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.

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.

Multidimensional subscripts, returned ind2sub a scalar, vector, matrix, or multidimensional array.

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Ind2sub

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.

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Access Element of 3-D Array. Based on your location, we recommend that you select:. Toggle Main Navigation. View all files. See Also. Based on your location, we recommend that you select:. Search Support Clear Filters. Sign in to comment. Row subscripts, returned as a scalar, vector, matrix, or multidimensional array. Releases No releases published. 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. A loop over large sizes that uses the optimized function might be 10x faster than the equivalent loop with plain ind2sub calls. Toggle Main Navigation.

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.

The size of row is the same as the size of the input ind. Choose a web site to get translated content where available and see local events and offers. 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. Convert the linear indices [3 4 5 6] to subscripts in a 2-byby-2 array. Open Mobile Search. Thanks for the answer Star Strider : I am not able to visualise the effect of idx in this. Do you want to open this example with your edits? Notifications Fork 0 Star 2. Convert the linear indices [3 4 5 6] to row and column subscripts in a 3-by-3 matrix. Unlicense license. Sign in to answer this question. 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 License Unlicense license.