Matlab更新具有多个数据线/曲线的图 [英] Matlab update plot with multiple data lines/curves

问题描述

我想尽快更新具有多个数据线/曲线的图.我已经看到了一些使用以下方法来更新情节的方法:

I want to update a plot with multiple data lines/curves as fast as possible. I have seen some method for updating the plot like using:

h = plot(x,y);
set(h,'YDataSource','y')
set(h,'XDataSource','x')
refreshdata(h,'caller');

或

set(h,'XData',x,'YData',y);

对于一条曲线来说，效果很好，但是我不仅要更新一条曲线，还要更新多条数据曲线.我该怎么办?

For a single curve it works great, however I want to update not only one but multiple data curves. How can I do this?

推荐答案

如果使用单个plot命令创建多个绘图对象，则plot返回的句柄实际上是

If you create multiple plot objects with a single plot command, the handle returned by plot is actually an array of plot objects (one for each plot).

plots = plot(rand(2));
size(plots)

    1   2

因此，您不能只是将另一个[2x2]矩阵分配给XData.

Because of this, you cannot simply assign another [2x2] matrix to the XData.

set(plots, 'XData', rand(2))

您可以通过以下语法将新XData的单元格数组传递给绘图.只有在单元格数组中已经有新值的情况下，这才真正方便.

You could pass a cell array of new XData to the plots via the following syntax. This is only really convenient if you already have your new values in a cell array.

set(plots, {'XData'}, {rand(1,2); rand(1,2)})

其他选项是使用新值分别更新每个图对象.就快速执行而言，立即设置所有设置并不会对性能造成太大影响，因为直到MATLAB空闲或您显式调用drawnow时，它们才会真正呈现出来.

The other options is to update each plot object individually with the new values. As far as doing this quickly, there really isn't much of a performance hit by not setting them all at once, because they will not actually be rendered until MATLAB is idle or you explicitly call drawnow.

X = rand(2);
Y = rand(2);

for k = 1:numel(plots)
    set(plots(k), 'XData', X(k,:), 'YData', Y(k,:))
end

% Force the rendering *after* you update all data
drawnow

如果您确实要使用已显示的XDataSource和YDataSource方法，则可以执行此操作，但是您需要为每个绘图对象指定唯一的数据源.

If you really want to use the XDataSource and YDataSource method that you have shown, you can actually do this, but you would need to specify a unique data source for each plot object.

% Do this when you create the plots
for k = 1:numel(plots)
    set(plots(k), 'XDataSource', sprintf('X(%d,:)', k), ...
                  'YDataSource', sprintf('Y(%d,:)', k))
end

% Now update the plot data
X = rand(2);
Y = rand(2);

refreshdata(plots)

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