Is it possible to draw a bar plot with percentage lines?

Question

Helena 2019-9-12

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编辑： Adam Danz 2019-9-23

Hello!

I'm drawing a bar plot with data from a file, like this. The data is sorted into bars according to the exponent of each value in scientific notation. The code is shown below.

    data = sort(data);
    s = floor(log10(abs(data)));
    x = unique(s);
    y  = histc(s, x);
    figure('Name', file.name);
    bar(x, y);
    title(file.name, 'Interpreter', 'none');
    barvalues;

The plot generated is something like this:

I was looking for a way to draw percentages in the plot, something like this (the percentages are completely made up):

Do you know if this is possible and how it could be done? Thank you so much!

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Adam Danz 2019-9-12

What do you mean by "draw percentages"? What do those red lines represent?

Helena 2019-9-12

The red lines represent the percentage of each bar. I wanted the cumulative percentage, as shown in image. For instance, until -4 the total percentage is 1%, until -2 is %3... at 1 is 100%.

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Answer 1

the cyclist 2019-9-12

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I'm not sure if you are asking for them to be automatically positioned, but there are many options for drawing lines on a plot:

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Answer 2

Adam Danz 2019-9-12

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编辑：Adam Danz 2019-9-13

Use cumsum() to compute the cumulative sum of each bar height. Then you can normalize it to the max bar height (this is how I interpreted your query but if you need something different, please add details).

Here's a functional demo

y = [75 91 105 123.5 131 150 179 203 226 249 281.5];
h = bar(y); 
barcs = cumsum(h.YData);
% Normalize the cumsum to the max bar height
barcsNorm = barcs / barcs(end) .* h.YData; 
% Plot lines
hold on
ph = plot([h.XData;h.XData], [zeros(size(barcsNorm)); barcsNorm], 'r-', 'LineWidth', 3); 