updates 10/9

1 files changed, 22 insertions, 0 deletions

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