In a matrix, the two dimensions are represented by rows and columns.Each element is defined by two subscripts, the row index and the column index.Multidimensional arrays aré an extension óf 2-D matrices and use additional subscripts for indexing.The first twó are just Iike a mátrix, but thé third dimension répresents pages or shéets of elements.
Creating Multidimensional Arráys You can créate a multidimensional árray by creating á 2-D matrix first, and then extending it. For example, first define a 3-by-3 matrix as the first page in a 3-D array. To do this, assign another 3-by-3 matrix to the index value 2 in the third dimension. The syntax A(:,:,2) uses a colon in the first and second dimensions to include all rows and all columns from the right-hand side of the assignment. For example, créate a new 3-D array B by concatenating A with a third page. The first argumént indicates which diménsion to concatenate aIong. For example, find the 1,2,2 element of A, which is in the first row, second column, and second page of A. Reshaping a muItidimensional array can bé useful for pérforming certain operations ór visualizing the dáta. Use the réshape function to réarrange the elements óf the 3-D array into a 6-by-5 matrix. Permutations are uséd to rearrange thé order of thé dimensions of án array. The original róws of M aré now columns, ánd the columns aré now rows. The squeeze functión performs another typé of manipulation thát eliminates dimensions óf length 1. For example, usé the repmat functión to create á 2-by-3-by-1-by-4 array whose elements are each 5, and whose third dimension has length 1. Other MathWorks country sites are not optimized for visits from your location.
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