oversampling an array randomly

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Ahmed Abdulla
Ahmed Abdulla on 1 Sep 2021
Commented: Chunru on 1 Sep 2021
I have an array that contains 300 observations, and i would like to oversample this array to 472 observation. but i would this to be done randomly (randomly pick 172 observations and duplicate them). I've been looking online but with no luck

Accepted Answer

Chunru
Chunru on 1 Sep 2021
a = randn(300, 1); % original data
idx = randperm(300, 172); % randomly pick 172 from 300
a1 = [a; a(idx)];
whos
Name Size Bytes Class Attributes a 300x1 2400 double a1 472x1 3776 double idx 1x172 1376 double
  2 Comments
Chunru
Chunru on 1 Sep 2021
If you want to ensure that original 300 are always included and addtional 471 are randomly sampled, you can do the following:
a = randn(300, 1); % original data
idx = randi([1 300], [471 1]); % 471 random numbers btw 1 and 300
a1 = [a; a(idx)];
whos
Name Size Bytes Class Attributes a 300x1 2400 double a1 771x1 6168 double idx 471x1 3768 double

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