how to plot different horizontal lines over each group of bar plot

Answer 1

[Star Strider]

Try something like this —

A = (5+rand(10))/6;

figure
hb = bar(A);

for k = 1:numel(hb)
    xep(k,:) = hb(k).XEndPoints;
end
L = min(xep);
R = max(xep);
hold on
plot([L(:) R(:)], [1 1]*0.75, '-k', 'LineWidth',3)
hold off

figure
hb = bar(A);

for k = 1:numel(hb)
    xep(k,:) = hb(k).XEndPoints;
end
L = min(xep);
R = max(xep);
hold on
plot([L(:) R(:)], [1 1]*0.75, '-k', 'LineWidth',3)
hold off
xlim([0.5 2.5])

Make appropriate changes to get the result you want.

EDIT — (8 Dec 2023 at 13:43)

To extend the lines to cover all the bars in each group (rather than stopping at the midpoints), use the normalised ‘Barwidth’ data as well to extend it —

A = (5+rand(10))/6;

figure
hb = bar(A);
BW = hb.BarWidth

BW = 0.8000

for k = 1:numel(hb)
    xep(k,:) = hb(k).XEndPoints;
end
L = min(xep);
R = max(xep);
hold on
plot([L(:) R(:)]+[-0.5  0.5]*BW/numel(hb), [1 1]*0.75, '-k', 'LineWidth',3)
hold off

figure
hb = bar(A);
BW = hb.BarWidth;
for k = 1:numel(hb)
    xep(k,:) = hb(k).XEndPoints;
end
L = min(xep);
R = max(xep);
hold on
plot([L(:) R(:)]+[-0.5  0.5]*BW/numel(hb), [1 1]*0.75, '-k', 'LineWidth',3)
hold off
xlim([0.5 2.5])

.

[priyam kar]

Thank you for help, worked perfectly

[Star Strider]

As always, my pleasure!

Answer 2

[Dyuman Joshi]

Here's a demo -

%Random data
mat = randi([11 19], 4, 6);

%Bar plot
b = bar(mat);
hold on

%Get the x-coordinates of each group (center of each bar)
%Each column represents the x-coordinates of each bar group
x = vertcat(b.XEndPoints)

x = 6×4

0.6667 1.6667 2.6667 3.6667 0.8000 1.8000 2.8000 3.8000 0.9333 1.9333 2.9333 3.9333 1.0667 2.0667 3.0667 4.0667 1.2000 2.2000 3.2000 4.2000 1.3333 2.3333 3.3333 4.3333

%Get the coordinates of the end points
x = x([1 end],:).'

x = 4×2

0.6667 1.3333 1.6667 2.3333 2.6667 3.3333 3.6667 4.3333

plot(x, [5 5], 'LineWidth', 2.5, 'Color', 'k');
hold off

[priyam kar]

Thank you very much for your help, your solution also works perfectly, however i used the other solution provided by Mr. Star Strider. Thank you once again

[Dyuman Joshi]

You are welcome!