added further toy example for line fit with OLS

Author: fs446

index.ipynb

@@ -45,6 +45,9 @@
     "- [SVD and Left Inverse](exercise04_leftinv.ipynb)\n",
     "- [SVD and Left Inverse, Example for WS25/26](left_inverse.ipynb)\n",
     "- [SVD and Right Inverse, Example for WS25/26](right_inverse.ipynb)\n",
+    "- [Line Fit with Linear Regression](line_fit_linear_regression.ipynb)\n",
+    "- [Line Fit with Linear Regression, Example for WS25/26](line_fit_linear_regression2.ipynb)\n",
+    "- [Linear Regression with OLS](ols.ipynb)\n",
     "\n",
     "## Exercise: SVD Factorization for Multitrack Audio Matrix\n",
     "- [exercise05.ipynb](exercise05.ipynb)\n",
@@ -54,6 +57,7 @@
     "- [exercise08_ridge_regression.ipynb](exercise08_ridge_regression.ipynb)\n",
     "- [exercise07_left_inverse_SVD_QR.ipynb](exercise07_left_inverse_SVD_QR.ipynb)\n",
     "\n",
+    "\n",
     "## Exercise: Audio Features\n",
     "- [Audio Features I](exercise02.ipynb) (Segmentation, STFT, Spectrogram, Periodogram)\n",
     "- [Audio Features II](exercise03.ipynb) (Segmentation, RMS/(True)Peak/Crest Factor, R128 loudness)\n",
@@ -135,8 +139,6 @@
     "- [SVD and Right Inverse](exercise04_rightinv.ipynb)\n",
     "- [QR factorization.ipynb](exercise07_QR.ipynb)\n",
     "- [SVD and 4 Subspaces, above example as Matlab script](svd_four_subspaces.m)\n",
-    "- [Line Fit with Linear Regression](line_fit_linear_regression.ipynb)\n",
-    "- [Linear Regression with OLS](ols.ipynb)\n",
     "- [linear_regression LS_vs_SVD](exercise07_linear_regression_LS_vs_SVD.ipynb)\n",
     "- [pca_3D.ipynb](pca_3D.ipynb)\n",
     "- [pca_of_exam_grades.ipynb](pca_of_exam_grades.ipynb)\n",