Clear Filters
Clear Filters

How to use calculate the several means of same class

3 views (last 30 days)
Hello.
I have a data (90 x 2857), column 2857 is a label(class).
I'm using table function.
I want to read rows of the same class from table, select N rows, calculate the average.
Could you giva an idea to make the code?
data = readtable("outfile.csv");
data.Properties.VariableNames{end} = 'label';
data{:,1:end-1} = normalize(data{:,1:end-1},1); % I belive this should be "1"
data = sortrows(data,'label'); % The data are sorted by the lables
  1 Comment
Kong
Kong on 6 Apr 2020
I did't find how to select rows for same class randomly.
Can I get some ideas to make a code?

Sign in to comment.

Accepted Answer

Ameer Hamza
Ameer Hamza on 2 Apr 2020
Edited: Ameer Hamza on 2 Apr 2020
Try this
data = csvread('outfile.csv');
values = data(:,1:end-1);
labels = data(:,end);
avg = splitapply(@(x) mean(x,1), values, labels+1);
The avg matrix is 10x2856, each row corresponds to mean value of one class.
  7 Comments
Ameer Hamza
Ameer Hamza on 3 Apr 2020
@Kong, your question is not clear. Do you want to apply softmax function to all the distance values
data = csvread('outfile.csv');
values = data(:,1:end-1);
labels = data(:,end);
avg = splitapply(@(x) {mean(x,1)}, values, labels+1);
grps = splitapply(@(x) {x}, values, labels+1);
Distance = cellfun(@(x,y) {pdist2(x,y)}, grps, avg);
dlY = cellfun(@(x) {softmax(x)}, Distance);
Kong
Kong on 4 Apr 2020
Thank you so much.
I want to select 5 rows of the same classes randomly and compute the mean of each 5 rows.
(10 Combination 5)
So I want to get all possible combinations' average values of the same classes.
In this code, I computed all rows of the same class and got one average value.
Could you explain how to fix the code?
data = csvread('outfile.csv');
values = data(:,1:end-1);
labels = data(:,end);
avg = splitapply(@(x) {mean(x,1)}, values, labels+1);

Sign in to comment.

More Answers (0)

Categories

Find more on Preprocessing Data in Help Center and File Exchange

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!