Indexing in matlab

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Help Center Help Center. 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. The default for direction is 'first' , which finds the first n indices corresponding to nonzero elements. Use the logical not operator on X to locate the zeros. Find the first five elements that are less than 10 in a 4-by-4 magic square matrix. For instance, find the element equal to 13 in a 1-by vector of odd integers.

Indexing in matlab

Help Center Help Center. When you want to access selected elements of an array, use indexing. There are two ways to refer to a particular element in an array. The most common way is to specify row and column subscripts, such as. Less common, but sometimes useful, is to use a single subscript that traverses down each column in order:. Using a single subscript to refer to a particular element in an array is called linear indexing. If you try to refer to elements outside an array on the right side of an assignment statement, MATLAB throws an error. However, on the left side of an assignment statement, you can specify elements outside the current dimensions. The size of the array increases to accommodate the newcomers. To refer to multiple elements of an array, use the colon operator, which allows you to specify a range of the form start:end. For example, list the elements in the first three rows and the second column of A :. The colon alone, without start or end values, specifies all of the elements in that dimension. For example, select all the columns in the third row of A :.

Array, concatenating data from all rows and variables.

Help Center Help Center. These approaches are indexing by position, linear indexing, and logical indexing. The most common way is to explicitly specify the indices of the elements. For example, to access a single element of a matrix, specify the row number followed by the column number of the element. You can also reference multiple elements at a time by specifying their indices in a vector. For example, access the first and third elements of the second row of A.

Help Center Help Center. 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. The default for direction is 'first' , which finds the first n indices corresponding to nonzero elements. Use the logical not operator on X to locate the zeros. Find the first five elements that are less than 10 in a 4-by-4 magic square matrix.

Indexing in matlab

Help Center Help Center. When you want to access selected elements of an array, use indexing. There are two ways to refer to a particular element in an array. The most common way is to specify row and column subscripts, such as. Less common, but sometimes useful, is to use a single subscript that traverses down each column in order:.

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Then replace it with a variable whose name includes the current date. Otherwise, k is a column vector. The most common way is to specify row and column subscripts, such as. If X is a multidimensional array, then find returns a column vector of the linear indices of the result. For example, you could replace all the NaN elements in an array with another value by using a combination of isnan , logical indexing, and scalar expansion. If a cell contains an array, you can access specific elements within that array using two levels of indices. Search MathWorks. Usually the number of elements on the right must be the same as the number of elements referred to by the indexing expression on the left. It can be useful to treat a variable as a categorical array when it has a fixed set of values that you can think of as categories. Another MATLAB user posted this question: I want to get the maximum of each row, which isn't really a problem, but afterwards I want to set all the other elements to zero. RedefinesDot —dot property reference, method call, and assignment. Now consider indexing into a matrix. If the cell contents cannot be concatenated, store results in a new cell array, table, or other heterogeneous container.

These three methods are now explained in more detail using the following 3-by-3 matrix M as an example:.

The most common way is to specify row and column subscripts, such as. RedefinesDot —dot property reference, method call, and assignment matlab. Based on your location, we recommend that you select:. Most often, indexing in matrices is done using two subscripts—one for the rows and one for the columns. You also can use the output of a function as a variable name. Main Content. To replace all NaN elements of the matrix B with zero, use. Index with parentheses to extract the second row of that matrix. Access Data in Tables A table is a container that stores column-oriented data in variables. Each cell can contain any type of data.