# HG changeset patch
# User jwe
# Date 1068829739 0
# Node ID 02d2fcf835fc7c9f587a8937fc8033dd947731a9
# Parent  ac4e4807acc5f1586a7e65c7fa6c28adcfb768f4
[project @ 2003-11-14 17:08:59 by jwe]

diff -r ac4e4807acc5 -r 02d2fcf835fc scripts/ChangeLog
--- a/scripts/ChangeLog	Fri Nov 14 16:15:41 2003 +0000
+++ b/scripts/ChangeLog	Fri Nov 14 17:08:59 2003 +0000
@@ -4,6 +4,8 @@
 
 	* linear-algebra/krylovb.m: Fix typo in usage message.
 
+	* general/isdefinite.m: New function.
+
 2003-10-29  John W. Eaton  <jwe@bevo.che.wisc.edu>
 
 	* general/reshape: Delete.
diff -r ac4e4807acc5 -r 02d2fcf835fc scripts/general/isdefinite.m
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/scripts/general/isdefinite.m	Fri Nov 14 17:08:59 2003 +0000
@@ -0,0 +1,57 @@
+## Copyright (C) 2003 Gabriele Pannocchia
+##
+## This file is part of Octave.
+##
+## Octave is free software; you can redistribute it and/or modify it
+## under the terms of the GNU General Public License as published by
+## the Free Software Foundation; either version 2, or (at your option)
+## any later version.
+##
+## Octave is distributed in the hope that it will be useful, but
+## WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+## General Public License for more details.
+##
+## You should have received a copy of the GNU General Public License
+## along with Octave; see the file COPYING.  If not, write to the Free
+## Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+## 02111-1307, USA.
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {} isdefinite (@var{x},@var{tol})
+## Return 1 if @var{x} is symmetric positive definite within the
+## tolerance specified by @var{tol} or 0 if @var{x} is symmetric
+## positive semidefinite.  Otherwise, return -1.  If @var{tol}
+## is omitted, use a tolerance equal to 100 times the machine precision.  
+## @end deftypefn
+## @seealso{issymmetric}
+
+## Author: Gabriele Pannocchia <g.pannocchia@ing.unipi.it>
+## Created: November 2003
+## Adapted-By: jwe
+
+function retval = isdefinite (x, tol)
+
+  if (nargin == 1 || nargin == 2)
+    if (nargin == 1)
+      tol = 100*eps;
+    endif
+    sym = issymmetric (x, tol);
+    if (sym > 0)
+      ## Matrix is symmetric, check eigenvalues.
+      mineig = min (eig (x));
+      if (mineig > tol)
+	retval = 1;
+      elseif (mineig > -tol)
+	retval = 0;
+      else
+	retval = -1;
+      end
+    else
+      error ("isdefinite: matrix x must be symmetric");
+    endif
+  else
+    usage ("isdefinite (x,tol)");
+  endif
+
+endfunction
diff -r ac4e4807acc5 -r 02d2fcf835fc src/ChangeLog
--- a/src/ChangeLog	Fri Nov 14 16:15:41 2003 +0000
+++ b/src/ChangeLog	Fri Nov 14 17:08:59 2003 +0000
@@ -1,5 +1,9 @@
 2003-11-13  John W. Eaton  <jwe@bevo.che.wisc.edu>
 
+	* utils.cc (Fisvarname): Pass correct name to make_argv.
+
+	* ov-cell.cc (Fiscellstr): New function.
+
 	* ov-file.h (octave_file::all, octave_file::any,
 	octave_file::dims, octave_file::is_real_type,
 	octave_file::ist_real_scalar): New functions.
diff -r ac4e4807acc5 -r 02d2fcf835fc src/file-io.cc
--- a/src/file-io.cc	Fri Nov 14 16:15:41 2003 +0000
+++ b/src/file-io.cc	Fri Nov 14 17:08:59 2003 +0000
@@ -1181,6 +1181,7 @@
 \n\
 @item \"unsigned char\"\n\
 @itemx \"uchar\"\n\
+@itemx \"uint8\"\n\
 Unsigned character.\n\
 \n\
 @item \"short\"\n\
@@ -1216,11 +1217,17 @@
 \n\
 @item \"integer*2\"\n\
 @itemx \"int16\"\n\
-Two byte integer.\n\
+Two byte signed integer.\n\
 \n\
 @item \"integer*4\"\n\
 @itemx \"int32\"\n\
-Four byte integer.\n\
+Four byte signed integer.\n\
+\n\
+@item \"uint16\"\n\
+Two byte unsigned integer.\n\
+\n\
+@item \"uint32\"\n\
+Four byte unsigned integer.\n\
 @end table\n\
 \n\
 @noindent\n\
diff -r ac4e4807acc5 -r 02d2fcf835fc src/ov-cell.cc
--- a/src/ov-cell.cc	Fri Nov 14 16:15:41 2003 +0000
+++ b/src/ov-cell.cc	Fri Nov 14 17:08:59 2003 +0000
@@ -506,6 +506,46 @@
   return retval;
 }
 
+DEFUN (iscellstr, args, ,
+  "-*- texinfo -*-\n\
+@deftypefn {Built-in Function} {} iscellstr (@var{cell})\n\
+Return true if every element of the cell array @var{cell} is a\n\
+character string\n\
+@end deftypefn")
+{
+  octave_value retval = true;
+
+  if (args.length () == 1)
+    {
+      octave_value arg = args (0);
+
+      if (arg.is_cell ())
+	{
+	  Cell c = args(0).cell_value ();
+
+	  if (! error_state)
+	    {
+	      for (int i = 0; i < c.length (); i++)
+		{
+		  if (! c(i).is_string ())
+		    {
+		      retval = false;
+		      break;
+		    }
+		}
+	    }
+	  else
+	    error ("iscellstr: expecting argument to be a cell");
+	}
+      else
+	retval = false;
+    }
+  else
+    print_usage ("iscellstr");
+
+  return retval;
+}
+
 /*
 ;;; Local Variables: ***
 ;;; mode: C++ ***
diff -r ac4e4807acc5 -r 02d2fcf835fc src/utils.cc
--- a/src/utils.cc	Fri Nov 14 16:15:41 2003 +0000
+++ b/src/utils.cc	Fri Nov 14 17:08:59 2003 +0000
@@ -107,7 +107,7 @@
 
   int argc = args.length () + 1;
 
-  string_vector argv = args.make_argv ("help");
+  string_vector argv = args.make_argv ("isvarname");
 
   if (error_state)
     return retval;