Beispiel #1
0
        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);
            }
        }