Merge remote-tracking branch 'upstream/master'

1 files changed, 46 insertions, 0 deletions

diff --git a/challenge-211/roger-bell-west/lua/ch-1.lua b/challenge-211/roger-bell-west/lua/ch-1.lua
new file mode 100755
index 0000000000..50dfb58b1c
--- /dev/null
+++ b/challenge-211/roger-bell-west/lua/ch-1.lua
@@ -0,0 +1,46 @@
+#! /usr/bin/lua
+
+function toeplitzmatrix(a)
+   local ym = #a - 1
+   local xm = #(a[1]) - 1
+   local toeplitz = true
+   for xb = (1 - xm), (ym - 1) do
+      local init = true
+      local tv = 0
+      for xi = xb, xb + xm do
+         if xi >= 0 and xi <= xm then
+            local x = xi + 1
+            local yi = xi - xb
+            if yi >= 0 and yi <= ym then
+               local y = yi + 1
+               if init then
+                  init = false
+                  tv = a[y][x]
+               elseif a[y][x] ~= tv then
+                  toeplitz = false
+                  break
+               end
+            end
+         end
+      end
+      if not toeplitz then
+         break
+      end
+   end
+   return toeplitz
+end
+
+if toeplitzmatrix({{4, 3, 2, 1}, {5, 4, 3, 2}, {6, 5, 4, 3}}) then
+  io.write("Pass")
+else
+  io.write("FAIL")
+end
+io.write(" ")
+
+if not toeplitzmatrix({{1, 2, 3}, {3, 2, 1}}) then
+  io.write("Pass")
+else
+  io.write("FAIL")
+end
+print("")
+