![]() It may be displayed in matrix form, and its rows and columns extracted using matrix indexing conventions. Vector structures appearing as variables of the data frame must all have the same length, and matrix structures must all have the same row size.Ī data frame may for many purposes be regarded as a matrix with columns possibly of differing modes and attributes. Numeric vectors, logicals and factors are included as is, and by default 18 character vectors are coerced to be factors, whose levels are the unique values appearing in the vector. Matrices, lists, and data frames provide as many variables to the new data frame as they have columns, elements, or variables, respectively. The components must be vectors (numeric, character, or logical), factors, numeric matrices, lists, or other data frames. There are restrictions on lists that may be made into data frames, namely In this case all other attributes, such as dim attributes, are discarded.Ī data frame is a list with class “ame”. Recall that with vector objects as arguments the concatenation function similarly joined together all arguments into a single vector structure. New lists may be formed from existing objects by the function list(). Other structures besides lists may, of course, similarly be given a names attribute also. The vector of names is in fact simply an attribute of the list like any other and may be handled as such. x may be minimally specified as Lst\)coe and Lst \(covariance as Lst\)cov. ![]()
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