Description Usage Arguments Details Value Examples

View source: R/sparse_casters.R

This function supports non-standard evaluation through the tidyeval framework.

1 | ```
cast_sparse(data, row, column, value, ...)
``` |

`data` |
A tbl |

`row` |
Column name to use as row names in sparse matrix, as string or symbol |

`column` |
Column name to use as column names in sparse matrix, as string or symbol |

`value` |
Column name to use as sparse matrix values (default 1) as string or symbol |

`...` |
Extra arguments to pass on to |

Note that cast_sparse ignores groups in a grouped tbl_df. The arguments
`row`

, `column`

, and `value`

are passed by expression and support
quasiquotation; you can unquote strings and symbols.

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`

.

1 2 3 4 5 6 7 | ```
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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