shake

Version 5.0 (2.16 KB) by Jos (10584)
Randomize a matrix along one dimension
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Updated 7 Feb 2019

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shake - Randomize a matrix along a specific dimension
Y = shake(X) randomizes the order of the elements in each column of the
2D matrix. For N-D matrices it randomizes along the first non-singleton
dimension.

shake(X, DIM) randomizes along the dimension DIM.

[Y, I, J] = shake(X) returns indices so that Y = X(I) and X = Y(J).

Example:
A = [1 2 3 ; 4 5 6 ; 7 8 9 ; 10 11 12] ; % see <SLM> on the FEX ...
B = shake(A, 2) % -> each row is shaked randomly
% 3 2 1
% 6 4 5
% 7 8 9
% 11 10 12%
C = sort(B, 2) % -> equals A!

For vectors V, shake(V) is similar to V(randperm(numel(V)).

The function of shake can be thought of as holding a matrix and shake
in a particular direction (dimension), so that elements are getting
shuffled within that direction only.

Cite As

Jos (10584) (2024). shake (https://www.mathworks.com/matlabcentral/fileexchange/10067-shake), MATLAB Central File Exchange. Retrieved .

MATLAB Release Compatibility
Created with R2018b
Compatible with any release
Platform Compatibility
Windows macOS Linux
Categories
Find more on Shifting and Sorting Matrices in Help Center and MATLAB Answers
Acknowledgements

Inspired: randone1, RANDSWAP, Permute a grouped vector

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Version Published Release Notes
5.0

updated for newer ML releases, updated algorithm

1.0.0.0

fixed error for scalar inputs