Add support to qps_gurobi() for Gurobi's PDHG algorithm.

Author: rdzman

CHANGES.md

@@ -5,6 +5,10 @@ Change history for MP-Opt-Model
 since version 5.0
 -----------------
 
+
+#### 12/10/25
+   - Add support for the Gurobi's new PDHG LP solver in `qps_gurobi()`.
+
 #### 11/14/25
   - Add support for the new HiPO interior point LP solver in HiGHS, including
     `have_feature_highs_hipo()` to detect availability.

docs/src/MP-Opt-Model-manual/MP-Opt-Model-manual.tex

@@ -6724,6 +6724,7 @@ \subsubsection*{New Features}
 \item New \code{fix\_integer} option for \code{miqps\_master()} and \code{mp.opt\_model.solve()}. Set to true to fix any integer variables to their initial values, as specified in \code{x0} or \code{opt.x0}.
 \item Add \code{relax\_integer} option to \code{miqps\_master()} and move the implementation from \code{mp.opt\_model.solve()}.
 \item Support for the new HiPO interior point LP solver in the \highs{} optimizer.
+\item Support for the new PDHG LP solver in \gurobi{}.
 \item New functions:
     \begin{itemize}
     \item \code{have\_feature\_highs\_hipo()} feature detection function for HiPO solver in \highs{} optimizer.

lib/mpomver.m

@@ -26,7 +26,7 @@
 v = struct( 'Name',     'MP-Opt-Model', ...
             'Version',  '5.1-dev', ...
             'Release',  '', ...
-            'Date',     '14-Nov-2025' );
+            'Date',     '10-Dec-2025' );
 if nargout > 0
     if nargin > 0
         rv = v;

lib/qps_gurobi.m

@@ -237,11 +237,17 @@
         'interior point',
         'concurrent',
         'deterministic concurrent',
-        'deterministic concurrent simplex'
+        'deterministic concurrent simplex',
+        'PDHG'
     };
     vn = gurobiver;
+    if length(alg_names) >= g_opt.Method+2
+        alg_name = alg_names{g_opt.Method+2};
+    else
+        alg_name = 'unknown';
+    end
     fprintf('Gurobi Version %s -- %s %s solver\n', ...
-        vn, alg_names{g_opt.Method+2}, lpqp);
+        vn, alg_name, lpqp);
 end
 results = gurobi(m, g_opt);
 switch results.status