Reduce Legend line size and box accordingly

This code generates a plot that I would put directly on a paper. I have troubles reducing the legend lines length and legend box accordingly such that it does appear nicer. Any input is appreciated. Thank you.

if true

f = 1e3;
t_step = 1/f/100; 
t = [0:t_step:3/f];
A0 = 1;
B0 = 3;
a = A0*sin(2*pi*f*t);
b = B0*cos(2*pi*f*t);

plot_scale = 1;

% plot size and position in centimeter
plot_width      = 6.6*plot_scale;
plot_height     = 4.5*plot_scale;
plot_position_x = 7.0;
plot_position_y = 20.0;

% window figure title
window_title = 'Test Figure';

% axis label (LaTeX syntax)
x_label = 'time - $t$ (ms)';
y_label = '(V)';

% axis limit
x_limit = [0 3];
y_limit = [-4 4];

% axis number of tick
x_tick = 2;
y_tick = 3;

x_tick = x_tick+2;
y_tick = y_tick+2;

% legend entries (LaTeX syntax)
y1_legend_entry = '$v_\mathrm{in}$';
y2_legend_entry = '$v_\mathrm{out}$';

% font size
font_size_label  = 9;
font_size_legend = font_size_label;

% filename
filename = 'test_figure';

% color
color(1,:) = [0.0000    0.4470    0.7410];
color(2,:) = [0.8500    0.3250    0.0980];

%-------------------------------------------------------------------------%

%figure
figure('Name', window_title, 'Color', 'White', 'Units', 'centimeter', 'Position', [plot_position_x plot_position_y plot_width plot_height]);

hold on;

h_y1  = plot(t*1e3, a,                                 '-', 'Color',color(1,:), 'LineWidth',1);
h_y2  = plot(t*1e3, b,                                 '-', 'Color',color(2,:), 'LineWidth',1);
h2_y1 = plot(t(10:10:(end-10))*1e3, a(10:10:(end-10)), 'o', 'Color',color(1,:), 'MarkerSize',2, 'MarkerFaceColor',color(1,:));

h_x_label    = xlabel(x_label, 'Interpreter','latex');
h_y_label    = ylabel(y_label, 'Interpreter','latex');

h_legend = legend([h_y1, h_y2], y1_legend_entry,y2_legend_entry, 'Location','NorthEast');
set(h_legend, 'Interpreter','latex');

set([h_legend, gca], 'FontSize',font_size_legend);
set([h_x_label, h_y_label, gca], 'FontSize',font_size_label);

set(gca, ...
  'Box'                , 'on'        , ...
  'BoxStyle'           , 'back'      , ...
  'TickDir'            , 'in'        , ...
  'TickLength'         , 0.01*[1 1]  , ...
  'XScale'             , 'linear'    , ...
  'YScale'             , 'linear'    , ...
  'XLim'               , x_limit     , ...
  'YLim'               , y_limit     , ...
  'XTick'              , linspace(x_limit(1), x_limit(2), x_tick), ...
  'YTick'              , linspace(y_limit(1), y_limit(2), y_tick), ...
  'TickLabelInterpreter', 'latex'    , ...
  'XMinorTick'         , 'on'        , ...
  'YMinorTick'         , 'on'        , ...
  'XGrid'              , 'on'        , ...  
  'YGrid'              , 'on'        , ...
  'XMinorGrid'         , 'off'       , ...  
  'YMinorGrid'         , 'off'       , ...
  'GridLineStyle'      , '-'         , ...
  'GridColor'          , 0.3*[1 1 1] , ...
  'GridAlpha'          , 0.5         , ...
  'MinorGridLineStyle' , '-'         , ...
  'MinorGridColor'     , 0.1*[1 1 1] , ...
  'MinorGridAlpha'     , 0.5         , ...
  'XColor'             , 'k'         , ...
  'YColor'             , 'k'         , ...
  'LineWidth'          , 0.35        );

set(gcf, 'PaperPositionMode', 'auto');

end

Answer 1

[Samya]

To reduce the legend lines length and adjust the legend box, you can modify the following lines of code:

• Add the `'AutoUpdate','off'` property to the `legend` function to prevent it from automatically updating when the plot changes.

h_legend = legend([h_y1, h_y2], y1_legend_entry, y2_legend_entry, 'Location', 'NorthEast', 'Interpreter', 'latex', 'AutoUpdate', 'off');

• Adjust the `LineWidth` property of the legend lines to make them shorter. For example, you can set it to `0.5`:

set(h_legend, 'LineWidth', 0.5);

• Adjust the size of the legend box by modifying the `Position` property of the legend. You can experiment with different values to achieve the desired result. For example:

legend_position = get(h_legend, 'Position');
legend_position(3) = legend_position(3) * 0.8; % Reduce the width of the legend box by 20%
set(h_legend, 'Position', legend_position);