# HG changeset patch
# User Rik <rik@octave.org>
# Date 1405353285 25200
# Node ID d0d0858cfab166b39252bed3b7c628c03349b3c9
# Parent  c4def7ab39e79fbb76ce50c379a3e6d5223b5806
doc: Match docstring variable names to function variable names for linear-algebra m-files.

* isbanded.m, isdefinite.m, isdiag.m, ishermitian.m, issymmetric.m, istril.m,
istriu.m: Use 'A' for input matrix in linear algebra routines.  Change docstrings
from 'x' to 'A'.

diff -r c4def7ab39e7 -r d0d0858cfab1 scripts/linear-algebra/isbanded.m
--- a/scripts/linear-algebra/isbanded.m	Sun Jul 13 21:25:47 2014 -0700
+++ b/scripts/linear-algebra/isbanded.m	Mon Jul 14 08:54:45 2014 -0700
@@ -17,8 +17,8 @@
 ## <http://www.gnu.org/licenses/>.
 
 ## -*- texinfo -*-
-## @deftypefn {Function File} {} isbanded (@var{x}, @var{lower}, @var{upper})
-## Return true if @var{x} is a matrix with entries confined between
+## @deftypefn {Function File} {} isbanded (@var{A}, @var{lower}, @var{upper})
+## Return true if @var{A} is a matrix with entries confined between
 ## @var{lower} diagonals below the main diagonal and @var{upper} diagonals
 ## above the main diagonal.
 ##
diff -r c4def7ab39e7 -r d0d0858cfab1 scripts/linear-algebra/isdefinite.m
--- a/scripts/linear-algebra/isdefinite.m	Sun Jul 13 21:25:47 2014 -0700
+++ b/scripts/linear-algebra/isdefinite.m	Mon Jul 14 08:54:45 2014 -0700
@@ -17,13 +17,13 @@
 ## <http://www.gnu.org/licenses/>.
 
 ## -*- texinfo -*-
-## @deftypefn  {Function File} {} isdefinite (@var{x})
-## @deftypefnx {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
+## @deftypefn  {Function File} {} isdefinite (@var{A})
+## @deftypefnx {Function File} {} isdefinite (@var{A}, @var{tol})
+## Return 1 if @var{A} is symmetric positive definite within the
+## tolerance specified by @var{tol} or 0 if @var{A} is symmetric
 ## positive semidefinite.  Otherwise, return -1.  If @var{tol}
 ## is omitted, use a tolerance of
-## @code{100 * eps * norm (@var{x}, "fro")}
+## @code{100 * eps * norm (@var{A}, "fro")}
 ## @seealso{issymmetric, ishermitian}
 ## @end deftypefn
 
@@ -31,30 +31,30 @@
 ## Created: November 2003
 ## Adapted-By: jwe
 
-function retval = isdefinite (x, tol)
+function retval = isdefinite (A, tol)
 
   if (nargin < 1 || nargin > 2)
     print_usage ();
   endif
 
-  if (! isfloat (x))
-    x = double (x);
+  if (! isfloat (A))
+    A = double (A);
   endif
 
   if (nargin == 1)
-    tol = 100 * eps (class (x)) * norm (x, "fro");
+    tol = 100 * eps (class (A)) * norm (A, "fro");
   endif
 
-  if (! ishermitian (x, tol))
-    error ("isdefinite: X must be a Hermitian matrix");
+  if (! ishermitian (A, tol))
+    error ("isdefinite: A must be a Hermitian matrix");
   endif
 
-  e = tol * eye (rows (x));
-  [r, p] = chol (x - e);
+  e = tol * eye (rows (A));
+  [r, p] = chol (A - e);
   if (p == 0)
     retval = 1;
   else
-    [r, p] = chol (x + e);
+    [r, p] = chol (A + e);
     if (p == 0)
       retval = 0;
     else
@@ -83,5 +83,5 @@
 
 %!error isdefinite ()
 %!error isdefinite (1,2,3)
-%!error <X must be a Hermitian matrix> isdefinite ([1 2; 3 4])
+%!error <A must be a Hermitian matrix> isdefinite ([1 2; 3 4])
 
diff -r c4def7ab39e7 -r d0d0858cfab1 scripts/linear-algebra/isdiag.m
--- a/scripts/linear-algebra/isdiag.m	Sun Jul 13 21:25:47 2014 -0700
+++ b/scripts/linear-algebra/isdiag.m	Mon Jul 14 08:54:45 2014 -0700
@@ -17,8 +17,8 @@
 ## <http://www.gnu.org/licenses/>.
 
 ## -*- texinfo -*-
-## @deftypefn {Function File} {} isdiag (@var{x})
-## Return true if @var{x} is a diagonal matrix.
+## @deftypefn {Function File} {} isdiag (@var{A})
+## Return true if @var{A} is a diagonal matrix.
 ## @seealso{isbanded, istril, istriu, diag, bandwidth}
 ## @end deftypefn
 
diff -r c4def7ab39e7 -r d0d0858cfab1 scripts/linear-algebra/ishermitian.m
--- a/scripts/linear-algebra/ishermitian.m	Sun Jul 13 21:25:47 2014 -0700
+++ b/scripts/linear-algebra/ishermitian.m	Mon Jul 14 08:54:45 2014 -0700
@@ -18,13 +18,14 @@
 ## <http://www.gnu.org/licenses/>.
 
 ## -*- texinfo -*-
-## @deftypefn  {Function File} {} ishermitian (@var{x})
-## @deftypefnx {Function File} {} ishermitian (@var{x}, @var{tol})
-## Return true if @var{x} is Hermitian within the tolerance specified by
+## @deftypefn  {Function File} {} ishermitian (@var{A})
+## @deftypefnx {Function File} {} ishermitian (@var{A}, @var{tol})
+## Return true if @var{A} is Hermitian within the tolerance specified by
 ## @var{tol}.
+##
 ## The default tolerance is zero (uses faster code).
-## Matrix @var{x} is considered symmetric if
-## @code{norm (@var{x} - @var{x}', Inf) / norm (@var{x}, Inf) < @var{tol}}.
+## Matrix @var{A} is considered symmetric if
+## @code{norm (@var{A} - @var{A}', Inf) / norm (@var{A}, Inf) < @var{tol}}.
 ## @seealso{issymmetric, isdefinite}
 ## @end deftypefn
 
@@ -32,19 +33,19 @@
 ## Created: August 1993
 ## Adapted-By: jwe
 
-function retval = ishermitian (x, tol = 0)
+function retval = ishermitian (A, tol = 0)
 
   if (nargin < 1 || nargin > 2)
     print_usage ();
   endif
 
-  retval = isnumeric (x) && issquare (x);
+  retval = isnumeric (A) && issquare (A);
   if (retval)
     if (tol == 0)
-      retval = all ((x == x')(:));
+      retval = all ((A == A')(:));
     else
-      norm_x = norm (x, inf);
-      retval = norm_x == 0 || norm (x - x', inf) / norm_x <= tol;
+      norm_x = norm (A, inf);
+      retval = norm_x == 0 || norm (A - A', inf) / norm_x <= tol;
     endif
   endif
 
diff -r c4def7ab39e7 -r d0d0858cfab1 scripts/linear-algebra/issymmetric.m
--- a/scripts/linear-algebra/issymmetric.m	Sun Jul 13 21:25:47 2014 -0700
+++ b/scripts/linear-algebra/issymmetric.m	Mon Jul 14 08:54:45 2014 -0700
@@ -18,12 +18,14 @@
 ## <http://www.gnu.org/licenses/>.
 
 ## -*- texinfo -*-
-## @deftypefn  {Function File} {} issymmetric (@var{x})
-## @deftypefnx {Function File} {} issymmetric (@var{x}, @var{tol})
-## Return true if @var{x} is a symmetric matrix within the tolerance specified
-## by @var{tol}.  The default tolerance is zero (uses faster code).
-## Matrix @var{x} is considered symmetric if
-## @code{norm (@var{x} - @var{x}.', Inf) / norm (@var{x}, Inf) < @var{tol}}.
+## @deftypefn  {Function File} {} issymmetric (@var{A})
+## @deftypefnx {Function File} {} issymmetric (@var{A}, @var{tol})
+## Return true if @var{A} is a symmetric matrix within the tolerance specified
+## by @var{tol}.
+##
+## The default tolerance is zero (uses faster code).
+## Matrix @var{A} is considered symmetric if
+## @code{norm (@var{A} - @var{A}.', Inf) / norm (@var{A}, Inf) < @var{tol}}.
 ## @seealso{ishermitian, isdefinite}
 ## @end deftypefn
 
@@ -31,20 +33,20 @@
 ## Created: August 1993
 ## Adapted-By: jwe
 
-function retval = issymmetric (x, tol = 0)
+function retval = issymmetric (A, tol = 0)
 
   if (nargin < 1 || nargin > 2)
     print_usage ();
   endif
 
-  retval = (isnumeric (x) || islogical (x)) && issquare (x);
+  retval = (isnumeric (A) || islogical (A)) && issquare (A);
   if (retval)
     if (tol == 0)
       ## Handle large sparse matrices as well as full ones
-      retval = nnz (x != x.') == 0;
+      retval = nnz (A != A.') == 0;
     else
-      norm_x = norm (x, inf);
-      retval = norm_x == 0 || norm (x - x.', inf) / norm_x <= tol;
+      norm_x = norm (A, inf);
+      retval = norm_x == 0 || norm (A - A.', inf) / norm_x <= tol;
     endif
   endif
 
diff -r c4def7ab39e7 -r d0d0858cfab1 scripts/linear-algebra/istril.m
--- a/scripts/linear-algebra/istril.m	Sun Jul 13 21:25:47 2014 -0700
+++ b/scripts/linear-algebra/istril.m	Mon Jul 14 08:54:45 2014 -0700
@@ -17,8 +17,8 @@
 ## <http://www.gnu.org/licenses/>.
 
 ## -*- texinfo -*-
-## @deftypefn {Function File} {} istril (@var{x})
-## Return true if @var{x} is a lower triangular matrix.
+## @deftypefn {Function File} {} istril (@var{A})
+## Return true if @var{A} is a lower triangular matrix.
 ##
 ## A lower triangular matrix has nonzero entries only on the main diagonal
 ## and below.
diff -r c4def7ab39e7 -r d0d0858cfab1 scripts/linear-algebra/istriu.m
--- a/scripts/linear-algebra/istriu.m	Sun Jul 13 21:25:47 2014 -0700
+++ b/scripts/linear-algebra/istriu.m	Mon Jul 14 08:54:45 2014 -0700
@@ -17,8 +17,8 @@
 ## <http://www.gnu.org/licenses/>.
 
 ## -*- texinfo -*-
-## @deftypefn {Function File} {} istriu (@var{x})
-## Return true if @var{x} is an upper triangular matrix.
+## @deftypefn {Function File} {} istriu (@var{A})
+## Return true if @var{A} is an upper triangular matrix.
 ##
 ## An upper triangular matrix has nonzero entries only on the main diagonal
 ## and above.