Add option 'klu', keeping option 'sparse'. Sparse is default.

src/include/ngspice/optdefs.h

@@ -124,6 +124,7 @@ enum {
 
 #ifdef KLU
     OPT_SPARSE,
+    OPT_KLU,
     OPT_KLU_MEMGROW_FACTOR,
 #endif
 

src/spicelib/analysis/cktntask.c

@@ -141,7 +141,7 @@ CKTnewTask(CKTcircuit *ckt, TSKtask **taskPtr, IFuid taskName, TSKtask **defPtr)
         tsk->TSKepsmin          = 1e-28;
 
 #ifdef KLU
-        tsk->TSKkluMODE         = CKTkluON;
+        tsk->TSKkluMODE         = CKTkluOFF;
         tsk->TSKkluMemGrowFactor = 1.2 ;
 #endif
 

src/spicelib/analysis/cktsopt.c

@@ -181,6 +181,10 @@ CKTsetOpt(CKTcircuit *ckt, JOB *anal, int opt, IFvalue *val)
         task->TSKkluMODE = (val->iValue == 0);
         break;
 
+    case OPT_KLU:
+        task->TSKkluMODE = (val->iValue == 1);
+        break;
+
     case OPT_KLU_MEMGROW_FACTOR:
         task->TSKkluMemGrowFactor = (val->rValue == 1.2);
         break;
@@ -348,6 +352,8 @@ static IFparm OPTtbl[] = {
 #ifdef KLU
  { "sparse", OPT_SPARSE, IF_SET|IF_FLAG,
         "Set SPARSE 1.3 as Direct Linear Solver" },
+ { "klu", OPT_KLU, IF_SET | IF_FLAG,
+        "Set KLU as Direct Linear Solver" },
  { "klu_memgrow_factor", OPT_KLU_MEMGROW_FACTOR, IF_SET|IF_REAL,
         "KLU Memory Grow Factor (default is 1.2)" }
 #endif