Match the feature set of a dfm to a specified vector of feature names.
For existing features in
x for which there is an exact match for an
features, these will be included. Any features in
features will be discarded, and any feature names specified in
features but not found in
x will be added with all zero counts.
character; the feature names to be matched in the output dfm
Selecting on another dfm's
featnames is useful when you
have trained a model on one dfm, and need to project this onto a test set
whose features must be identical. It is also used in
A dfm whose features are identical to those specified in
dfm_select, this function will add feature names
not already present in
x. It also provides only fixed,
case-sensitive matches. For more flexible feature selection, see
1 2 3 4 5 6 7 8 9 10 11
# matching a dfm to a feature vector dfm_match(dfm(""), letters[1:5]) dfm_match(data_dfm_lbgexample, c("A", "B", "Z")) dfm_match(data_dfm_lbgexample, c("B", "newfeat1", "A", "newfeat2")) # matching one dfm to another txt <- c("This is text one", "The second text", "This is text three") (dfmat1 <- dfm(txt[1:2])) (dfmat2 <- dfm(txt[2:3])) (dfmat3 <- dfm_match(dfmat1, featnames(dfmat2))) setequal(featnames(dfmat2), featnames(dfmat3))
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