how to get the list of data that is not sampled when datasample is used

Hi,

I have used the following code to take a random sample (of 300 values) from a data set of a total of 475 values:

[rco, idxco] = datasample (Controlall(1,:), 300);

This has resulted in a 1x300 double called rco of the sampled data with a 1x300 doubled called idxco showing me which pieces of the original data have actually been sampled.

I want to now access the remaining 175 values of unsampled data and was wondering if there is a way to put them into some sort of array without manually going through and taking note of which of the original values have been sampled already and which have not? Is this possible?

Answer 1

[Jan]

[rco, idxco] = datasample (Controlall(1,:), 300);
missIndex = setdiff(1:size(Controlall, 2), idxco);
missValue = Controlall(missIndex);

or:

missIndex = true(1, size(Controlall, 2));
missIndex(idxco) = false;
missValue = Controlall(missIndex);

Here missIndex is a logical index vector, for the above version it is a vector of the indices. The 2nd version will be faster.

Or:

missValue = Controlall(1, :);
missValue(idxco) = [];

if you need the values only and not the indices.

[Ross Johnston]

Hi Jan,

Thanks for the speedy response and multiple ways of doing what doing what I wanted to do!