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.

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.

MATLAB uses linear indexing for arrays, however many arrays are also referred to by subscripts into the rows, columns, ind2sub, and additional ind2sub.

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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.

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.

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How it works. In this example:. Support Answers MathWorks. Column subscripts, returned as a scalar, vector, matrix, or multidimensional array. You may receive emails, depending on your communication preferences. This function will cache an intermediate array that depends on sizes , to speed up repeated calls to ind2sub for the same array sizes. You have a modified version of this example. Accepted Answer. Choose a web site to get translated content where available and see local events and offers. Branches Tags.

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Branches Tags. Usage notes and limitations: bit integer linear indices are not supported. Search MathWorks. Size vectors for arrays with more than intmax elements are not supported. Input Arguments collapse all sz — Size of array vector of positive integers. This means that the second subscript increments only after iterating through 2-tuples in the linear array: the second subscript is:. 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 the linear indices [3 4 5 6] to row and column subscripts in a 3-by-3 matrix. Trial software. Usage notes and limitations: The first argument must be a valid size vector. Thanks for the answer Star Strider : I am not able to visualise the effect of idx in this. To get the linear indices of matrix elements that satisfy a specific condition for matrix A , you can use the find function with one output argument. Vote 1. Examples were given above.