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MATLAB allows for several methods to index (access) elements of matrices and arrays:
Subscript indexing - where you specify the position of the elements you want in each dimension of the matrix separately.
Linear indexing - where the matrix is treated as a vector, no matter its dimensions. That means, you specify each position in the matrix with a single number.
Logical indexing - where you use a logical matrix (and matrix of true and false values) with the identical dimensions of the matrix you are trying to index as a mask to specify which value to return.