动态图例(每次递归更新) [英] Dynamic Legend (Updates in every recursion)

问题描述

我得到了for i=1:15.在内部，我生成了一个变量d=1:0.01:10，它是x'x轴，基于此，我创建了一个连续函数F(d)，该函数具有2个唯一的螺距和偏航变量.然后，在每个使用cmap = hsv(15);的递归中，使用不同的颜色对此进行绘制.就是这样:

I got a for i=1:15. Inside I generate a variable d=1:0.01:10, which is the x'x axis and based on this, I create a continuous function F(d) which has 2 unique variables pitch and yaw. I then plot this using different colors in every recursion using cmap = hsv(15);. So then it is:

d=1:0.01:10;
cmap = hsv(15);

for i=1:15
    pitch = unidrnd(10);
    yaw   = unidrnd(10);

    for j=1:length(d)
        F(j) = d(j)*3*pitch*yaw; %// some long calculation here
    end

    p1 = plot(d,F,'Linewidth', 1.0);
    title ('blah blah')
    set(p1, 'Color', cmap(i,:));
    hold on;
    legend (['pitch,yaw:', num2str(pitch) num2str(yaw)]) 
end 
hold off;

此代码在每次递归中都更新了唯一的俯仰，偏航值(它们之间没有空格，因此有点恼人)，但未能:

This code updates the unique pitch, yaw values in every recursion (without space between them so it is kind irritating) but fails to:

1. 应用适当的颜色(在图中可见).
2. 保留上一次迭代的颜色和pitch,yaw的值.

1. Apply the proper color, visible in the figure.
2. Hold the color from the previous iteration and the values of pitch,yaw.

推荐答案

半文档解决方案

通过动态图例"可以在循环中向图例添加行，如undocumentedmatlab.com上所述.

想法是将legend命令替换为:

legend('-DynamicLegend');

然后使用DisplayName参数更新plot命令:

Then update the plot command with a DisplayName parameter:

plot(d,F,'Linewidth',1.0,'DisplayName',sprintf('pitch,yaw: %d,%d',pitch,yaw));

plot(d,F,'Linewidth',1.0,'DisplayName',sprintf('pitch,yaw: %d,%d',pitch,yaw));

然后将添加到轴的图添加到图例:

Then plots that are added to the axes get added to the legend:

如果半文档记录的功能不是您的最佳选择，请使用DisplayName技巧，只需打开/关闭legend.也就是说，代替-DynamicLegend:

If semi-documented features are not your cup of tea, use the DisplayName trick and simply toggle the legend off/on. That is, instead of -DynamicLegend:

legend('off'); legend('show');

不使用DisplayName或-DynamicLegend 的不同变体是使用以下命令删除并重新创建图例存储的字符串数组.

A different variation that does not use either DisplayName or -DynamicLegend is to delete and recreate the legend with an array of stored strings.

MathWorks推荐的官方解决方案，因此它可以抓住现有图例的线手柄，并使用这些手柄手动更新图例.与上面的动态图例解决方案相比，这非常痛苦:

The official solution recommended by MathWorks it so grab the existing legends` line handles and manually update the legend with those handles. This is pretty painful by comparison to the dynamic legend solution above:

% Get object handles
[LEGH,OBJH,OUTH,OUTM] = legend;

% Add object with new handle and new legend string to legend
legend([OUTH;p1],OUTM{:},sprintf('pitch,yaw: %d,%d',pitch,yaw))

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