--- a/doc/interpreter/arith.txi
+++ b/doc/interpreter/arith.txi
@@ -18,7 +18,7 @@
 * Mathematical Constants::      
 @end menu
 
-@node Utility Functions, Complex Arithmetic, Arithmetic, Arithmetic
+@node Utility Functions
 @section Utility Functions
 
 The following functions are available for working with complex numbers.
@@ -62,7 +62,7 @@
 
 @DOCSTRING(sqrt)
 
-@node Complex Arithmetic, Trigonometry, Utility Functions, Arithmetic
+@node Complex Arithmetic
 @section Complex Arithmetic
 
 The following functions are available for working with complex
@@ -90,7 +90,7 @@
 
 @DOCSTRING(real)
 
-@node Trigonometry, Sums and Products, Complex Arithmetic, Arithmetic
+@node Trigonometry
 @section Trigonometry
 
 Octave provides the following trigonometric functions.  Angles are
@@ -147,7 +147,7 @@
 @DOCSTRING(atan2)
 
 
-@node Sums and Products, Special Functions, Trigonometry, Arithmetic
+@node Sums and Products
 @section Sums and Products
 
 @DOCSTRING(sum)
@@ -160,7 +160,7 @@
 
 @DOCSTRING(sumsq)
 
-@node Special Functions, Coordinate Transformations, Sums and Products, Arithmetic
+@node Special Functions
 @section Special Functions
 
 @DOCSTRING(besselj)
@@ -191,7 +191,7 @@
 
 @DOCSTRING(duplication_matrix)
 
-@node Coordinate Transformations, Mathematical Constants, Special Functions, Arithmetic
+@node Coordinate Transformations
 @section Coordinate Transformations
 
 @DOCSTRING(cart2pol)
@@ -202,7 +202,7 @@
 
 @DOCSTRING(sph2cart)
 
-@node Mathematical Constants,  , Coordinate Transformations, Arithmetic
+@node Mathematical Constants
 @section Mathematical Constants
 
 @DOCSTRING(I)

--- a/doc/interpreter/data.txi
+++ b/doc/interpreter/data.txi
@@ -40,6 +40,7 @@
 
 @menu
 * Numeric Objects::             
+* Missing Data::                
 * String Objects::              
 * Data Structure Objects::      
 @end menu
@@ -79,6 +80,16 @@
 
 @xref{Numeric Data Types}, for more information.
 
+@node Missing Data
+@subsection Missing Data
+@cindex missing data
+
+@DOCSTRING(NA)
+
+@DOCSTRING(isna)
+
+@DOCSTRING(is_nan_or_na)
+
 @node String Objects
 @subsection String Objects
 @cindex strings

--- a/doc/interpreter/errors.txi
+++ b/doc/interpreter/errors.txi
@@ -20,6 +20,10 @@
 
 @DOCSTRING(usage)
 
+@DOCSTRING(lasterr)
+
+@DOCSTRING(lastwarn)
+
 The following pair of functions are of limited usefulness, and may be
 removed from future versions of Octave.
 

--- a/doc/interpreter/io.txi
+++ b/doc/interpreter/io.txi
@@ -2,7 +2,7 @@
 @c This is part of the Octave manual.
 @c For copying conditions, see the file gpl.texi.
 
-@node Input and Output, Plotting, Error Handling, Top
+@node Input and Output
 @chapter Input and Output
 
 There are two distinct classes of input and output functions.  The first

--- a/doc/interpreter/plot.txi
+++ b/doc/interpreter/plot.txi
@@ -215,6 +215,14 @@
 
 @DOCSTRING(stairs)
 
+@DOCSTRING(errorbar)
+
+@DOCSTRING(loglogerr)
+
+@DOCSTRING(semilogxerr)
+
+@DOCSTRING(semilogyerr)
+
 @node Three-Dimensional Plotting
 @section Three-Dimensional Plotting
 

--- a/doc/interpreter/system.txi
+++ b/doc/interpreter/system.txi
@@ -85,6 +85,8 @@
 
 @DOCSTRING(strftime)
 
+@DOCSTRING(strptime)
+
 Most of the remaining functions described in this section are not
 patterned after the standard C library.  Some are available for
 compatiblity with @sc{Matlab} and others are provided because they are
@@ -121,6 +123,8 @@
 
 @DOCSTRING(symlink)
 
+@DOCSTRING(readlink)
+
 @DOCSTRING(unlink)
 
 @DOCSTRING(readdir)

--- a/src/dirfns.cc
+++ b/src/dirfns.cc
@@ -459,7 +459,7 @@
 
 DEFUN (readlink, args, ,
   "-*- texinfo -*-\n\
-@deftypefn {Built-in Function} {[@var{result}, @var{err}, @var{msg}] =} symlink (@var{symlink})\n\
+@deftypefn {Built-in Function} {[@var{result}, @var{err}, @var{msg}] =} readlink (@var{symlink})\n\
 Read the value of the symbolic link @var{symlink}.\n\
 \n\
 If successful, @var{result} contains the contents of the symbolic link\n\