From b00f26ad9a6abd8be146273fe403cc9b131f1b14 Mon Sep 17 00:00:00 2001
From: Duc Le <duc.le@stfc.ac.uk>
Date: Tue, 22 Oct 2024 09:03:00 +0100
Subject: [PATCH] Fix 'sym', 0 behaviour and tutorial 4 #205

---
 swfiles/@spinw/genlattice.m   | 7 +++++--
 tutorials/publish/tutorial4.m | 2 +-
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/swfiles/@spinw/genlattice.m b/swfiles/@spinw/genlattice.m
index a4dc97823..52360db08 100644
--- a/swfiles/@spinw/genlattice.m
+++ b/swfiles/@spinw/genlattice.m
@@ -129,11 +129,14 @@
             ' instead']);
     if ~isempty(param.sym)
         error('spinw:genlattice:WrongInput', ...
-            'Both sym and spgr provided - note sym will be used.');
+            'Both sym and spgr provided - please only use sym.');
     else
         param.sym = param.spgr;
     end
 end
+if ~isempty(param.sym) && isnumeric(param.sym) && param.sym == 0
+    param.sym = [];
+end
 if any(strcmp('angled', varargin(1:2:end))) && ...
         any(strcmp('angle', varargin(1:2:end)))
 	warning('spinw:genlattice:WrongInput', ...
@@ -293,4 +296,4 @@
 
 obj.unit.nformula = int32(param.nformula);
 
-end
\ No newline at end of file
+end
diff --git a/tutorials/publish/tutorial4.m b/tutorials/publish/tutorial4.m
index 3a693a3cf..75b9ebaef 100644
--- a/tutorials/publish/tutorial4.m
+++ b/tutorials/publish/tutorial4.m
@@ -2,7 +2,7 @@
 % We define a square lattice in the ab plane, with Cu+ ions with S=1 spin.
 
 AFsq = spinw;
-AFsq.genlattice('lat_const',[3 3 6],'angled',[90 90 90],'sym',0)
+AFsq.genlattice('lat_const',[3 3 6],'angled',[90 90 90])
 AFsq.addatom('r',[0 0 0],'S', 1,'label','Cu1','color','b')
 AFsq.table('atom')
 plot(AFsq)