org.das2.qds.ops.CoerceUtil

Utility class for reconciling the geometries of two datasets. For example, a rank 1 dataset's values can be repeated to make it rank 2. TODO: dataset geometry is increased by keeping a reference to a dataset with the target geometry. This might result in keeping data in memory that would otherwise be released, so a future implementation of this should probably use a non-qube dataset to store each index's length:

 public int length() {
    return lengths.length()
 }
 public int length(int i0) {
    return lengths.value(i0);
 }

CoerceUtil( )

coerce

increase rank of datasets so that element-wise operations can be performed. For example, if a rank 1 and a rank 2 dataset are to be combined and both have equal dim 0 length, then the rank 1 is promoted to rank 2 by repeating its values. This implements the rule that dimensions in QDataSet have nested context. The second dimension elements are to be understood in the context of the first dimension element. (Except for qubes, where the order is arbitrary.)

Parameters

Returns:

equalGeom

returns true if two datasets have the same number of elements in each dimension.

Parameters

Returns:

increaseRank0

increase the rank of a rank zero dataset by adding join dimensions that repeat the lower rank elements.

Parameters

Returns:

increaseRank1

increase the rank of a rank one dataset by adding join dimensions that repeat the lower rank elements.

Parameters

Returns:

increaseRank2

increase the rank of a rank two dataset by adding join dimensions that repeat the lower rank elements.

Parameters

Returns: