Tuple¶
- public final class Tuple¶
An immutable tuple. All methods of this class throw a
NullPointerException
if a null object reference is passed in any parameter.
Fields¶
_impl¶
- TupleBase _impl¶
Constructors¶
Tuple¶
Tuple¶
- public Tuple(int[] elements)¶
Tuple¶
- public Tuple(double[] elements)¶
Tuple¶
Methods¶
elements¶
equals¶
factory¶
get¶
hashCode¶
- public int hashCode()¶
Hash code of all elements
join¶
- public static Tuple join(Object... elements)¶
Constructs a new
Tuple
joining the specified elements.The elements in a Tuple can be numbers, strings, tuples or arrays.
Use this function to construct a tuple for accessing instances of AMPL entities indexed over 2 or more index sets at least one of which is two-dimensional.
For example, accessing the AMPL entity:
var x{{(1,2)}, {'a'}};
can be achieved either via:
Variable x = ampl.getVariable("x"); x.get(1, 2, "a");
or, using this function, as:
Variable x = ampl.getVariable("x"); Tuple t = new Tuple(1, 2); x.get(Tuple.join(t, "a"));
The very same way, the elements of the tuple created by:
t = Tuple.join(new Object[] { 2, 3 }, 4, "b";);
will be equivalent to
t = new Tuple(2, 3, 4, "b").
or, by joining tuples:
Tuple A = new Tuple(2, 3); Tuple B = Tuple.join(A, A);
is equivalent to:
Tuple B = new Tuple(2, 3, 2, 3);
Note that to conform with the AMPL type system all basic Java numeric types are converted to double, as AMPL supports only one numeric type (see
Tuple.Tuple
for more information).
size¶
- public int size()¶
Returns the number of elements in this tuple.