带有2个y轴和datetick的散点图 [英] Scatter with 2 y-axes and datetick

问题描述

我非常感谢您的帮助.

我要独立的数据集.每个数据集包含两个变量:日期(作为日期编号)和相应的数据.我需要在一个散点图中绘制两个数据集，在x轴上绘制日期，在两个y轴上绘制日期.我一直在尝试以下代码:

I have to independent datasets. Each dataset contains two variables: dates (as datenumber) and corresponding data. I need to plot both datasets on one scatter plot with dates on x-axis and two y-axes. I have been trying with the following code:

figure(1); 
scatter(x1,y1,'g'); 
set(gca); 
ax1=gca;
set(ax1,'YColor','g'); 
ax2 = axes('Position',get(gca,'Position'),'YAxisLocation','right', XTick'[],'Color','none','YColor','r'); 
hold on; scatter(x2,y2,'r');

现在，这在右侧给出了正确的y轴，但是在右侧，我最终得到了两个重叠的y轴. 另外，我需要更改x轴，以便它显示日期而不是日期数字.我试图将datetick合并到代码中，但这又给了我两个重叠的x轴.

Now, this gives correct y-axis on the right side, however on the right side I end up with two overlapping y-axes. Also, I need to change x-axis so that it displays dates as opposed to datenumbers. I've tried to incorporate datetick into the code but it again gives me two overlapping x-axes.

有人知道怎么做吗?

谢谢

推荐答案

我使用示例输入尝试了您的脚本，但没有发现问题.无论如何，这是一个使用matlab函数plotyy的解决方案，该函数适用于像这样的简单绘图:

I tried your script with your sample input and found no problems. Anyway, here's a solution which uses the matlab function plotyy, which is suited to simple plots like this:

%generate input
x1=[732490 732509 732512 732513 732521 732528];
y1=[7.828 7.609 22.422 14.758 26.258 1.477];
x2=[732402 732403 732404 732404 732433];
y2=[0.693 0.645 0.668 0.669 0.668];

figure(1); 
[ax, h1,h2]=plotyy(x1,y1,x2,y2,'scatter');

%set colors manually
green=[0 1 0];
red=[1 0 0];
set(h1,'cdata',green);
set(h2,'cdata',red);
set(ax(1),'ycolor',green);
set(ax(2),'ycolor',red);

%note the 'keepticks' and 'keeplimits' options
datetick(ax(1),'x','yyyy-mm-dd','keepticks','keeplimits');
datetick(ax(2),'x','yyyy-mm-dd','keepticks','keeplimits');

在没有datetick调用的情况下，plotyy函数将图形中的xtick同步.调用datetick时，它将重新计算滴答声，除非您明确指示不这样做，请参见选项keepticks，这被视为两组x轴(即使x坐标相同) ，刻度线位于不同的位置).需要keeplimits选项来保留原始的xlim.显然，需要更多的人工工作才能获得足够漂亮的图.

Without the datetick call the plotyy function synchronizes the xticks in the plot. When you call datetick, it recalculates the ticks, unless you explicitly tell it not to, see the option keepticks, and this is seen as two sets of x axes (even though the x coordinates are the same, the ticks are located at different positions). The keeplimits option is needed to preserve the original xlim. It obviously needs some more manual work to get plots like this sufficiently pretty.

还请注意，我是手动设置轴和数据颜色的:可能有一种更优雅的方法.

Also note that I set the axes and data colors manually: there might be a way to do this more elegantly.

更新:最初缺少keeplimits

Update2 :已更改示例数据以与更新的问题评论相对应

Update2: changed sample data to correspond to updated question comment

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