Common legend for each row of tiled layout

Question

Delyle Polet 2023-11-29

1
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2053617-common-legend-for-each-row-of-tiled-layout

评论： Delyle Polet 2023-11-29

I am trying to make a compact tiled layout with N rows and 2 columns where the axes of each row share a common legend in MATLAB R2023b. The legend should be positioned above and in between the two axes in each row. I have attempted to do this by adding a legend to one tile in a row, and then repositioning it. However, this changes the size of the axes and causes the legend to overlap the axes

Here's a MWE:

%% Generate the tiled layout and legends
tlh = tiledlayout(2,2,'TileSpacing','Compact');
% Tile 1
nexttile
plot(rand(20,2))
% Tile 2
nexttile
plot(rand(20,2))
lh = legend('sample 1','sample 2');
% Tile 3
nexttile
plot(rand(20,2))
% Tile 4
nexttile
plot(rand(20,2))
lh(2) = legend('sample 3','sample 4');
% Adjust Legend parameters
[lh.Location] = deal('NorthOutside');
[lh.Orientation] = deal('horizontal');
[lh.Units] = deal('normalized');

This looks ok, with nicely-sized plots, but we want the legends to be in the centre.

%% Reposition the legends

for i = 1:length(lh)

lw = lh(i).Position(3);

lh(i).Position(1) = 0.5-lw/2;

end

This makes the legends overlap the axes.

What to do? I can't use the "Layout" options in the legend handle as far as I know; that would only let me place on axis above the figure. I can't change the position of the axes, as these cannot be set manually in a TileChartLayout.

I could do nested tiled layouts, but that seems very cumbersome, especially when I have many more rows.

Thank you