public void AverageLinkageTest()
{
// left is null
{
ArgumentExceptionAssert.Throw(
() =>
{
Distance.AverageLinkage(
left: (DoubleMatrix)null,
right: DoubleMatrix.Identity(2));
},
expectedType: typeof(ArgumentNullException),
expectedPartialMessage: ArgumentExceptionAssert.NullPartialMessage,
expectedParameterName: "left");
}
// right is null
{
ArgumentExceptionAssert.Throw(
() =>
{
Distance.AverageLinkage(
left: DoubleMatrix.Identity(2),
right: (DoubleMatrix)null);
},
expectedType: typeof(ArgumentNullException),
expectedPartialMessage: ArgumentExceptionAssert.NullPartialMessage,
expectedParameterName: "right");
}
// right and left have not the same number of columns
{
ArgumentExceptionAssert.Throw(
() =>
{
Distance.AverageLinkage(
left: DoubleMatrix.Identity(2),
right: DoubleMatrix.Identity(3));
},
expectedType: typeof(ArgumentException),
expectedPartialMessage: string.Format(
ImplementationServices.GetResourceString(
"STR_EXCEPT_PAR_MUST_HAVE_SAME_NUM_OF_COLUMNS"),
"left"),
expectedParameterName: "right");
}
// input is valid
{
var items = IndexCollection.Range(0, 3);
int numberOfItems = items.Count;
var attributes = IrisDataSet.GetAttributesAsDoubleMatrix();
var classes = IrisDataSet.GetClasses();
var partition = IndexPartition.Create(classes);
var left = attributes[partition["virginica"], ":"][items, ":"];
var right = attributes[partition["setosa"], ":"][items, ":"];
var actual = Distance.AverageLinkage(left, right);
var expected = 4.932325;
Assert.AreEqual(expected, actual, DoubleMatrixTest.Accuracy);
}
}