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1 sty 2018 · In MATLAB®, there are three primary approaches to accessing array elements based on their location (index) in the array. These approaches are indexing by position, linear indexing, and logical indexing. You can also use mixed indexing by combining both positional and logical indexing.
2 kwi 2011 · Indexing into a matrix is a means of selecting or modifying a subset of elements from the matrix. MATLAB ® has several indexing styles that are not only powerful and flexible, but also readable and expressive.
k = find(X) returns a vector containing the linear indices of each nonzero element in array X. If X is a vector, then find returns a vector with the same orientation as X. If X is a multidimensional array, then find returns a column vector of the linear indices of the result. example.
Consider the matrix A = [1 2 3 4;5 6 7 8]. There are actually two ways to view this matrix, either as a rectangular array of 2 rows and 4 columns, or as a list of 8 elements. Suppose we wanted to isolate the 7 in the matrix A and store it as the variable temp.
Indexing into a matrix is a means of selecting a subset of elements from the matrix. MATLAB has several indexing styles that are not only powerful and flexible, but also readable and expressive. Indexing is a key to MATLAB's effectiveness at capturing matrix-oriented ideas in understandable computer programs.
1 sty 2018 · This method is known as linear indexing. While MATLAB displays arrays according to their defined sizes and shapes, they are actually stored in memory as a single column of elements. A good way to visualize this concept is with a matrix.
Matrix Indexing. 2 3 A(1; 1) A(1; 2) A(1; 3) A(1; 4) 6 A(2; 1) A(2; 2) A(2; 3) A(2; 4) Matlab uses (row,column) subscripts to label matrices: 7. 6. 4 A(3; 1) A(3; 2) A(3; 3) A(3; 4) 7. 5. A(4; 1) A(4; 2) A(4; 3) A(4; 4) A(1) A(5) A(9) A(13) 3. 2. Matlab numbers down each column in turn: 6 A(2) A(6) A(10) A(14) 7. 6 A(3) A(7) A(11) A(15) 7. 4 5.
