# Ind2sub

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JavaScript library to unravel a linear index into subscripts that index into a multi-dimensional array of a given size Julia and Matlab people know what's what. Convert a linear index , and an array of sizes , to an array of subscripts that index into a multi-dimensional array of size sizes in the Fortran column-major convention first index varies fastest. Then in Node, you can use it:. Browser If you want to load this as a global variable in the browser, download ind2sub-browser. Given some conceptual N -dimensional array with sizes sizes an N -element array , and a linear index into that array in Fortran, column-major, order , this returns another N -element array of subscripts needed to reach that index. Examples were given above. A higher-order function.

## Ind2sub

Help Center Help Center. Here sz is a vector with two elements, where sz 1 specifies the number of rows and sz 2 specifies the number of columns. Here sz is a vector with n elements that specifies the size of each array dimension. Convert the linear indices [3 4 5 6] to row and column subscripts in a 3-by-3 matrix. The mapping from linear indices to subscripts indexing by position is illustrated in the following. Convert the linear indices [3 4 5 6] to subscripts in a 2-byby-2 array. The mapping from linear indices to subscripts indexing by position for a 2-byby-2 array can be illustrated as in the following. When using ind2sub for an N-dimensional array, you would typically supply N output arguments for each dimension of the matrix. This example shows the different results when you return fewer output arguments for a 3-dimensional array. Create the input arguments needed to convert the linear indices 1 through 8 for a 3-dimensional array with size 2-byby Specify three output arguments when using ind2sub to return the row, column, and page subscripts for the 2-byby-2 array. If you specify only two output arguments, ind2sub ignores the third dimension of the array and returns subscripts for a 2-dimensional array with size 2-by-4 instead. If you specify only one output argument, ind2sub ignores the second and third dimensions of the array and returns subscripts for a 1-dimensional array with size 1-by-8 instead. Size of array, specified as a vector of positive integers.

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Matlab supports 3 forms of indexing matrices. There is the familiar range indexing that selects a submatrix within a larger matrix:. These two methods are fairly expressive, yet there are a certain number of operations which are awkward or impossible to perform with these. You might think this requires the use of a loop or some special function within Matlab. Yet this operation is easily done in a single step with linear indexing. Background: a Matlab matrix is internally stored as a flag defining its shape, followed by sequential numeric data organized such that the first index of the matrix grows fastest and the last grows slowest. If a matrix has size 10,20 , the element 1,1 has linear index 1, the element 10,1 has index 10, 1,2 has index 11, and so forth. And translate them into linear indices.

### Ind2sub

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Accepted Answer. The mental image I have is a long linear chunk of memory: 0 1 2 3 4 5 6 7 8 9 10 11 …. Reload to refresh your session. Unable to complete the action because of changes made to the page. Convert a linear index , and an array of sizes , to an array of subscripts that index into a multi-dimensional array of size sizes in the Fortran column-major convention first index varies fastest. Sign in to answer this question. Run clang-format to prettify the TypeScript:. Size of array, specified as a vector of positive integers. Access Element of 3-D Array. As always, my pleasure! Toggle Main Navigation. Choose a web site to get translated content where available and see local events and offers. Vote 1.

Help Center Help Center. Here sz is a vector with two elements, where sz 1 specifies the number of rows and sz 2 specifies the number of columns.

MATLAB uses linear indexing for arrays, however many arrays are also referred to by subscripts into the rows, columns, and additional dimensions. Convert the linear indices [3 4 5 6] to row and column subscripts in a 3-by-3 matrix. Select a Web Site Choose a web site to get translated content where available and see local events and offers. You are now following this question You will see updates in your followed content feed. Extended Capabilities Tall Arrays Calculate with arrays that have more rows than fit in memory. Run clang-format to prettify the TypeScript:. Data Types: double. You signed out in another tab or window. The mental image I have is a long linear chunk of memory: 0 1 2 3 4 5 6 7 8 9 10 11 …. The generated code treats NaN inputs as out of range and throws a run-time error. This function fully supports thread-based environments. That's basically the logic, encoded in two lines of TypeScript, that sits in the middle of this library. Search Answers Clear Filters. Off-Canvas Navigation Menu Toggle. Answers Support MathWorks.

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