剧情外的图例不适用于Octave中的plotyy [英] Legend outside plot does not work with plotyy in Octave

问题描述

我正在尝试使用plotyy在Octave中创建图(在Windows上使用v4.4.1)，并将图例放在图外(因为数据覆盖了图内的所有可用空间).以下MVCE应该可以很好地重现该问题:

% Generate some random data to reproduce the issue
data = rand(1000,10);
data(:,1:8) = data(:,1:8)-0.5;
data(:,9:10) = data(:,9:10)+30;
timedate = linspace(737310,737313,size(data,1));
data_labels={'1';'2';'3';'4';'5';'6';'7';'8';'9';'10'};

% Plot the data
figure('Name','MVCE','Position',[300 200 1000 600])
[ax,h1,h2] = plotyy(timedate,data(:,1:8),timedate,data(:,9:10));
set(h2,'Visible','on'); 
datetick(ax(1),'x','HH:MM:SS')
datetick(ax(2),'x','HH:MM:SS')
ylim(ax(1),[-1 1])
ylim(ax(2),[20 50])
xlabel('Date & time')
ylabel(ax(1),'Something')
ylabel(ax(2),'Something else')
title('plotyy graph with legend problem')
[hl,hlo] = legend([h1;h2],data_labels,'location','eastoutside');
grid on

这是使用gnuplot图形工具包的代码输出:

如您所见，图例不会超出图的范围，并且第二个y轴不可见(看起来实际上是图的一部分被截断了).

我尝试使用qt和fltk图形工具包，它们提供了各自的问题:

1. 使用qt图形工具包

2. 使用fltk图形工具包

anoybody可以提出修复建议或至少解决方法吗?在MATLAB中是否也会发生相同的问题?还是特定于Octave的?

编辑 使用Tasos答案中的建议，我设法使其几乎可以与gnuplot一起使用:

% Plot the data
figure('Name','MVCE','Position',[300 200 1000 600])
[ax,h1,h2] = plotyy(timedate,data(:,1:8),timedate,data(:,9:10));
set(h2,'Visible','on'); 
datetick(ax(1),'x','HH:MM:SS')
datetick(ax(2),'x','HH:MM:SS')
ylim(ax(1),[-1 1])
ylim(ax(2),[20 50])

ax1Pos = get(ax(1), 'position');   
ax2Pos = get(ax(2), 'position');
ax1Pos(3) = ax1Pos(3) * 0.73;      
ax2Pos(3) = ax2Pos(3) * 0.73;
set(ax(1), 'position', ax2Pos);    
set(ax(2), 'position', ax2Pos);

xlabel('Date & time')
ylabel(ax(1),'Something')
ylabel(ax(2),'Something else')
title('plotyy graph with legend problem')
[hl,hlo] = legend([h1;h2],data_labels,'location','eastoutside');
pos = get(hl,'Position');
pos(1) = 0.9;
set(hl,'Position',pos)
grid on

哪个会产生:

除了图例上覆盖了第二个y轴标签(仅当打印到jpg时，它不在我的屏幕上)之外，问题在于Octave似乎在每个图例的顶部都绘制了两个图例另一个由于某种原因:一个带有第一组数据的数据附加在第一组轴上，另一个带有完整的数据组，两个轴都位于第一个图例的顶部.这显然是错误的，尝试将hl的Visible属性设置为off会删除两个图例，而不仅仅是一个图例.

解决方案

更新:处理图例位置和影响图形的OpenGL精度.

关于图例未正确显示在所需位置的问题，您可以手动调整图形中所有轴的位置，以将它们准确放置在所需位置.

关于OpenGL在将小数添加到大数时无法处理所涉及的精度问题，仅绘制涉及小数的图形，然后简单地调整xticklabel使其与所需的数字相对应. /p>

下面的完整代码:

% Generate some random data to reproduce the issue
data = rand(1000,10);
data(:,1:8) = data(:,1:8)-0.5;
data(:,9:10) = data(:,9:10)+30;
t_offset = 737310;
timedate = linspace(0,3,size(data,1));
data_labels={'1';'2';'3';'4';'5';'6';'7';'8';'9';'10'};

% Plot the data
figure('Name','MVCE','Position',[300 200 1000 600])
[ax,h1,h2] = plotyy(timedate,data(:,1:8),timedate,data(:,9:10));
set(h2,'Visible','on'); 
ylim(ax(1),[-1 1])
ylim(ax(2),[20 50])
ylabel(ax(1),'Something')
ylabel(ax(2),'Something else')
title('plotyy graph with legend problem')
[hl,hlo] = legend([h1;h2],data_labels,'location','eastoutside');
set(hl, 'position', get(hl, 'position') .* [0.975, 1, 0.975, 1] )
grid on

ax1Pos = get(ax(1), 'position');   ax2Pos = get(ax(2), 'position');
ax1Pos(3) = ax1Pos(3) * 0.95;      ax2Pos(3) = ax2Pos(3) * 0.95;
set(ax(1), 'position', ax2Pos);    set(ax(2), 'position', ax2Pos);
XTicks = get(ax(1), 'xtick');
set(ax(1), 'xticklabel', datestr(XTicks + t_offset, 'HH:MM:SS'))
xlabel('Date & time')
set(ax(2), 'xtick', []);

输出:

I am trying to create a plot in Octave (using v4.4.1 on Windows) using plotyy and putting the legend outside the plot (because the data covers all the usable space inside the graph). The following MVCE should reproduce the issue fairly well:

% Generate some random data to reproduce the issue
data = rand(1000,10);
data(:,1:8) = data(:,1:8)-0.5;
data(:,9:10) = data(:,9:10)+30;
timedate = linspace(737310,737313,size(data,1));
data_labels={'1';'2';'3';'4';'5';'6';'7';'8';'9';'10'};

% Plot the data
figure('Name','MVCE','Position',[300 200 1000 600])
[ax,h1,h2] = plotyy(timedate,data(:,1:8),timedate,data(:,9:10));
set(h2,'Visible','on'); 
datetick(ax(1),'x','HH:MM:SS')
datetick(ax(2),'x','HH:MM:SS')
ylim(ax(1),[-1 1])
ylim(ax(2),[20 50])
xlabel('Date & time')
ylabel(ax(1),'Something')
ylabel(ax(2),'Something else')
title('plotyy graph with legend problem')
[hl,hlo] = legend([h1;h2],data_labels,'location','eastoutside');
grid on

This the output of the code using the gnuplot graphics toolkit:

As you can see, the legend does not go outside the plot, and the second y axis is not visible (it looks like part of the plot is actually truncated).

I have tried using the qt and fltk graphics toolkits, which give issues of their own:

1. With qt graphics toolkit

2. With fltk graphics toolkit

Can anoybody suggest a fix or at least workaround? Does the same issue also happen in MATLAB or is it Octave-specific?

EDIT Using the suggestion in Tasos' answer, I managed to almost make it work with gnuplot:

% Plot the data
figure('Name','MVCE','Position',[300 200 1000 600])
[ax,h1,h2] = plotyy(timedate,data(:,1:8),timedate,data(:,9:10));
set(h2,'Visible','on'); 
datetick(ax(1),'x','HH:MM:SS')
datetick(ax(2),'x','HH:MM:SS')
ylim(ax(1),[-1 1])
ylim(ax(2),[20 50])

ax1Pos = get(ax(1), 'position');   
ax2Pos = get(ax(2), 'position');
ax1Pos(3) = ax1Pos(3) * 0.73;      
ax2Pos(3) = ax2Pos(3) * 0.73;
set(ax(1), 'position', ax2Pos);    
set(ax(2), 'position', ax2Pos);

xlabel('Date & time')
ylabel(ax(1),'Something')
ylabel(ax(2),'Something else')
title('plotyy graph with legend problem')
[hl,hlo] = legend([h1;h2],data_labels,'location','eastoutside');
pos = get(hl,'Position');
pos(1) = 0.9;
set(hl,'Position',pos)
grid on

Which produces:

Apart from the fact that the legend overlays with the second y axis label (which it doesn't on my screen, only when printing to jpg), the problem is that Octave appears to plot two legends on top of each other for some reason: one with the first set of data attached to the first set of axes, and one with the complete set of data, for both axes right on top of the first legend. This is obviously wrong, and trying to set the Visible property of hl to off deletes both legends, not just the one.

解决方案

UPDATED: deals with both legend placement and OpenGL precision affecting graph.

Regarding the problem of the legend not appearing exactly in the position you want it to, you can manually adjust the position of all axes involved in a figure, to place them exactly where you want.

Regarding the problem of OpenGL being unable to deal with the precision involved when adding small numbers to a large number, plot the graph with only the small numbers involved, and then simply adjust the xticklabels to correspond to the numbers you desire.

Full code below:

% Generate some random data to reproduce the issue
data = rand(1000,10);
data(:,1:8) = data(:,1:8)-0.5;
data(:,9:10) = data(:,9:10)+30;
t_offset = 737310;
timedate = linspace(0,3,size(data,1));
data_labels={'1';'2';'3';'4';'5';'6';'7';'8';'9';'10'};

% Plot the data
figure('Name','MVCE','Position',[300 200 1000 600])
[ax,h1,h2] = plotyy(timedate,data(:,1:8),timedate,data(:,9:10));
set(h2,'Visible','on'); 
ylim(ax(1),[-1 1])
ylim(ax(2),[20 50])
ylabel(ax(1),'Something')
ylabel(ax(2),'Something else')
title('plotyy graph with legend problem')
[hl,hlo] = legend([h1;h2],data_labels,'location','eastoutside');
set(hl, 'position', get(hl, 'position') .* [0.975, 1, 0.975, 1] )
grid on

ax1Pos = get(ax(1), 'position');   ax2Pos = get(ax(2), 'position');
ax1Pos(3) = ax1Pos(3) * 0.95;      ax2Pos(3) = ax2Pos(3) * 0.95;
set(ax(1), 'position', ax2Pos);    set(ax(2), 'position', ax2Pos);
XTicks = get(ax(1), 'xtick');
set(ax(1), 'xticklabel', datestr(XTicks + t_offset, 'HH:MM:SS'))
xlabel('Date & time')
set(ax(2), 'xtick', []);

Output:

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