Update multiple plot fills using XData and YData

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Jeremy 2018-1-29

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https://ww2.mathworks.cn/matlabcentral/answers/379641-update-multiple-plot-fills-using-xdata-and-ydata

评论： Walter Roberson 2018-1-30

I was doing the following to generate n filled areas on a graph between n pairs of upper and lower curves.

 for i = 1:n
     x = % x values, function of i
     y1 = % upper curve, function of i
     y2 = % lower curve, function i
     fill([x fliplr(x)], [y2 fliplr(y1)]);
     hold on
 end

However, I need to be able to plot an empty fill, and then add the fills in a loop using XData and YData, like this (I know the following won't work, but schematically)

 h = fill(nan, nan, 'r');
 for i = 1:n
     x = % x values, function of i
     y1 = % upper curve, function of i
     y2 = % lower curve, function i
     h(i).XData = [x fliplr(x)]
     h(i).YData = [y2 fliplr(y1)]
 end

What's the proper way to do this? My need for this stems from using scrollplots, which doesn't work well with re-plotting the data, but instead you need to update the data of the existing plot if changes are made. Any ideas?

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Jan 2018-1-29

It is not clear, what you want to do. What is "an empty fill"? "Doesn't work well" is no clear description of the problem you have.

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Answer 1

Jan 2018-1-29

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https://ww2.mathworks.cn/matlabcentral/answers/379641-update-multiple-plot-fills-using-xdata-and-ydata#answer_302408

编辑：Jan 2018-1-29

[EDITED] Sorry, I've posted some nonsense code here by accident. Thanks, Walter. I do not remove the answer to keep the valuable comments.

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Jeremy 2018-1-29

在 MATLAB Online 中打开

Imagine the following scenario:

 h1 = plot(data1);
 h2 = scatter(data2);
 h3 = fill(data3);
 scrollplot;

scrollplot will then draw a small, scrollable window under the main plot area that will let you pan and zoom through a plot. But if you change the data and try and re-plot it, as I want to through edit boxes, the changes will get reflected in the mini-scrollable window, not the main plot window itself. Essentially any plot command run after you invoke scrollplot will only plot those changes in the scrollplot window, not the main plot window.

To get around this, you update the data set. So for the scatter plot, I can plot an empty set of data (since the input from the user in the edit box hasn't been entered yet)

 p2 = scatter(nan, nan);
 scrollplot;

And then in a callback connected to an edit box, I do

 p2.XData = newXdata;
 p2.YData = newYdata;

And this works great. But I don't know how to make this work with the fill area portion of the plot. I can do it with a single fill area like

p3 = fill(nan, nan);

And then in a callback

 p3.XData = [x fliplr(x)]
 p3.YData = [y2 fliplr(y1)]

And this works great. But my first code block in the original post creates n filled areas, and I need to replace them all (in a loop) with new data like above when the user changes input data.

Jeremy 2018-1-30

在 MATLAB Online 中打开

I also tried (with just 3 entries)

 (this works)
 p3 = [fill(nan, nan, 'r') fill(nan, nan, 'r') fill(nan, nan, 'r')

and

 (this doesn't)
 p3(1, 1:3) = fill(nan, nan, 'r')

Replacing the x & y data of both attempts in a loop with

 p3(1, i).XData = [x fliplr(x)];
 p3(1, i).YData = [y2 fliplr(y1)];

Any reason why those two behave differently?

Walter Roberson 2018-1-30

在 MATLAB Online 中打开

p3(1, 1:3) = fill(nan, nan, 'r') would assign the same patch handle to those elements.

The easiest fix is to loop. But you could use an implicit loop such as

arrayfun(@(~) fill(nan,nan), 1:3)

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Update multiple plot fills using XData and YData

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