MATLAB array manipulation tips and tricks

CHAPTER 2. OPERATORS, FUNCTIONS AND SPECIAL CHARACTERS 42.2 Built-in functionsallanycumsumdiagdiffendeyefindisemptyisequalisfiniteisinfislogicalisnanisnumericlengthlogicalndimsnumelonespermuteprodreshapesizesortsumtriltriuzerosTrue if all elements of a vector are nonzero.True if any element of a vector is nonzero.Cumulative sum of elements.Diagonal matrices and diagonals of a matrix.Difference and approximate derivative.Last index in an indexing expression.Identity matrix.Find indices of nonzero elements.True for empty matrix.True if arrays are numerically equal.True for finite elements.True for infinite elements.True for logical array.True for Not-a-Number.True for numeric arrays.Length of vector.Convert numeric values to logical.Number of dimensions.Number of elements in a matrix.Ones array.Permute array dimensions.Product of elements.Change size.Size of matrix.Sort in ascending order.Sum of elements.Extract lower triangular part.Extract upper triangular part.Zeros array.Some of these functions are shorthands for combinations of other built-in functions, liklength(x) is max(size(x))ndims(x) is length(size(x))numel(x) is prod(size(x))Others are shorthands for frequently used tests, likeisempty(x) is numel(x) == 0isinf(x) is abs(x) == Infisfinite(x) is abs(x) ~= InfOthers are shorthands for frequently used functions which could have been written with low-levelcode, like diag, eye, find, sum, cumsum, cumprod, sort, tril, triu, etc.