Pascal's triangle/Puzzle: Difference between revisions

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 =={{header|Ruby}}==
-<lang ruby># uses [[Reduced row echelon form#Ruby]]
+uses [[Reduced row echelon form#Ruby]]
-require 'rref'
+<lang ruby>require 'rref'
 pyramid = [
@@ Line 633: / Line 633: @@
 for eqn in reduced
-  if    eqn[0] == 1 and eqn[1] == 0 and eqn[2] == 0: x = eqn[3]
+  if eqn[0] + eqn[1] + eqn[2] != 1
+    fail "no unique solution! #{equations.inspect} ==> #{reduced.inspect}"
-  elsif eqn[0] == 0 and eqn[1] == 1 and eqn[2] == 0: y = eqn[3]
-  elsif eqn[0] == 0 and eqn[1] == 0 and eqn[2] == 1: z = eqn[3]
+  elsif eqn[0] == 1: x = eqn[3]
+  elsif eqn[1] == 1: y = eqn[3]
-  else
+  elsif eqn[2] == 1: z = eqn[3]
-    fail "no solution? #{equations.inspect} ==> #{reduced.inspect}"
   end
 end