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

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University 2024-2-24

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2086298-how-to-add-a-legend-for-multiple-figures-with-horizontal-and-south-location

评论： Star Strider 2024-2-24

采纳的回答： Star Strider

data.mat

在 MATLAB Online 中打开

% 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';

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Answer 1

Star Strider 2024-2-24

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2086298-how-to-add-a-legend-for-multiple-figures-with-horizontal-and-south-location#answer_1415653

编辑：Star Strider 2024-2-24

在 MATLAB Online 中打开

data.mat

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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Star Strider 2024-2-24

My pleasure!

You did not request that, so I did not consider it.

You need to subscript ‘p1’ through ‘p4’ to have all of them appear in the legend, otherwise only the last will be saved and appear because each iteration over-writes the previous result in that instance.

Subscripting them (as I edited the code to do) will save all of them and present all of them in the legend, as it does now.

I am not certain what you want in the legend, so I present all ‘p1’ through ‘p4’ in it, and expanded it with:

lt = nexttile(5,[2 2]); % Use Row 3 For Legend Location

so that the entries are readable (otherwise they are squashed together). If you want to display fewer entries, you can certainly do that by limiting the entries presented to it (right now I use all of them).

The previus value for the legend tile was:

lt = nexttile(5,[1 2]); % Use Row 3 For Legend Location

so use that in the event you want to go back to it with fewer legend entries.

.

University 2024-2-24

Thank you for your explanation

Star Strider 2024-2-24

As always, my pleasure!

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

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