my bar graph looks messy not evenly spaced in matlab

This issue typically occurs when the values you are plotting are not evenly spaced along the x-axis. To ensure that your bar graph looks properly spaced, you can use categorical values as x-axis labels instead of numerical values.

Here's an example to demonstrate how to create a bar graph with evenly spaced bars using categorical values on the x-axis in MATLAB:

main.m
% Sample data
xData = {'A', 'B', 'C', 'D', 'E'};
yData = [10, 20, 15, 25, 30];

% Create a bar graph
bar(xData, yData);

% Set axis labels
xlabel('Categories');
ylabel('Values');
title('Bar Graph with Categorical Values on X-axis');
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By using categorical values on the x-axis (xData in the example above), MATLAB will ensure that the bars are evenly spaced, even if the actual values are not evenly spaced.

Make sure to adjust xData and yData to match your specific data.