Program.cs

using System;
using System.Linq;
using OxyPlot;
using OxyPlot.Axes;
using OxyPlot.Core.Drawing;
using OxyPlot.Series;

namespace ml {
	class Program {
		static void Main(string[] args) {
			//ml_func_tests.test_matrix_norm();
			exercise4.test_nn();
			//exercise4.test_debug_nn();
			//exercise4.test_flatten_unflatten();
			//ml_func_tests.run_all_tests();
			// var outputToFile = "./images/ex1.png";

			// var width = 1024;
			// var height = 768;
			// var background = OxyColors.LightGray;
			// var resolution = 96d;

			// var model = exercise1.plot_data1();

			// // export to file using static methods
			// PngExporter.Export(model, outputToFile, width, height, background, resolution);
		}

		private static void test_transpose() {
			var matrix = ml_funcs.matrix_create(10, 20, 0);
			var trasponse_matrix = ml_funcs.matrix_transpose(matrix);
		}

		private static IPlotModel build_scatter() {
			var model = new PlotModel { Title = "ScatterSeries" };
			var scatterSeries = new ScatterSeries { MarkerType = MarkerType.Cross };
			var r = new Random(314);
			for (int i = 0; i < 100; i++)
			{
				var x = r.NextDouble();
				var y = r.NextDouble();
				var size = 5;
				var colorValue = r.Next(0, 10);
				scatterSeries.Points.Add(new ScatterPoint(x, y, size, 5));
			}

			model.Series.Add(scatterSeries);
			model.Axes.Add(new LinearColorAxis { Position = AxisPosition.Right, Palette = OxyPalettes.Hue(10) });
			model.Axes.Add(new LinearAxis { Position = AxisPosition.Bottom, Minimum = -20, Maximum = 80});
			model.Axes.Add(new LinearAxis { Position = AxisPosition.Left, Minimum = -10, Maximum = 10});

			return model;
		}

		private static IPlotModel BuildPlotModel() {
			var rand = new Random(21);

			var model = new PlotModel { Title = "Cake Type Popularity" };

			var cakePopularity = Enumerable.Range(1, 5).Select(i => rand.NextDouble()).ToArray();
			var sum = cakePopularity.Sum();
			var barItems = cakePopularity.Select(cp => RandomBarItem(cp, sum)).ToArray();
			var barSeries = new BarSeries
			{
				ItemsSource = barItems,
				LabelPlacement = LabelPlacement.Base,
				LabelFormatString = "{0:.00}%"
			};

			model.Series.Add(barSeries);

			model.Axes.Add(new CategoryAxis
			{
				Position = AxisPosition.Left,
				Key = "CakeAxis",
				ItemsSource = new[]
				{
					"Apple cake",
					"Baumkuchen",
					"Bundt Cake",
					"Chocolate cake",
					"Carrot cake"
				}
			});
			return model;
		}

		private static BarItem RandomBarItem(double cp, double sum)
		   => new BarItem { Value = cp / sum * 100, Color = RandomColor() };

		private static OxyColor RandomColor()
		{
			var r = new Random();
			return OxyColor.FromRgb((byte)r.Next(255), (byte)r.Next(255), (byte)r.Next(255));
		}
	}

}