![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/177614/image.png)
Less than what number in the file ht could give 95%?
1 view (last 30 days)
Show older comments
AbelM Kusemererwa
on 7 Jul 2015
Commented: Star Strider
on 8 Jul 2015
Attached is column vector ht . I would want to find out below what number in ht would constitute 95% of ht ? For example, numbers in ht that are less than 25 constitute 43.78% of ht.
0 Comments
Accepted Answer
Star Strider
on 7 Jul 2015
It took me a bit to understand what you wanted, but the result is actually straightforward:
D = load('ht.mat');
ht = D.ans;
ht95idx = fix(0.95*length(ht));
ht95 = ht(ht95idx)
figure(1)
plot(ht, '-r')
hold on
plot(ht95idx, ht95, 'bp')
hold off
grid
xlabel('index')
ylabel('ht')
text(ht95idx-150, ht95, sprintf('95%%‘ht’ at %5.1f \\rightarrow', ht95), 'HorizontalAlignment','right')
The plot of ‘ht’ as a function of its index:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/177614/image.png)
10 Comments
More Answers (2)
bio lim
on 7 Jul 2015
Edited: bio lim
on 7 Jul 2015
First of all, I think it is bad idea to save your variable as ' ans ', so you should define a unique name. (I have renamed ' ans ' to ' data ' in your ht.mat file.)
This might be a clumsy code but should do the trick.
load('ht.mat')
x = zeros(size(data)); % Create vector of zeros
for i = 1 : length(data)
x(i) = sum(data==data(i)); % Counting the number of occurance
end
z = [data x]; % Matrix with first column as your initial data, and second as the number of occurence.
h = unique(z, 'rows'); % Only unique elements are selected.
sum = cumsum(h(:,2)); % 95% of 23880 is 22686
g = [h sum];
Thus less than 34.7 could give you 95% (More precisely 95.017%) . Hope it helps.
0 Comments
Sean de Wolski
on 7 Jul 2015
Edited: Sean de Wolski
on 7 Jul 2015
x = rand(100,1);
xp = prctile(x,[0,95]); % 2nd element
plot(sort(x))
line([1 100],xp([2 2]))
title(['95% is ' num2str(xp(2))])
0 Comments
See Also
Categories
Find more on Get Started with MATLAB in Help Center and File Exchange
Products
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!