You can try something like this:
% Read data from one sheet
data = readtable('base.xlsx','Sheet','Feuil6');
% Read a parameter
temp = data(:,5);
% Reshape the parameter
temp = reshape(temp.lnide,[29 22]);
% Get the country names and years
countries = unique(data.payscode);
countries = cell2mat(countries);
years = unique(data.Ann_e);
% Plot
h = bar3(temp);
ax = gca;
ax.XTick = 1:3:size(years);
ax.XTickLabel = years(1:3:end);
ax.YTick = 1:3:size(countries);
ax.YTickLabel = countries(1:3:end,:);
to get:
Alternate way is to use plot() with different linestyles and line colors. But that will look messy with 29x20 lines for each parameter.
