org.das2.qds.DDataSet

rank 0,1,2,3 or 4 dataset backed by double array (8 byte real numbers).

version

accumValue

Deprecated: use addValue accumValue( int i0, int i1, double value ) → void

addValue

addValue( int i0, double value ) → void

add this value to the current value.

Parameters

i0 - the index
value - the value, which is cast to this internal type.

Returns:

void (returns nothing)

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addValue( int i0, int i1, double value ) → void
addValue( int i0, int i1, int i2, double value ) → void

addValues

addValues( QDataSet ds, QDataSet wds ) → void

add all valid values of ds to this dataset. This does not reconcile rank, see CoerceUtil.

Parameters

ds - a QDataSet
wds - a QDataSet

Returns:

void (returns nothing)

See Also:

CoerceUtil#coerce(QDataSet, QDataSet, boolean, QDataSet[])


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capability

capability( java.lang.Class clazz ) → Object

TODO: this is untested, but is left in to demonstrate how the capability method should be implemented. Clients should use this instead of casting the class to the capability class.

Parameters

clazz - the class, such as WritableDataSet.class

Returns:

null or the capability if exists, such as WritableDataSet

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copyElements

copyElements( org.das2.qds.DDataSet src, int srcpos, org.das2.qds.DDataSet dest, int destpos, int nrec ) → void

copy elements of src DDataSet into dest DDataSet, with System.arraycopy. src and dst must have the same geometry, except for dim 0. Allows for aliasing when higher dimension element count matches.

Parameters

src - source dataset
srcpos - source dataset first dimension index.
dest - destination dataset
destpos - destination dataset first dimension index.
nrec - number of records to copy. Note this is different than the other copyElements!

Returns:

void (returns nothing)

See Also:

copyElements(org.das2.qds.DDataSet, int, org.das2.qds.DDataSet, int, int, boolean)


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copyElements( org.das2.qds.DDataSet src, int srcpos, org.das2.qds.DDataSet dest, int destpos, int len, boolean checkAlias ) → void

create

create( int[][] qube ) → DDataSet

Makes an array from array of dimension sizes. The result will have rank qube.length().

Parameters

qube - array specifying the rank and size of each dimension

Returns:

the array as a QDataSet

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createRank0

createRank0( ) → DDataSet

create a rank 1 dataset backed by array of doubles.

Returns:

rank 0 dataset backed by double.

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createRank1

createRank1( int len0 ) → DDataSet

create a rank 1 dataset backed by array of doubles.

Parameters

len0 - length of the dimension

Returns:

rank 1 qube dataset of backed by array of doubles.

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createRank1Bins

createRank1Bins( double min, double max, Units u ) → DDataSet

convenient method for creating DatumRanges bins datasets.

Parameters

min - the minumum value
max - the maximum value
u - the ratiometric or time location units

Returns:

the rank1 bins dataset

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createRank2

createRank2( int len0, int len1 ) → DDataSet

create a rank 2 qube dataset backed by array of doubles.

Parameters

len0 - length of the dimension
len1 - length of the dimension

Returns:

rank 2 qube dataset of backed by array of doubles.

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createRank3

createRank3( int len0, int len1, int len2 ) → DDataSet

create a rank 3 qube dataset backed by array of doubles.

Parameters

len0 - length of the dimension
len1 - length of the dimension
len2 - length of the dimension

Returns:

rank 3 qube dataset of backed by array of doubles.

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createRank4

createRank4( int len0, int len1, int len2, int len3 ) → DDataSet

create a rank 4 qube dataset backed by array of doubles.

Parameters

len0 - length of the dimension
len1 - length of the dimension
len2 - length of the dimension
len3 - length of the dimension

Returns:

rank 4 qube dataset of backed by array of doubles.

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putValue

putValue( double value ) → void

Parameters

value - a double

Returns:

void (returns nothing)

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putValue( int i0, double value ) → void
putValue( int i0, int i1, double value ) → void
putValue( int i0, int i1, int i2, double value ) → void
putValue( int i0, int i1, int i2, int i3, double value ) → void

slice

slice( int i ) → QDataSet

the slice operator is better implemented here. Presently, we use System.arraycopy to copy out the data, but this could be re-implemented along with an offset parameter so the original data can be used to back the data.

Parameters

i - the index

Returns:

a rank N-1 slice of the data.

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trim

trim( int start, int end ) → QDataSet

Parameters

start - an int
end - an int

Returns:

org.das2.qds.QDataSet

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value

value( ) → double

Returns:

double

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value( int i0 ) → double
value( int i0, int i1 ) → double
value( int i0, int i1, int i2 ) → double
value( int i0, int i1, int i2, int i3 ) → double

wrap

wrap( double[][] data, int[][] qube ) → DDataSet

Wraps an array from array of dimension sizes. The result will have rank qube.length(). For rank 0, data is 1-element array.

Parameters

data - array containing the data, with the last dimension contiguous in memory.
qube - array specifying the rank and size of each dimension

Returns:

the array as a QDataSet

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wrap( double[][] back, int rank, int len0, int len1, int len2 ) → DDataSet
wrap( double[][] back ) → DDataSet
wrap( double[][] back, int nx, int ny ) → DDataSet
wrap( double[][] back, int rank, int len0, int len1, int len2, int len3 ) → DDataSet
wrap( double[][] xx, Units xunits ) → DDataSet

wrapRank2

wrapRank2( double[][] back, int n1 ) → DDataSet

creates a DDataSet by wrapping an existing array, and aliasing it to rank2. Note the last index is packed closest in memory.

Parameters

back - a double[]
n1 - the size of the second dimension.

Returns:

an org.das2.qds.DDataSet

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wrapRank3

wrapRank3( double[][] back, int n1, int n2 ) → DDataSet

creates a DDataSet by wrapping an existing array, and aliasing it to rank2. Note the last index is packed closest in memory. The first index length is calculated from the size of the array.

Parameters

back - a double[]
n1 - the size of the second index.
n2 - the size of the third index.

Returns:

an org.das2.qds.DDataSet

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