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Extracts a subset of lines from the model.
# S3 method for bi_model [(x, i, ...)
a character string of the extracted model lines(s)
A bi_model
A vector of line numbers
ignored
model_file_name <- system.file(package = "rbi", "PZ.bi") PZ <- bi_model(filename = model_file_name) PZ[3:4]
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