It is possible that the title string is too long to be displayed on the given figure, if the figure width is not wide enough. Below are two possible workarounds:
1) Break up the title string into multiple lines, using the cell array syntax, such as:
title({'line1', 'line2', 'line3'});
2) Programmatically resize the figure until the title fully appears in the window. This example is for a title that is too wide for the plot window. It does not consider a title that does not fit vertically:
% Create some dummy data to plot
x = linspace(1,10,100);
y = rand(1,100);
% Get handle to the figure and plot the data
h=figure(1);
plot(x,y);
% Get handle to the title. The title is intentionally too long to fit on
% the default figure window.
ht=title('This is a long and big title to test for the title not appearing on the saved file',...
'FontSize',20);
% Get the title Extent. This shows whether the title is on the figure.
titleExtent = get(ht,'Extent')
% Try to save the image. This shows that the title does not fully appear in
% the saved file.
saveas(h,'Test1','jpg')
% Set the units of the figure to normalized. Where bottom left corner of
% the screen corresponds to Position of (0,0)
set(h,'units','normalized')
% Get the position of the figure. Move the figure down towards the bottom
% left corner of the screen.
Position = get(h,'Position');
set(h,'Position',[0.1 0.1 Position(3) Position(4)])
% Perform a loop while the title is not fully in the figure window
while titleExtent(1)<0
Position = get(h,'Position');
% Resize the figure. Increase the figure by 5%
set(h,'Position',[Position(1) Position(2) 1.05*Position(3) 1.05*Position(4)])
% Force update of the plot.
drawnow;
% Get the new title Extent and check if the title is fully on the plot.
titleExtent = get(ht,'Extent')
end
% Set the PaperPositionMode to auto so saveas or print captures what is
% shown on the screen.
set(h,'PaperPositionMode','auto')
% Do two different methods of saving the figure.
print(h,'-djpeg','-r600','Test2')
saveas(h,'Test3','jpg')
