first time use Histogram, need help

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Xiao yang
Xiao yang 2024-9-5
编辑： Adam Danz 2024-9-6
need help
  2 个评论
the cyclist
the cyclist 2024-9-5
You say you need help, but you don't really say what help you need.
  • Describe what you are trying to do, in more detail.
  • Share any code you have written yourself.
  • What input data do you have? Can you share the data here (by uploading a MAT file with the data)?
Xiao yang
Xiao yang 2024-9-5
input data from Density - Frequency table, which I photo from my text book, need help how for to plot Histograh.

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回答（2 个）

Adam Danz
Adam Danz 2024-9-6
编辑：Adam Danz 2024-9-6
Ran in:
In MATLAB, I recommend using the histogram function.
histogram('Categories',Categories,'BinCounts',counts)
x = reshape([0.29:0.01:0.4], 2, []);
xlabels = compose('%.2f-%.2f', x.');
y = [30 75 32 9 3 1];
figure
histogram('Categories',categorical(xlabels), 'BinCounts', y, 'FaceColor', 'red')
ylabel('Frequency')
xlabel('Density')
Note that the x-values are not continuous. For example, there are no data between x=0.30 and x=0.31. This is why the ranges are plotted as categories.
Star Strider
Star Strider 2024-9-5
编辑：Star Strider 2024-9-5
Ran in:
The histogram has already been created.
Use the bar function to plot it —
x = reshape([0.29:0.01:0.4], 2, []);
y = [30 75 32 9 3 1];
figure
hb = bar(mean(x), y, 'hist');
hb.FaceColor = 'r';
Ax = gca;
Ax.XTick = mean(x);
Ax.XTickLabel = compose('%.2f-%.2f', x.');
pos = Ax.Position;
xl = xlim;
yl = ylim;
xapf = @(x,pos,xl) pos(3)*(x-min(xl))/diff(xl)+pos(1); % 'x' Annotation Position Function
yapf = @(y,pos,yl) pos(4)*(y-min(yl))/diff(yl)+pos(2); % 'y' Annotation Position Function
annotation('textarrow',xapf([0.395 0.395],pos,xlim), yapf([40 5],pos,ylim), 'String',["Less than 1%" "of samples near the" "undesirable 0.40 level"])
xlabel('Denisty')
ylabel('Frequency')
title('Histogram of Density Data')
EDIT — Added annotation object.
.
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Star Strider
Star Strider 2024-9-5
@Xiao yang — My pleasure. You have to have the original data to use any histogram function.
I have no experience with R, and I never heard of JMP.
@Walter Roberson — Thank you!
Image Analyst
Image Analyst 2024-9-6
"teacher want students use R or JMP to plot this Histogram" <== then do so. It's what your teacher wants -- to use R or JMP rather than MATLAB. Your teacher did not say "Ask others to solve the problem for you so you can turn their code in."
This looks like a homework problem. If you have any questions ask your instructor or read the link below to get started:
How do I get help on homework questions on MATLAB Answers? - MATLAB Answers - MATLAB Central
Obviously, if it is homework, we can't give you the full solution because you're not allowed to turn in our code as your own. No offense -- we just don't want you to get into trouble with your teacher.

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