How to prevent MATLAB from using parallel calculations for QR factorization?

To compare the runtime of two algorithms, I need to prevent MATLAB from using parallel computation for the qr function. I am a Mac user and would like to know how to avoid it.

Answer 1

[John D'Errico]

https://www.mathworks.com/matlabcentral/answers/103133-how-can-i-limit-the-number-of-computational-threads-used-by-matlab-in-matlab-7-10-r2010a