Matlab bar chart plotting issue

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peter huang
peter huang 2023-7-24
评论： Star Strider 2023-7-25
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.

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回答（2 个）

Star Strider
Star Strider 2023-7-24
Ran in:
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.
.
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Dyuman Joshi
Dyuman Joshi 2023-7-25
@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 2023-7-24
Ran in:
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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