I am currently working on a research project. In the attached image what does the capital $|I|$ and $|J|$ mean ?
2026-03-25 15:41:14.1774453274
What is the meaning of |⋯| notation for an index subset?
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In your case, $| I |$ stands for the number of rows in the bicluster and similarly, $| J | = $ number of columns. More generally, the notation $|A|$ (usually) means the number of elements in a set $A$.