I want to remove the blank space between the first two bars and the last two bars. Can anyone help please?

I want to remove the blank space in the middle of this figure. Can anyone help please?

This is my code:

figure(30)
x1=T_Smooth{1:4,8};
M1=[T_Smooth{1,5} T_Smooth{1,7}; T_Smooth{2,5} T_Smooth{2,7};T_Smooth{3,5} T_Smooth{3,7};T_Smooth{4,5} T_Smooth{4,7}];
timetoadd1=[T_Smooth{1,9};T_Smooth{2,9};T_Smooth{3,9};T_Smooth{4,9}];
timetoadd2=[T_Smooth{1,11};T_Smooth{2,11};T_Smooth{3,11};T_Smooth{4,11}];
h1=bar(x1,M1,1);
xtips1=h1(1).XEndPoints;
ytips1=h1(1).YEndPoints;
labels1=string(timetoadd1);
text(xtips1,ytips1,labels1,'HorizontalAlignment','center','VerticalAlignment','bottom')
xtips2=h1(2).XEndPoints;
ytips2=h1(2).YEndPoints;
labels2=string(timetoadd2);
text(xtips2,ytips2,labels2,'HorizontalAlignment','center','VerticalAlignment','bottom')
xlabel('Date/Time of the sample')
ylabel('Peak value of concentration (nmol/l)')
ylim([0 130])
legend({'Melatonin','Cortisol'},'Location','northwest')
title('Maximum melatonin & cortisol concentration for participant 1')

This is the figure I mean:

[Tanmay Das]

Can you please provide the mat file for T_smooth?

[Newbie]

T_Smooth=rowfun(@myfun3,T,"InputVariables",["Date/Time_of_sample" "Smooth_Melatonin_concentration" "Smooth_Cortisol_concentration"],"GroupingVariables",["Participant_ID" "Sample_ID"],"OutputVariableNames",["Date/Time_Peak_Mel" "Peak_Mel" "Date/Time_Peak_Cort" "Peak_Cort"]);

[Newbie]

T_Smooth is a table for me.

Answer 1

[the cyclist]

Instead of using the dates in x1 to define the bar positions along the X axis, you could use

h1=bar(M1); % instead of h1=bar(x1,M1);

which will create evenly spaced bars along the X axis.

Then label the X ticks with the date:

set(gca,'XTickLabel',{'Apr 24','Apr 25','May 1','May 2'})

[Newbie]

Thank you, this works!