From adda6869cb2a07984b48c39fcd70ee76449c353d Mon Sep 17 00:00:00 2001
From: Elizabeth Hunt <elizabeth.hunt@simponic.xyz>
Date: Mon, 9 Oct 2023 21:08:25 -0600
Subject: updates 10/9

---
 notes/Oct-4.org | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
 create mode 100644 notes/Oct-4.org

(limited to 'notes/Oct-4.org')

diff --git a/notes/Oct-4.org b/notes/Oct-4.org
new file mode 100644
index 0000000..8b8466f
--- /dev/null
+++ b/notes/Oct-4.org
@@ -0,0 +1,22 @@
+[[ a_{11} a_{12} \cdots a_{1n} | b_1]
+ [ 0  (a_{22} - \frac{a_{}_{21}}{a_{22}}a_{11}) \cdots a_{2n} | b_2 - \frac{a_{21}}{a_{11}}b_1 ]]
+
+#+BEGIN_SRC c
+  for (int i = 1; i < n; i++) {
+    float factor = -a[i][0] / a[0][0];
+    for (int j = 1; j < n; j++) {
+      a[i][j] = a[i][j] + factor * a[0][j];
+    }
+    b[i] = b[i] + factor * b[0];
+  }
+
+  for (int k = 0; k < (n - 1); k++) {
+    for (int i = k+1; i < n; i++) {
+      float factor = -a[i][k] / a[k][k];
+      for (int j = k+1; j < n; j++) {
+        a[i][j] = a[i][j] + factor * a[j][k];
+      }
+      b[i] = b[i] + factor*b[k];
+    }
+  }
+#+END_SRC
-- 
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