Row Transforms¶
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f(v, row, row_n, i_s, i_d, header_s, header_d,scratch, errors, accumulator):
Yield rows for a
Root.Datafile
When the function is listed as a transform for a column, it is called for every row of data.
- Parameters
v – The current value of the column
row – A RowProxy object for the whiole row.
row_n – The current row number.
i_s – The numeric index of the source column
i_d – The numeric index for the destination column
header_s – The name of the source column
header_d – The name of the destination column
scratch – A dict that can be used for storing any values. Persists between rows.
errors – A dict used to store error messages. Persists for all columns in a row, but not between rows.
accumulator – A dict for use in accumulating values, such as computing aggregates.
- Returns
The final value to be supplied for the column.