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The kappa_SQ software package is designed to assist researchers working onrandomized row sampling. The package contains a collection of Matlab functionsalong with a GUI that ties them all together and provides a platform for theuser to perform experiments. In particular, kappa_SQ is designed to doexperiments related to the two-norm condition number of a sampled matrix,$\kappa(SQ)$, where $S$ is a row sampling matrix and $Q$ is a tall and skinnymatrix with orthonormal columns. Via a simple GUI, kappa_SQ can generate testmatrices, perform various types of row sampling, measure $\kappa(SQ)$,calculate bounds and produce high quality plots of the results. All of theimportant codes are written in separate Matlab function files in a standardformat which makes it easy for a user to either use the codes by themselves orincorporate their own codes into the kappa_SQ package.

kappa_SQ: A Matlab package for randomized sampling of matrices with orthonormal columns