Fix regressions caused by ismatrix definition change (partial fix bug #47036). * inputdlg.m: Test that linespec isnumeric. * uigetfile.m: Check that position property value isnumeric. * fminunc.m: Check that x0 isnumeric. * fsolve.m: Check that x0 isnumeric. * lsqnonneg.m: Check that inputs C & D are both isnumeric and ismatrix. * pqpnonneg.m: Check that inputs C & D are both isnumeric and ismatrix. * bicg.m: Check input A issquare. Rephrase error messages. * bicgstab.m: Check input A issquare. Rephrase error messages. * cgs.m: Check input A issquare. Rephrase error messages. * gmres.m: Check input A issquare. Rephrase error messages. Change BIST test to match new error message. * qmr.m: Check input A issquare. Rephrase error messages. * spconvert.m: Check nargin first. Simplify input validation. Wrap long error message to < 80 chars. * treeplot.m: Simplify input validation.

--- a/scripts/optimization/pqpnonneg.m	Sat Jan 30 07:55:18 2016 -0800
+++ b/scripts/optimization/pqpnonneg.m	Mon Feb 01 22:59:43 2016 -0800
@@ -79,7 +79,9 @@
   endif
 
   if (nargin < 2 || nargin > 4
-      || ! (ismatrix (c) && ismatrix (d) && isstruct (options)))
+      || ! (isnumeric (c) && ismatrix (c))
+      || ! (isnumeric (d) && ismatrix (d))
+      || ! isstruct (options))
     print_usage ();
   endif