Some aspects work with data frames containing matrices, but not all.Ĭurrently long vectors are not accepted for inputs, which are thus This is intended to work with data frames with vector-like columns: Row.names is added at the left, and in all cases the result has Matching involved row names, an extra character column called Remaining columns in x and then those in y. The columns are the common columns followed by the The rows are by default lexicographically sorted on theĬommon columns, but for sort = FALSE are in an unspecified order. NULL records, equivalent to incomparables = NA in R.Ī data frame. Join, all.y = TRUE a right (outer) join, and both Specifying all.x = TRUE gives a left (outer) Gives a natural join, a special case of an inner In SQL database terminology, the default value of all = FALSE The complexity of the algorithm used is proportional to the length of
Well, avoiding duplicate column names in the result. No.dups is true (as by default), the y version gets suffixed as If a by.x column name matches one of y, and if This is not possible, an error is thrown. Names, these have suffixes ( ".x" and ".y" byĭefault) appended to try to make the names of the result unique. If the columns in the data frames not used in merging have any common If all.x is true, all the non matching cases of x areĪppended to the result as well, with NA filled in theĬorresponding columns of y analogously for all.y. Length zero vector or NULL), the result, r, is theĭim(r) = c(nrow(x)*nrow(y), ncol(x) + ncol(y)). If by or both by.x and by.y are of length 0 (a If specified by name it must correspond uniquely to a Vector: the name "row.names" or the number 0 specifies For the precise meaning of ‘match’, seeĬolumns to merge on can be specified by name, number or by a logical There is more than one match, all possible matches contribute one rowĮach. Match on the specified columns are extracted, and joined together.
Merge is a generic function whose principal method is for dataįrames: the default method coerces its arguments to data frames andīy default the data frames are merged on the columns with names theyīoth have, but separate specifications of the columns can be given byīy.x and by.y. This is intended to be used for merging on oneĬolumn, so these are incomparable values of that column.Īrguments to be passed to or from methods.
Was implicitly false before R version 3.5.0. More cases to avoid duplicated column names in the result. Logical indicating that suffixes are appended in Which are not used for merging (appearing in by etc). To be used for making unique the names of columns in the result Should the result be sorted on the byĪ character vector of length 2 specifying the suffixes The default isįALSE, so that only rows with data from both x and These rows will have NAs in those columns that are The output, one for each row in x that has no matching row in Logical if TRUE, then extra rows will be added to Logical all = L is shorthand for all.x = L and Specifications of the columns used for merging. )ĭata frames, or objects to be coerced to one. ) # S3 method for class 'ame' merge ( x, y, by = intersect ( names ( x ), names ( y )), by.x = by, by.y = by, all = FALSE, all.x = all, all.y = all, sort = TRUE, suffixes = c ( ".x", ".y" ), no.dups = TRUE, incomparables = NULL.
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