Edu, this should do:
ndays = length(data(:,1))/2;
ndata = ndays*24;
Tdata = data(:,1);
Rdata = reshape(data(:,2:end)',ndata,[]);
tloc = 12*find((Tdata - 1e3*round(Tdata/1e3)) == 11);
tlab = {'Jan','Feb','Mar','Apr','May','Jun',...
'Jul','Aug','Sep','Oct','Nov','Dec'};
tspan = 1:ndata;
plot(tspan,Rdata,'+-b')
xlabel('Month')
ylabel('[your ylabel]')
title('[your title]')
grid;
set(gca,'XTick',tloc,'XTickLabel',tlab)
Best Answer