Ind2sub

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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.

Ind2sub

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. Given just the N -element sizes array from above, this returns another function, which takes one index argument, that in turn yields the final N -element subscripts array. This function will cache an intermediate array that depends on sizes , to speed up repeated calls to ind2sub for the same array sizes. A loop over large sizes that uses the optimized function might be 10x faster than the equivalent loop with plain ind2sub calls. Run clang-format to prettify the TypeScript:.

Edited: Walter Roberson on 23 Ind2sub Go to file.

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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.

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.

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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. This example shows the different results when you return fewer output arguments for a 3-dimensional array. You may receive emails, depending on your communication preferences. Output Arguments collapse all row — Row subscripts scalar vector matrix multidimensional array. Search Support Clear Filters. The ind2sub function converts the linear indices into subscripts. Use ind2sub with Fewer Output Arguments. 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. Unable to complete the action because of changes made to the page. Answers Support MathWorks. Size vectors for arrays with more than intmax elements are not supported. 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. MathWorks Answers Support. Notifications Fork 0 Star 2.

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Report repository. How it works. As always, my pleasure! Given just the N -element sizes array from above, this returns another function, which takes one index argument, that in turn yields the final N -element subscripts array. What is ind2sub. Browser If you want to load this as a global variable in the browser, download ind2sub-browser. Packages 0 No packages published. Data Types: double. 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. Create the input arguments needed to convert the linear indices 1 through 8 for a 3-dimensional array with size 2-byby This function fully supports thread-based environments. Search Answers Clear Filters. A higher-order function. Search Support Clear Filters. This is the code where I had doubt on the syntax of ind2sub.