MATLAB: How to make a caption or title for the figure legend in MATLAB

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I would like to add a title for my legend within a figure in MATLAB

Best Answer

Since MATLAB R2016a this can be achieved by using the 'title' command described in the following documentation page:

https://www.mathworks.com/help/releases/R2016a/matlab/ref/title.html

For releases prior to MATLAB R2014b, a title for a legend can be added using the following commands:

hl = findobj(gcf,'Tag','legend');
hl_t = get(hl,'Title');
set(hl_t,'String','MyLegendTitle');
Note that this will only work with releases prior to R2014b.

Related Solutions

MATLAB: How to prevent the legend from Auto Updating

Starting in R2017a, if a legend is present, it will auto-update with new plots added to the axes.

The legend has been changed so that by default it updates when data is added to or removed from a plot automatically. To prevent this behavior, set the legends "AutoUpdate" property.

Ex:

x = linspace(0,2*pi);
y = sin(x);
plot(x,y)
legend('sin(x)','AutoUpdate','off')

To affect all new legends, set the value on the root level. To affect all legends in a figure:

fig = figure;
set(fig,'defaultLegendAutoUpdate','off');

To exclude an individual plot from the legend, set the "Annotation" property':

p = plot(1:10,'DisplayName','Line Chart');
hold on
s = stem(1:10,'DisplayName','Stem Chart');
hold off
s.Annotation.LegendInformation.IconDisplayStyle = 'off'; % make the legend for step plot off
legend('show')

For more information about this change, refer to the release notes:

https://www.mathworks.com/help/matlab/release-notes.html?rntext=legend

Also note that the "default" properties system inherits down the entire graphics hierarchy, as documented here:

https://www.mathworks.com/help/matlab/creating_plots/default-property-values.html

One can set the same property on the graphics root and it will apply to all figures in that MATLAB session:

set(groot,'defaultLegendAutoUpdate','off')

The above line can also be added to the MATLAB startup script if the user wants it to apply it to every MATLAB session.

MATLAB: How to obtain the coordinates of the mouse on the screen displayed somewhere in the figure window

This enhancement has been incorporated in MATLAB 7.5 (R2007b).

As a workaround in previous MATLAB releases, you can use the following MATLAB function to track mouse motion:

function mousetrk
%MOUSETRK function to track mouse motion
% This function creates two static text controls
% which contain the x & y coordinates of the mouse
% The driving callback is executed by the
% WindowButtonMotionFcn of the figure.
figure
axes('Visible','off')
xbox = uicontrol('Style','text','Tag','xbox');
xboxlabel = uicontrol('Style','text','String','X Value',...
    'Position',get(xbox,'position')+[0 21 0 0]);
ybox = uicontrol('Style','text','Position',[90 20 60 20],'Tag','ybox');
yboxlabel = uicontrol('Style','text','String','Y Value',...
    'Position',get(ybox,'position')+[0 21 0 0]);
callback = ['pt = get(gca,''CurrentPoint'');'...
  'xbox = findobj(''Tag'',''xbox'');' ...
  'ybox = findobj(''Tag'',''ybox'');' ...
  'set(xbox,''String'',num2str(pt(1,1)));' ...
  'set(ybox,''String'',num2str(pt(1,2)));'];
set(gcf,'WindowButtonMotionFcn',callback);

For more information on the WindowButton functions, please refer to the Handle Graphics Property Browser:

https://www.mathworks.com/help/releases/R2009b/techdoc/infotool/hgprop/doc_frame.html

Best Answer

Related Solutions

MATLAB: How to prevent the legend from Auto Updating

MATLAB: How to obtain the coordinates of the mouse on the screen displayed somewhere in the figure window

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