cbind method to data. frame is just a wrapper for data. frame(). So character columns are converted to factors.
Levels Attributes Description. levels provides access to the levels attribute of a variable. The first form returns the value of the levels of its argument and the second sets the attribute. Usage levels(x) levels(x) value Note that for a factor, replacing the levels via levels(x) value is not the same as (and is preferred to) attr r project level sets of factors are different
All the comparison operators are available for ordered factors. Collation is done by the levels of the operands: if both operands are ordered factors they must have the same level set. Note. In earlier versions of R, storing character data as a factor was more space efficient if there is even a small proportion of repeats. However, identical Ignore the order of factor levels. ignoreDimOrder Ignore the order of dimensions when comparing matrices, arrays, or tables. different sets of comparison objects (where each set of comparison objects is generated from a ( example , model. R , package compare )) compareIdentical Compare Two Objects for Identity Factors in R are stored as a vector of integer values with a corresponding set of character values to use when the factor is displayed. The f actor function is used to create a factor. The only required argument to factor is a vector of values which will be returned as a vector of factor values. r project level sets of factors are different Learning Objectives. While factors look (and often behave) like character vectors, they are actually integers under the hood, and you need to be careful when treating them like strings. Once created, factors can only contain a predefined set values, known as levels. By default, R always sorts levels in alphabetical order. Re: [R level sets of factors are different. This is bit strange. dataframea[1: 1 is dataframea[1 and is a singlecolumn dataframe. I think you might just as well use filtera dataframea[[1 which is (probably) a factor. I suspect in the creation of your data, you inadvertently and implicitly converted your columns to factors. This possibly happened when you read the data from source, e. g. when using read. csv or read. table. The message is really explicit. You are trying to compare the equality of two factors with different level sets. Such factors are not comparable (and this is discussed on? factor).