From 223226921799cd5ecda77f77ddf8d801902aa177 Mon Sep 17 00:00:00 2001
From: Brian Taylor <lbwnet@comcast.net>
Date: Fri, 4 Oct 2024 17:06:54 -0700
Subject: [PATCH] Added: Error: Pole/zero analysis is not (yet) supported with
 'option KLU'.     Use 'option sparse' instead.

---
 src/spicelib/analysis/pzan.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/spicelib/analysis/pzan.c b/src/spicelib/analysis/pzan.c
index 9c975889e..faceb6563 100644
--- a/src/spicelib/analysis/pzan.c
+++ b/src/spicelib/analysis/pzan.c
@@ -26,6 +26,14 @@ PZan(CKTcircuit *ckt, int reset)
 
     NG_IGNORE(reset);
 
+#ifdef KLU
+    if (ckt->CKTkluMODE) {
+        fprintf(stderr, "Error: Pole/zero analysis is not (yet) supported with 'option KLU'.\n");
+        fprintf(stderr, "    Use 'option sparse' instead.\n");
+        return(E_UNSUPP);
+    }
+#endif
+
     error = PZinit(ckt);
     if (error != OK) return error;