Alternatives to 'datasample'

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Veena Chatti
Veena Chatti 2020-8-22
评论： Veena Chatti 2020-9-3
Hi!
I'm looking for an alternative to the datasample function. It's a part of the Statistics & Machine Learning toolbox. Any ideas? I want to be able to sample rows of data from tables and matrices and would like to have the choice of sampling with/without replacement.
Thanks for your ideas!
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Adam Danz
Adam Danz 2020-8-22
randperm samples without replacement.
To sample with replacement, use randi.
Veena Chatti
Veena Chatti 2020-8-26
Thanks. I think I have it now.

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Kiran Felix Robert
Kiran Felix Robert 2020-8-26
Hi Veena,
Yes, randomperm (without replacement) and randi (with replacement) can be used as an alternative.
Furthermore, if the dataset has been converted to either a matrix or an array format, the rows can be sampled without using a loop as shown in the example as follows,
X = rand(50,10); % Assume X is the dataset
SampledRows = X(randi(50,[200,1]),:); % 200 Sample rows (with replacement)
Kiran Felix Robert

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