cast_sparse
From tidytext v0.1.3
by Julia Silge
Create a sparse matrix from row names, column names, and values in a table.
Create a sparse matrix from row names, column names, and values in a table.
Usage
cast_sparse(data, row, column, value)Arguments
- data
A tbl
- row
A bare column name to use as row names in sparse matrix
- column
A bare column name to use as column names in sparse matrix
- value
A bare column name to use as sparse matrix values, default 1
Details
Note that cast_sparse ignores groups in a grouped tbl_df.
Value
A sparse Matrix object, with one row for each unique value in
the row column, one column for each unique value in the column
column, and with as many non-zero values as there are rows in data.
Examples
# NOT RUN {
dat <- data.frame(a = c("row1", "row1", "row2", "row2", "row2"),
b = c("col1", "col2", "col1", "col3", "col4"),
val = 1:5)
cast_sparse(dat, a, b)
cast_sparse(dat, a, b, val)
# }
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