How to label legend of plot

Below is (part of) a code that generates two ellipses on one plot.

My question is: how can I use the legend function to label each ellipse as "MTE1" and "source report". Note, the two plot functions listed each plot one ellipse on the same plot.

%% Plot MTE1:

[a_squared,b_squared,OA] = matrix_to_ellipse_squared(q11,q12,q22);

a = sqrt(a_squared)*2.5;

b = sqrt(b_squared)*2.5;

% Calculate X&Y parameters with MTE1 as center:

[X, Y, x_mtf, y_mtf] = calculate_location_and_errorXY(LAT_MTE1,LON_MTE1,EL_MTE1,...

LAT_MTE1,LON_MTE1,EL_MTE1,a,b,OA);

% Plot

plot(X,Y,'k*', x_mtf, y_mtf, 'k-')

hold on

%% Plot Source Report

[a_squared,b_squared,OA] = matrix_to_ellipse_squared(p11,p12,p22);

a = sqrt(a_squared)*2.5;

b = sqrt(b_squared)*2.5;

[X, Y, x_source, y_source] = calculate_location_and_errorXY(LAT_SR,LON_SR,EL_SR,...

LAT_MTE1,LON_MTE1,EL_MTE1,a,b,OA);

plot(X,Y,'b*', x_source, y_source, 'b-')

hold on

%% This following part really really helps if you want to zoom, but otherwise comment

axis([-2500 1500 -2500 1500])

legend() %%% how to place inputs in legend

xlabel('feet')

ylabel('feet')

plotErrorEllipses = 1;

Answer 1

[Voss]

Something like this should work (using random data and using the second line from each plot call in the legend - adjust as necessary):

% random data
X = rand(1,10);
Y = rand(1,10);
x_mtf = rand(1,10);
y_mtf = rand(1,10);

% Get the line handles returned from plot()
h_mtf = plot(X,Y,'k*', x_mtf, y_mtf, 'k-')

h_mtf = 
  2×1 Line array:

  Line
  Line

hold on

% random data
X = rand(1,10);
Y = rand(1,10);
x_source = rand(1,10);
y_source = rand(1,10);

% Get the line handles returned from plot()
h_source = plot(X,Y,'b*', x_source, y_source, 'b-')

h_source = 
  2×1 Line array:

  Line
  Line

hold on

% give legend() only the lines you want to use in the legend,
% along with their names:
legend([h_mtf(2) h_source(2)],{'MTE1' 'source report'})

[N/A]

Awesome. Works great! I appreciate your time greatly.

Kind Regards,

Matthew

[Voss]

You're welcome!