how to select each row for different operation from a matrix

Question

I have a sequence

A = 1:5

then I did its random permutation by

B = perms(A)
C = B(randperm(size(B,1)), :)

then I took a sample of 5 sequence randomly as follow

sample = C(1:5,1:4)

then I took a random sequence from sample as follow

randomRow = sample(randi(size(sample,1)),:)

I use the above random row for my operation. Now I am stuck how to select another row from a sample and do same operation on it, until I do operation on all rows in a sample and each row is not repeated from sample once it's processed.

Dan · Accepted Answer · 2016-05-11 08:03:21Z

4

you can use the below code:

For i=randperm(size(sample,1))
    Rand_row=sample(i,:)
    %// operate on Rand_row
End

edited May 11, 2016 at 8:03

Dan

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answered May 11, 2016 at 7:41

gionni

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Comments

Dan · Accepted Answer · 2016-05-11 07:17:51Z

3

Why not just use the same trick you used earlier with randperm to shuffle the rows of sample and then just iterate through them?

sample_shuffled = sample(randperm(5),:)
for s = 1:5
    randomRow = sample_shuffled(s,:)
    %// Operate on randomRow
end

answered May 11, 2016 at 7:17

Dan

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2 Comments

sarah Over a year ago

Dan, how to put the result of each row operation in some different place so in end i can see the output of each operation i perform on each row. ?

Dan Over a year ago

in the loop do something like outputs(s) = ... but don't forget to preallocate memory for outputs before your loop to avoid growing the variable in the loop

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