How is it possible that Matlab still hasn't created a built in function that automatically inserts a title above a group of subplots?

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F S 2017-9-25

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评论： Michael Wong 2017-11-10

It is 2017, and there still is no easy single command built in function that inserts a title above a group of subplots, even though a Million of users keep asking how to do that. How is that possible?

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Answer 1

Cedric 2017-9-25

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When you start getting picky, you don't use SUBPLOT anymore because it is not that flexible. Instead you create an axes object that covers the full extent and use it for global titles/legends/etc, and you place your other axes by computing their position.

    figure( 'Units', 'normalized', 'Position', [0.2, 0.2, 0.6, 0.6], ...
        'Color', 'white' ) ;
    % - Bg axes and main title.
    bgAxes = axes( 'Position', [0, 0, 1, 1], 'XColor', 'none', 'YColor', 'none', ...
        'XLim', [0, 1], 'YLim', [0, 1] ) ;
    text( 0.5, 0.95, 'A Small Example', 'FontSize', 16, ...
        'HorizontalAlignment', 'center', 'FontWeight', 'bold' ) ;
    % - Positions.
    x = linspace( 0.05, 0.6, 4 ) ;
    w = 0.8 * diff( x(1:2) ) ;
    y = linspace( 0.07, 0.7, 3 ) ;
    h = 0.8 * diff( y(1:2) ) ;
    % - Headers for array still in bgAxes.
    for colId = 1 : numel( x )-1
        text( x(colId)+w/2, 0.03, sprintf( 'Label X%d', colId ), ...
            'HorizontalAlignment', 'center', 'FontWeight', 'bold' ) ;
    end
    for rowId = 1 : numel( y )-1
        text( 0.02, y(rowId)+h/2, sprintf( 'Label Y%d', rowId ), ...
            'HorizontalAlignment', 'center', 'Rotation', 90, 'FontWeight', 'bold' ) ;
    end
    % - Array of plots.
    for colId = 1 : numel( x )-1
        for rowId = 1 : numel( y )-1
            axes( 'Position', [x(colId), y(rowId), w, h] ) ;
            plot( sin( rand(1) * (1:10)), 'b' ) ;
            grid( 'on' ) ;
        end
    end
    % - Surface.
    axes( 'Position', [0.65, 0.45, 0.3, 0.45] ) ;
    [X, Y] = meshgrid( -5: .5 : 5 ) ;
    Z = Y.*sin(X) - X.*cos(Y) ;
    s = surf(X,Y,Z,'FaceAlpha',0.5) ;
    s.EdgeColor = 'none';
    % - Time series
    axes( 'Position', [0.05, 0.72, 0.515, 0.15] ) ;
    x = linspace( 0, 10, 100 ) ;
    plot( rand(size(x)) +  3 * sin(x) .* exp(-x/5), 'r' ) ;
    xlabel( 't [s]' ) ;
    ylabel( 'A [V]' ) ;
    grid( 'on' ) ;
    % - Barchart.
    axes( 'Position', [0.65, 0.05, 0.3, 0.3] ) ;
    histogram( randn(1000, 1) ) ;
    set( gca, 'Box', 'off' ) ;

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Cedric 2017-9-26

编辑：Cedric 2017-9-26

Well, why getting nuts when you could just get picky instead? ;)

More seriously, I agree with you, there should be a builtin for this. In the mean time, you could take 3 minutes for building a function out of Jan's code (that passes varargin{:} to uicontrol so you can add project-specific arguments) and store it somewhere in MATLAB path.

Jan 2017-9-27

+1: A really nice example.

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Answer 2

Jan 2017-9-25

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编辑：Jan 2017-9-26

在 MATLAB Online 中打开

Calm down.

I'm using text() or uicontrol('Style', 'Text') for this purpose. This is fast and easy. I'm not one of your million of users.

uicontrol('Style', 'Text', 'Units', 'Normalized', ...
          'Position', [0.3, 0.95, 0.4,0.05], ...
          'String', 'Super Title')

[EDITED] If want a function:

function H = SubTitle(String, varargin)
H = uicontrol('Style', 'Text', 'Units', 'Normalized', ...
              'Position', [0.3, 0.95, 0.4,0.05], ...
              'String', String, ...
              varargin{:});
end

Now you can append all parameter/value pairs, which are accepted by the uicontrol command: Other positions, font size, etc.

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Adam 2017-9-26

Why do you have to copy and paste it every time you need it?! You create the function and then you have a function. Whether it is a builtin or one you write yourself makes no difference then.

I have thousands of self-written functions to do little tasks within the repository I use. That is the whole point of a programming language, if something doesn't exist you just program it yourself and in a function so you can re-use it!

Michael Wong 2017-11-10