How to add a legend for multiple figures with horizontal and south location

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% Please how can add one legends for the subplots. I want the legend
% location to south and horizontal. I also want to break the legend into
% two lines.
% load
mydata = load('data.mat')
mydata = struct with fields:
nt: 101 paras: [1×1 struct] t: [0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 … ] (1×101 double) thetazt: [101×201×2 double] vzt: [101×201×2 double] xivals: [-0.2000 0.2000] z: [0 1.0000e-06 2.0000e-06 3.0000e-06 4.0000e-06 5.0000e-06 6.0000e-06 7.0000e-06 8.0000e-06 9.0000e-06 1.0000e-05 1.1000e-05 1.2000e-05 1.3000e-05 1.4000e-05 … ] (1×201 double) zm: 101
xivals = mydata.xivals
xivals = 1×2
-0.2000 0.2000
pars = mydata.paras;
% u value
u = pars.u;
z = mydata.z;
t = mydata.t;
nt = mydata.nt;
% theta and v
thetazt = mydata.thetazt;
vzt = mydata.vzt;
%% Plot
fig1 = figure(1);
T = tiledlayout(2,2, 'TileSpacing', 'compact');
tinds=[2, 4, 6, 11, 16, 21, 26];
nit=length(tinds);
nexttile(T)
hold on
for it=1:length(tinds)
xi_part = "\xi = " + xivals(1);
t_part = ", t = " + t(tinds(it));
dn1 = xi_part + t_part;
p1 = plot(z, thetazt(tinds(it), :, 1), 'Color',[1-(it-1)/(nit-1),(it-1)/(nit-1),1], 'DisplayName', dn1);
end
nexttile(T)
hold on
for it=1:length(tinds)
xi_part = "\xi = " + xivals(1);
t_part = ", t = " + t(tinds(it));
dn1 = xi_part + t_part;
p2 = plot(z, thetazt(tinds(it), :, 2), 'Color',[1-(it-1)/(nit-1),(it-1)/(nit-1),1], 'DisplayName', dn1);
end
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
nexttile(T)
hold on
for it=1:length(tinds)
xi_part = "\xi = " + xivals(1);
t_part = ", t = " + t(tinds(it));
dn1 = xi_part + t_part;
p3 = plot(z, vzt(tinds(it), :, 1), 'Color',[1-(it-1)/(nit-1),(it-1)/(nit-1),1], 'DisplayName', dn1 );
end
nexttile(T)
hold on
for it=1:length(tinds)
xi_part = "\xi = " + xivals(1);
t_part = ", t = " + t(tinds(it));
dn1 = xi_part + t_part;
p4 = plot(z, vzt(tinds(it), :, 2), 'Color',[1-(it-1)/(nit-1),(it-1)/(nit-1),1], 'DisplayName', dn1);
end
% Create a Legend with the data from multiple axes
lg = legend([p1,p2,p3,p4]);
lg.Location = 'south';
lg.Orientation='horizontal';

Accepted Answer

Star Strider
Star Strider on 24 Feb 2024
Edited: Star Strider on 24 Feb 2024
I am not certain what you want.
Try this —
% Please how can add one legends for the subplots. I want the legend
% location to south and horizontal. I also want to break the legend into
% two lines.
% load
mydata = load('data.mat')
mydata = struct with fields:
nt: 101 paras: [1x1 struct] t: [0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 ... ] (1x101 double) thetazt: [101x201x2 double] vzt: [101x201x2 double] xivals: [-0.2000 0.2000] z: [0 1.0000e-06 2.0000e-06 3.0000e-06 4.0000e-06 5.0000e-06 6.0000e-06 7.0000e-06 8.0000e-06 9.0000e-06 1.0000e-05 1.1000e-05 1.2000e-05 1.3000e-05 ... ] (1x201 double) zm: 101
xivals = mydata.xivals
xivals = 1x2
-0.2000 0.2000
pars = mydata.paras;
% u value
u = pars.u;
z = mydata.z;
t = mydata.t;
nt = mydata.nt;
% theta and v
thetazt = mydata.thetazt;
vzt = mydata.vzt;
%% Plot
fig1 = figure(1);
T = tiledlayout(4,2, 'TileSpacing', 'compact'); % Change To Specify 3 Rows
tinds=[2, 4, 6, 11, 16, 21, 26];
nit=length(tinds);
nexttile(T)
hold on
for it=1:length(tinds)
xi_part = "\xi = " + xivals(1);
t_part = ", t = " + t(tinds(it));
dn1 = xi_part + t_part;
p1(it) = plot(z, thetazt(tinds(it), :, 1), 'Color',[1-(it-1)/(nit-1),(it-1)/(nit-1),1], 'DisplayName', dn1);
end
nexttile(T)
hold on
for it=1:length(tinds)
xi_part = "\xi = " + xivals(1);
t_part = ", t = " + t(tinds(it));
dn1 = xi_part + t_part;
p2(it) = plot(z, thetazt(tinds(it), :, 2), 'Color',[1-(it-1)/(nit-1),(it-1)/(nit-1),1], 'DisplayName', dn1);
end
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
nexttile(T)
hold on
for it=1:length(tinds)
xi_part = "\xi = " + xivals(1);
t_part = ", t = " + t(tinds(it));
dn1 = xi_part + t_part;
p3(it) = plot(z, vzt(tinds(it), :, 1), 'Color',[1-(it-1)/(nit-1),(it-1)/(nit-1),1], 'DisplayName', dn1 );
end
nexttile(T)
hold on
for it=1:length(tinds)
xi_part = "\xi = " + xivals(1);
t_part = ", t = " + t(tinds(it));
dn1 = xi_part + t_part;
p4(it) = plot(z, vzt(tinds(it), :, 2), 'Color',[1-(it-1)/(nit-1),(it-1)/(nit-1),1], 'DisplayName', dn1);
end
lt = nexttile(5,[2 2]); % Use Row 3 For Legend Location
% get(lt)
% Create a Legend with the data from multiple axes
lg = legend([p1,p2,p3,p4]);
lg.Location = 'south';
lg.Orientation='vertical';
lg.Position = lt.Position;
lg.NumColumns = 2;
lt.Visible = 'off';
EDIT — (24 Feb 2024 at 17:25)
Subscripted ‘p1’ ... ‘p4’ so that they now all appear in the legend, as requested in the Comment.
.
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