dataFrame.rows — chunksOptimal()

The chunksOptimal() method of the rows object returns an array assigning each row to an automatically calculated chunk. Chunk sizes are distributed as evenly as possible while remaining between the specified minimum and maximum sizes.

dataFrame.rows.chunksOptimal(sizeMin, sizeMax)

Scope

dataFrame

Family

rows

Returns

array

sizeMin (number)

The minimum number of rows per chunk.

sizeMax (number)

The maximum number of rows per chunk.

mask ( number[] )

An array containing the optimal chunk index assigned to each row.

// get the chunks for a given dataFrame, with a size between 10 and 20
var mask = df.rows.chunksOptimal(10, 20);

// set a new column with the chunks indexes
dataFrame.column('chunk').set(mask);