further updates

doc/LectureNotes/_build/jupyter_execute/linalg.ipynb

@@ -225,8 +225,8 @@
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-      " -0.04110474  0.70857635 -1.39855569 -0.11081083]\n"
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@@ -662,26 +662,36 @@
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@@ -800,13 +810,13 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "0.030645975175292262\n",
-      "4.057913350391706\n",
-      "0.6380763200092493\n",
-      "[[ 0.87584434  2.75131415  3.30124108]\n",
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-      " [ 3.30124108 10.78758569 24.86174943]]\n",
-      "[31.05888195  0.08758013  4.33107417]\n"
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+      "[31.70587399  0.09156055  2.92512799]\n"
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