First, I make table variables like yours:
d = {'R';'L'};
s = {'JD';'MM';'SH';'YL'};
c = {'B';'G';'R'};
Npts = 1000;
Color = c(randi(numel(c),Npts,1));
HorizontalFinalOffset = 2*randn(Npts,1);
TargetDisplay = d(randi(numel(d),Npts,1));
SubjectID = s(randi(numel(s),Npts,1));
tbl = table(Color,HorizontalFinalOffset,TargetDisplay,SubjectID);
tbl.SubjectID = categorical(tbl.SubjectID);
tbl.TargetDisplay = categorical(tbl.TargetDisplay);
idx = (tbl.TargetDisplay == "L");
tbl_Left_Display = tbl(idx,:)
The boxchart, as you have it already:
figure()
b = boxchart(tbl_Left_Display.SubjectID,tbl_Left_Display.HorizontalFinalOffset,'GroupByColor',tbl_Left_Display.Color,'Notch','on','BoxWidth',1);
colororder([0 0 1; 0 1 0; 1 0 0])
ylim([-8,8])
ylabel('Horizontal Final Offsets')
legend
Now, modifying the gaps between the boxcharts:
Option 1: decreasing 'BoxWidth':
figure()
b = boxchart(tbl_Left_Display.SubjectID,tbl_Left_Display.HorizontalFinalOffset,'GroupByColor',tbl_Left_Display.Color,'Notch','on','BoxWidth',0.5);
colororder([0 0 1; 0 1 0; 1 0 0])
ylim([-8,8])
ylabel('Horizontal Final Offsets')
legend
Option 2: manually setting the XData (adjust as desired):
[s,~,xx] = unique(tbl_Left_Display.SubjectID);
ns = numel(s);
c = {'B';'G';'R'};
nc = numel(c);
figure()
hold on
if nc > 1
offset = 1/max(3,7-nc);
offset = linspace(-offset,offset,nc);
else
offset = 0;
end
width = 1/(2*nc);
for ii = 1:nc
idx = strcmp(tbl_Left_Display.Color,c{ii});
y = tbl_Left_Display.HorizontalFinalOffset(idx);
x = xx(idx)+offset(ii);
boxchart(x,y,'Notch','on','BoxWidth',width);
end
colororder([0 0 1; 0 1 0; 1 0 0])
xlim([0.5 ns+0.5])
xticks(1:ns)
xticklabels(s)
ylim([-8,8])
ylabel('Horizontal Final Offsets')
legend(c)
