You cannot achieve the exact placement of the title using only “sgtitle” in MATLAB because the “sgtitle” function is used to add a super title to a group of subplots, and it always positions the text at the very top of the figure, above all axes and will stack each string on a new line if you provide a cell array or a string array of multiple titles. “sgtitle” does not allow you to control the vertical position of the title beyond the top margin.
To display all class names in a single line, horizontally, on the top, concatenate them with a separator (such as space) and use the annotation function to place the textbox accordingly:
% Class titles
Qclass = {'BUS', 'DINOSAUR', 'ELEPHANT'};
% Number of images in each class
numImgsPerClass = 8;
% Generating random image array containing 24 images of size [5 5 3]
images = rand(5, 5, 3, 24);
figure('Name','Query-Results');
montage(images, 'size', [numel(Qclass),numImgsPerClass], "BorderSize", 3);
% Creating a string by concatenating all the class titles with spaces
% Change the number of spaces to align the class names accordingly
titleStr = strjoin(Qclass, [' ' ...
' ']);
% Adding a textbox annotation at the top
% Change the position and size of the textbox accordingly
annotation('textbox', [0, 0.9, 1, 0.1], ... % [x y w h] in normalized units
'String', titleStr, ...
'Color', 'blue', ...
'FontSize', 12, ...
'EdgeColor', 'none', ...
'HorizontalAlignment', 'center');
To place the titles on the left side, concatenate the class names using line breaks:
% Class titles
Qclass = {'BUS', 'DINOSAUR', 'ELEPHANT'};
% Number of images in each class
numImgsPerClass = 8;
% Generating random image array containing 24 images of size [5 5 3]
images = rand(5, 5, 3, 24);
figure('Name','Query-Results');
montage(images, 'size', [numel(Qclass),numImgsPerClass], "BorderSize", 3);
% Creating a string by concatenating all the class titles with line breaks
% Change the number of line breaks to align the class names accordingly
titleStr = strjoin(Qclass, '\n\n\n\n\n\n\n\n\n\n\n\n\n\n');
% Adding a textbox annotation at the left side
% Change the position and size of the textbox accordingly
annotation('textbox', [0, 0.5, 0.1, 0.3], ... % [x y w h] in normalized units
'String', titleStr, ...
'Color', 'blue', ...
'FontSize', 12, ...
'EdgeColor', 'none', ...
'HorizontalAlignment', 'left');
For more help, refer to the following documentations:
Hope this helps!
