check for valid units in pspm_pupil_pp

Author: 4gwe

src/pspm_pupil_pp.m

@@ -153,6 +153,16 @@
 [sts_load, data,infos, pos_of_channel(1)] = pspm_load_channel(alldata, options.channel, 'pupil');
 if sts_load ~= 1, return, end
 
+% Check for invalid pupil data units 
+allowed_units = {'mm', 'cm', 'dm', 'm', 'km', 'in', 'inches'};
+if ~ismember(data.header.units, allowed_units)
+    warning('pspm_pupil_pp:InvalidUnit', ...
+          'Unsupported pupil data unit: %s. Allowed units are: %s', ...
+          data.header.units, strjoin(allowed_units, ', '));
+    return
+end
+
+
 if action_combine
     [sts_load, data_combine, infos, pos_of_channel(2)] = pspm_load_channel(alldata, options.channel_combine, 'pupil');
     if sts_load ~= 1