Did you convert to datetime as I suggested in the earlier thread? If so, if you have late release (R2016b?) use the ruler format property to set the format that you wish <plot-dates-and-durations>
ADDENDUM OK, see if I did get the interpretation right now or not... :)
Again starting from the previous fixup of the original data in the datetime array...
plot(da,randn(size(da))) % plot against absolute time
% set x-axis limits to beginning of first day, next day after end of data (*)
xlim(datenum(year(da(1)),month(da(1)),[day(da(1)) day(da(end))+1]))
% space ticks on daily interval from first to last of xlim range
dtk=datenum(2010,11,[day(da(1)):day(da(end))+1]);
set(gca,'xtick',dtk)
This yields the following--
Alternatively, if just want the day numbers but not the month label then adding
% set the time format to display numerical days only...
datetick('x','dd','keeplimits','keepticks')
produces
As noted earlier, I've R2014b so the datetime ruler object isn't available, hence the use of datetick. You can use whichever of the tools are in the release you have but the basic idea (I think) should now be clear?
(*) There also likely won't be enough room for 300/24 --> 12+ ticks on a daily basis but try it and see
