Index: lib/matrix.rb
===================================================================
--- lib/matrix.rb	(revision 39032)
+++ lib/matrix.rb	(working copy)
@@ -156,7 +156,7 @@
     end
     size = (rows[0] || []).size
     rows.each do |row|
-      Matrix.Raise ErrDimensionMismatch, "row size differs (#{row.size} should be #{size})" unless row.size == size
+      raise ErrDimensionMismatch, "row size differs (#{row.size} should be #{size})" unless row.size == size
     end
     new rows, size
   end
@@ -286,8 +286,8 @@
   #     => Matrix[[0, 0, 0], [0, 0, 0]]
   #
   def Matrix.empty(row_count = 0, column_count = 0)
-    Matrix.Raise ArgumentError, "One size must be 0" if column_count != 0 && row_count != 0
-    Matrix.Raise ArgumentError, "Negative size" if column_count < 0 || row_count < 0
+    raise ArgumentError, "One size must be 0" if column_count != 0 && row_count != 0
+    raise ArgumentError, "Negative size" if column_count < 0 || row_count < 0
 
     new([[]]*row_count, column_count)
   end
@@ -446,7 +446,7 @@
         end
       end
     else
-      Matrix.Raise ArgumentError, "expected #{which.inspect} to be one of :all, :diagonal, :off_diagonal, :lower, :strict_lower, :strict_upper or :upper"
+      raise ArgumentError, "expected #{which.inspect} to be one of :all, :diagonal, :off_diagonal, :lower, :strict_lower, :strict_upper or :upper"
     end
     self
   end
@@ -508,7 +508,7 @@
         end
       end
     else
-      Matrix.Raise ArgumentError, "expected #{which.inspect} to be one of :all, :diagonal, :off_diagonal, :lower, :strict_lower, :strict_upper or :upper"
+      raise ArgumentError, "expected #{which.inspect} to be one of :all, :diagonal, :off_diagonal, :lower, :strict_lower, :strict_upper or :upper"
     end
     self
   end
@@ -579,7 +579,7 @@
       from_row += row_count if from_row < 0
       from_col += column_count if from_col < 0
     else
-      Matrix.Raise ArgumentError, param.inspect
+      raise ArgumentError, param.inspect
     end
 
     return nil if from_row > row_count || from_col > column_count || from_row < 0 || from_col < 0