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Matlab bar chart plotting issue

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peter huang
peter huang on 24 Jul 2023
Commented: Star Strider on 25 Jul 2023
I have two sets of data and I am using the Matlab "bar" function to create a bar chart. However, I would like to enhance the plot by adding a trend line. When I tried using the "plot" function, I found that the points did not align with the bars in the bar chart. I'd like to know if, when encountering this issue, creating another corresponding array for the x-values and adjusting it is the only way to align the trend line with the bars, or if the "bar" function has built-in capabilities to directly plot a trend line.
clear all ; clc ; clf
set(gcf,'color','w')
load m_time.mat
%%
y1 = 1 : 1 : 10
y2 = [0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0]
y = [y1 ;y2]
bar(m_time_112 , y )
hold on
plot(m_time_112 , y1,'o-')
plot(m_time_112 , y2,'*-')
I want the effect to be something like this: aligning the x-points of the "plot" function with the bars of the "bar" chart.

Answers (2)

Star Strider
Star Strider on 24 Jul 2023
Recent MATLAB releases can return the (x,y) coordinates of the bar end points.
Using those, the result improves considerably —
% type('bar_q.m')
LD = load('m_time.mat');
m_time_112 = LD.m_time_112;
y1 = 1 : 1 : 10;
y2 = [0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0];
y = [y1 ;y2];
figure
hb = bar(m_time_112 , y );
xep1 = hb(1).XEndPoints;
yep1 = hb(1).YEndPoints;
xep2 = hb(2).XEndPoints;
yep2 = hb(2).YEndPoints;
hold on
plot(xep1 , yep1,'o-')
plot(xep2 , yep2,'*-')
If you have an earlier MATLAB version, this is still possible, however more complicated.
.
  5 Comments
Dyuman Joshi
Dyuman Joshi on 25 Jul 2023
@Star Strider Ah, I see. Thanks for the info!
@peter huang if this answer solved your problem, please consider accepting the answer.
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Raheel Naveed
Raheel Naveed on 24 Jul 2023
clc; clear; close all;
set(gcf,'color','w')
% load m_time.mat % Load your data here
y1 = 1 : 10;
y2 = 0.1:0.1:1;
y = [y1 ;y2];
numBars = numel(y1);
numSeries = size(y, 1);
groupWidth = min(0.8, numSeries/(numSeries+1.5));
bar(y', 'BarWidth', groupWidth);
hold on
x = 1:numBars;
for i = 1:size(y, 1)
% Calculate center of each bar
xAdjusted = x - groupWidth/2 + (2*i-1) * groupWidth / (2*numSeries);
p = polyfit(x, y(i,:), 1);
y_fit = polyval(p, x);
plot(xAdjusted, y_fit, 'o-', 'LineWidth', 2);
end
hold off

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