How to use the several average of same class

Hello.

I have a data (90 x 2857), column 2857 is a label(class).

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);

Answer 1

[David Hill]

a=randi(size(values,1),5,1);%randomly choose 5 rows
avg=mean(values(a,:),2);%compute mean of the rows

[Kong]

Thank you.

I want to get several mean vector (1 x 2856) for same class.

Could you recommend different code?

[David Hill]

I might not understand you. Do you want to randomly find the mean of one of the elements of the avg cell-array?

a=mean(avg{randi(length(x),1)});

[Kong]

Hello. I want to get several mean for same class. For example, there are 10 rows for "running" data. I want to ramdomly select 5 rows of 10 rows for "running" and compute the average of 5 rows. So I can get several mean rows about "running". I want to use these average.

[David Hill]

b=randperm(length(avg),5);
for k=1:5
    a(k)=mean(avg{b(k)});
end

[Kong]

Thank you so much. I got this error.

data = csvread('outfile.csv');
values = data(:,1:end-1);
labels = data(:,end);
avg = splitapply(@(x) {mean(x,1)}, values, labels+1);
a=mean(avg{randi(length(values),1)});

b=randperm(length(avg),5 );
for k=1:5
a(k)=mean(avg{b(k)});
end