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How to exclude data based on quality control flags

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Addie Norgaard
Addie Norgaard on 15 Oct 2019
Edited: Adam Danz on 16 Oct 2019
Hi,
I have a data set where each value has a quality control flag associated with it. What would be the most effecient way for me to exclude and include values based on QC value?

  2 Comments

Adam Danz
Adam Danz on 15 Oct 2019
There's not enough detail in your question. Let's assume you have a vector of data "x" and a vector of QC values "qc". I assume the qc values are numeric or logical.
If they are logical and 'true' means "keep",
x(qc) %this eliminates any of the bad data
% or
x(qc) = NaN; % This replaces any of the bad data with "missing" data
The benefit of the 2nd line above is that the size and index values of 'x' do not change.
If your qc values are numeric and range from j to i, you can set a threshold 't' where any qc values greater than t are accepted.
xAccepted = x(qc > t);
% or
x(qc <= t) = NaN;
Addie Norgaard
Addie Norgaard on 16 Oct 2019
Apologies for the lack of detail. x(qc <= t) = NaN; is a great solution. Thank you Adam Danz!

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