how to set ylim range in bar groups figure if two values are negative in matlab

To set the ylim range in a bar groups figure in MATLAB, you can use the ylim function. If you have two or more negative values in your bar plot and you want to include them in the ylim range, you can set the lower limit of the ylim range to a value slightly below the smallest negative value.

Here's an example code snippet to illustrate this:

main.m
% Example data
x = [1 2 3 4];
y = [-2 1 -3 -4];

% Plotting the bar graph
figure;
bar(x, y);

% Get the minimum negative value
min_negative_value = min(y(y < 0));

% Set the ylim range with a buffer
buffer = 1; % Increase this value if necessary
ylim([min_negative_value - buffer, max(y)]);

% Add labels and title
xlabel('X');
ylabel('Y');
title('Bar Groups with Negative Values');
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In this code snippet, we find the minimum negative value (min_negative_value) in the y data. We then set the lower limit of the ylim range slightly below this value by subtracting a buffer (e.g., buffer = 1). The upper limit is set to the maximum value of y.

Adjust the buffer value according to your specific needs to ensure the complete visibility of all negative values in the plot.