Index: mttroot/mtt/bin/trans/switch_txt2m
==================================================================
--- mttroot/mtt/bin/trans/switch_txt2m
+++ mttroot/mtt/bin/trans/switch_txt2m
@@ -19,17 +19,19 @@
 #Write some file headers
 lang_header $1 switch m mttx '[mttxs]' > $1_switch.m
 
 # This is the main transformation using gawk
 awk '{
-  if (NR==1){
-    printf("for i=1:%s\n",Nx)
+  if ($1=="#"){
+    printf("for i=1:%s\n", Nx)
     printf("  mttxs(i) = mttx(i);\n")
     printf("end;\n\n")
   }
+  else{
   printf("if (%s==0.0)\n  mttxs(%s)=0.0;\nend;\n\n", $1,$2)
   printf("if (%s<0.0)\n  if (mttx(%s)<0.0)\n    mttxs(%s)=0.0;\n  end;\nend;\n", $1,$2,$2)
+  }
 }' Nx=$Nx < $1_switch.txt >> $1_switch.m