添加图例Matlab图 [英] add legend matlab plot

问题描述

我有一个matlab函数myfunction(var1,var2)，该函数为我提供了带有图例的图.我想在一张图中使用此函数生成更多图.到目前为止，这是有效的，即一张图中的2个图具有:

I have a matlab function myfunction(var1,var2) which gives me a plot with a legend. I would like to generate more plots with this function in one graph. This works so far i.e. for 2 plots in one graph with:

myfunction(a,b)
hold on
myfunction(c,d)
hold off

这里的问题是为每个图生成的图例具有:

The problem here is that the legend which is generated for each plot with:

legend(sprintf('%s%s',var1,' on ',var2))
legend('boxoff')

仅出现在myfunction的最后一个实例中(在本例中是myfunction(c,d)，在图例中只有一行显示'c on d'，但我想用' a on b'和'c on d')

is only appearing for the last instance of myfunction (in this case with myfunction(c,d), there would be only one line of legend where it says 'c on d', but I would like to have two lines with 'a on b' and 'c on d')

那么如何在不覆盖图例的情况下将其添加到图例中呢?

So how can I add something to the legend without overwriting it?

推荐答案

另一种可能性是使用

Another possibility is to use the dynamic legend (not so-well documented) feature of MATLAB. In your case, instead of passing the legend captions to the legend function, you'll need to use them as input arguments to the plot function:

plot(x, y, 'DisplayName', 'caption');

，然后使用以下语法添加图例:

and then add the legend using the following syntax:

lh = legend('-DynamicLegend');
set(lh, 'Box', 'off');

但是，如果您有大量图形要尽快绘制在同一图上，则我不建议采用这种方法，例如在一个循环中.在这些情况下，动态图例可能会严重影响性能.

However, I wouldn't suggest this approach if you have a large number of graphs to be rendered on the same plot as fast as possible, e.g. in a loop. In these cases the dynamic legend might cause a significant performance hit.

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