ISLANDS finds all "islands" which are 4-connected components in a matrix. The function will return three output arguments, including the largest connected island in the input matrix. See the detailed help for all descriptions.
Inspired by a recent puzzler posted here:
and by the submission from Tim Davis.
Also included is a MEX-File version which runs faster than the M-File version.
Tested on 2007a and 2007b.
Please email me about bugs and other concerns. Thanks.
Matt Fig (2022). ISLANDS (https://www.mathworks.com/matlabcentral/fileexchange/21376-islands), MATLAB Central File Exchange. Retrieved .
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