Hey @avihai, please refer to the below example code , please take it as a reference and modify it accordingly
A = [1 2 3 4 5 6];
B = [3 1 2 1 2 1];
% Define the maximum possible index value from B.
% If B could contain indices larger than 5, you'd use max(B) instead of a fixed 5.
max_b_value = 5;
% 1. Group the A values by their corresponding B indices
% We'll use a cell array to store values for each index, as they can have different counts.
grouped_data = cell(1, max_b_value);
for i = 1:length(A)
current_index = B(i);
current_value = A(i);
if current_index >= 1 && current_index <= max_b_value
grouped_data{current_index} = [grouped_data{current_index}, current_value];
else
warning('Index %d from B is out of the expected range (1 to %d). Skipping.', current_index, max_b_value);
end
end
% 2. Prepare the data for the bar plot
% The 'bar' function expects a matrix where each column represents an X-axis group
% and rows represent the different bars within that group.
% We need to pad shorter groups with NaN (Not a Number) so all columns have the same length.
% Find the maximum number of values for any single index
max_bars_per_index = 0;
for i = 1:max_b_value
max_bars_per_index = max(max_bars_per_index, length(grouped_data{i}));
end
plot_matrix = NaN(max_bars_per_index, max_b_value);
for i = 1:max_b_value
current_group_values = grouped_data{i};
if ~isempty(current_group_values)
plot_matrix(1:length(current_group_values), i) = current_group_values;
end
end
figure;
% Use the 'bar' function. By default, it creates grouped bars if the input is a matrix.
h = bar(plot_matrix);
xticks(1:max_b_value);
xticklabels(arrayfun(@num2str, 1:max_b_value, 'UniformOutput', false)); % Label ticks with numbers
xlabel('Index from B');
ylabel('Value from A');
title('Values from A Grouped by Index from B');
grid on;
