org.das2.qds.SubsetDataSet
Extracts a subset of the source dataset by using a rank 1 subset of indeces on each index.
SubsetDataSet( QDataSet source )
create a subSetDataSet for the source, which is read for applyIndex calls
which reduce each index.
applyIndex
applyIndex( int idim, QDataSet idx ) → void
apply the subset indexes to a given dimension. For example,
if a=[10,20,30,40] then applyIndex( 0, [1,2] ) would result in [20,30].
Parameters
idim - an int
idx - the rank 1 index list, for example from where on a rank 1 dataset.
Returns:
void (returns nothing)
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length
length( ) → int
Returns:
int
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length( int i ) → int [view source]
length( int i, int j ) → int [view source]
length( int i, int j, int k ) → int [view source]
parseIndices
parseIndices( String spec, int dimlen ) → int[]
parse the string spec into a list of indices. The spec is a
comma-delineated list containing any combination of:
- index, with negative indices relative to the end.
- start:stop, with stop exclusive.
- start:stop:stride, incrementing stride elements, including negative.
- start-stopInclusive, where the trailing index is also included.
If the spec starts with ~, then these indices are removed. For example:
- ~5, remove the 5th index.
- ~15:20, remove the 5 indices starting at 15.
- ~-1, remove the last index.
Note if invert is present, then the indices cannot be reversed.
Parameters
spec - a String
dimlen - an int
Returns:
the list of integers.
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property
property( String name, int i ) → Object
Parameters
name - a String
i - an int
Returns:
java.lang.Object
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property( String name ) → Object [view source]
rank
rank( ) → int
Returns:
int
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value
value( ) → double
Returns:
double
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value( int i ) → double [view source]
value( int i0, int i1 ) → double [view source]
value( int i0, int i1, int i2 ) → double [view source]
value( int i0, int i1, int i2, int i3 ) → double [view source]