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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.
To find the rows of a table where values meet conditions, use logical indexing. Specify the table variables that have values of interest and create an array of row indices where values in those variables meet conditions that you specify.
10 wrz 2011 · Array Indexing. Every variable in MATLAB® is an array that can hold many numbers. When you want to access selected elements of an array, use indexing. For example, consider the 4-by-4 matrix A: A = [1 2 3 4; 5 6 7 8; 9 10 11 12; 13 14 15 16] A = 4×4. 1 2 3 4. 5 6 7 8. 9 10 11 12.
If you want to combine the indices like having odd row - odd column, and even row - even column, just compute two sets of indices, concatenate them into a single vector and do the same syntax like before.
1 sty 2018 · In general, you can use indexing to access elements of any array in MATLAB regardless of its data type or dimensions. For example, directly access a column of a datetime array. t = [datetime(2018,1:5,1); datetime(2019,1:5,1)]
17 kwi 2022 · t = array2table (a); u = t (t.a1 == 'don', :); % error: Undefined operator '==' for cell. How do I do a logical search for the row where a1 is 'bye'? If it was numbers, it would be easy: Theme. Copy. b = [1,2 ; 3,4]; q = array2table (b); r = q (b1 == 3, :); # works perfectly.
31 maj 2013 · Let's review indexing techniques in Matlab: Indexing one dimensional array, two dimensional array, logical indexing, reversing a vector - are covered.
