how to make intervals in a bar graph

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Suppose I have some people and they are of different weight, e.g.
weight in Kq: 40-45 45-50 50-55 55-60 60-65
No. of Persons: 4 12 13 6 5
I want to represent the weight on x-axis and No. of persons on y-axis. This will tell us that there are 4 persons whose weight lies within 40-45 and 12 persons whose weight lies in the interval 45-50 kilo and so on. How can we do that?

回答(2 个)

Adam Danz
Adam Danz 2020-10-21
编辑:Adam Danz 2020-10-21
For continuous intervals
Since your intervals are continuous, you should be using histogram() instead of bar().
kg = 40:5:65;
n = [4 12 13 6 5];
histogram('BinEdges',kg,'BinCounts',n)
xlabel('Weight (kg)')
ylabel('Number of participants')
For discountinuous or categorical intervals
For any future visitors who are not using continuous x-bins and want to label bin edges, follow this demo.
% Create data
bins = [10 20;
50 60;
75 85];
y = [20;10;30];
% Create bar plot
% The .5 specifies bin width, making room for labels
h = bar(y, .5);
% Get bar centers and bar widths
xCnt = h.XData + h.XOffset; % XOffset is undocumented!
width = h.BarWidth;
% Get x-val of bar-edges
barEdgesX = xCnt + width.*[-.5;.5];
% Set new xtick and xticklabels, rotate by 90deg.
ax = h.Parent; % axis handle, if you don't have it already
ax.XTick = barEdgesX(:);
ax.XTickLabel = string(reshape(bins',[],1));
ax.XTickLabelRotation = 90;
  2 个评论
the cyclist
the cyclist 2020-10-21
For "discontinuous" bins, it might be simpler to use your original syntax, but with a zero bin count for empty bins.
For example,
kg = 40:5:75;
n = [4 0 12 13 0 6 5];
figure
histogram('BinEdges',kg,'BinCounts',n)
xlabel('Weight (kg)')
ylabel('Number of participants')
Adam Danz
Adam Danz 2020-10-21
Oh, that's interesting!
Thanks for the idea, the cyclist.
I just tested it with NaNs as spacers too but histogram throws an error that N must be finite.

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the cyclist
the cyclist 2020-10-21
编辑:the cyclist 2020-10-21
Here is one way:
w = 42.5 : 5.0 : 62.5;
n = [4 12 13 6 5];
bar(w,n,'BarWidth',1)
FYI, if you have the underlying individual weight data, rather than the bin counts, you will definitely want to use histogram as in Adam's solution (although the syntax will be different).
  23 个评论
Sadiq Akbar
Sadiq Akbar 2020-10-22
Thank you very much dear Adam Danz.Yes you are right that my 1st data of Kg was different than this one. Its becuase I posted this data with the question that what will be the histogram/bar plot for this, but no one did an attempt on that. Then I thought may be I am not able to make some one understand my problem. So I changed my question in the type which is understandable to all and therefore, I posted here as KG and n. And you and the cyclist attempted it.
Sadiq Akbar
Sadiq Akbar 2020-10-23
I found one such code on this site today. The code is as follows:
[~,edges] = histcounts(log10(x));
histogram(x,10.^edges)
set(gca, 'xscale','log')
In this code, when I replace x by my data, then it plots well. Now I want to insert a preview in this graph. How can I insert the same graph as a preview pane in the same figure window as is in the attachment figure.

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