Labeling data points in plotyy

Question

Mark 2012-2-27

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/30459-labeling-data-points-in-plotyy

I need to plot two bar series in different scales and thus I am using the plotyy function as in the example below. I'm trying to show the values of the data points I plot with the bar function. The issue is that the labels I draw are not very well positioned for the series in the second axis (please see the example)

My question is: How can I make the text function correctly draw the text for the data points of the series in the right axis?

Thanks in advance

Just in case, I cannot put the first series in the second axes, and the second series in the first axes, the solution needs not to depend on such an order.

%%%%%%%%%%%%%%%%%
x = 15; 
y = {rand(x, 1) * 100; (-0:(0.8)/(x-1):0.8)'};
fn1 = @(x, y) bar(x, y, 0.3, 'FaceColor', 'blue');
fn2 = @(x, y) bar(x, y, 0.3, 'FaceColor', 'red'); 
figure; 
[ax, hbar1, hbar2] = plotyy( [1:x]-1, y{1}, [1:x]+1, y{2}, fn1, fn2);
hbars = [hbar1, hbar2];
angle = 67.5;
for i=1:length(hbars)
    hbar = hbars(i);
    x = get(get(hbar,'children'), 'xdata');
      rot = angle;
      while rot>360, rot=rot-360; end
      while rot<0, rot=rot+360; end
      if rot>=180, strDir='right'; else, strDir='left'; end
      caDataLabels = strread(sprintf('   %.3g\n', y{i}), '%s', 'delimiter', sprintf('\n'), 'whitespace', '');
      th=text(mean(x,1)', y{i}, caDataLabels, 'HorizontalAlignment', strDir, 'rotation', rot, 'FontSize', 8, 'VerticalAlignment', 'middle');
  end

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Answer 1

Jiro Doke 2012-2-27

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/30459-labeling-data-points-in-plotyy#answer_38933

在 MATLAB Online 中打开

You can specify the axes in which to place the text. For example, specify ax(2) for the right axes.

Notice below, I specified the Parent property for the text command. Also, to distinguish the labels, I specified the colors.

clr = {'blue', 'red'};
x = 15;
y = {rand(x, 1) * 100; (-0:(0.8)/(x-1):0.8)'};
fn1 = @(x, y) bar(x, y, 0.3, 'FaceColor', clr{1});
fn2 = @(x, y) bar(x, y, 0.3, 'FaceColor', clr{2});
figure;
[ax, hbar1, hbar2] = plotyy( [1:x]-1, y{1}, [1:x]+1, y{2}, fn1, fn2);
hbars = [hbar1, hbar2];
angle = 67.5;
for i=1:length(hbars)
    hbar = hbars(i);
    x = get(get(hbar,'children'), 'xdata');
    rot = angle;
    while rot>360, rot=rot-360; end
    while rot<0, rot=rot+360; end
    if rot>=180, strDir='right'; else, strDir='left'; end
    caDataLabels = strread(sprintf('   %.3g\n', y{i}), '%s', ...
        'delimiter', sprintf('\n'), 'whitespace', '');
    th=text(mean(x,1)', y{i}, caDataLabels, 'Parent', ax(i), ...
        'Color', clr{i}, 'HorizontalAlignment', strDir, ...
        'rotation', rot, 'FontSize', 8, 'VerticalAlignment', 'middle');
end

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Mark 2012-2-27

Thank you. It works.

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Answer 2

Mark 2012-2-27

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/30459-labeling-data-points-in-plotyy#answer_38936

在 MATLAB Online 中打开

For reference, here's another solution I just found:

%%Set the current axes
set(gcf(), 'CurrentAxes', ax(i)); 
%%Draw the text
th=text(mean(x,1)', y{i}, caDataLabels, 'HorizontalAlignment', strDir, 'rotation', rot, 'FontSize', 8, 'VerticalAlignment', 'middle');