![]() ![]() It takes a matrix M that used to have x rows and y columns and turns it into a matrix with a rows and b columns. With a matrix, diag pulls out the diagonal elements and makes a vector out of them. See in the snippet below a successful deletion of the fourth element of a vector, and what happens when I try to delete just one element from a 4x3 matrix.Ī null assignment can have only one non-colon index.ĭiag on a vector creates a matrix whose diagonal is the initial vector and whose other elements are zero. Using empty brackets to delete elements from a matrix works if you are going to delete a whole row or a whole column, but not just one element. Deleting is not the same as assigning zero to the value of that element. Use empty brackets to delete an element from a vector or a row/column from a matrix. To append vectors to a matrix you need to make sure the dimensions work out so that all rows have the same number of elements. You need to use two arguments: diag (v,k) places the elements of vector v on the kth diagonal. If it is not the next consecutive position, MATLAB pads the elements in between with zeros. To append an element to a vector just specify a value at the desired position. M(,) addresses the intersection of rows a and b and columns c through d and e. For example v() addresses elements a, b, and c through d. Use a square bracket to address nonconsecutive elements in a vector or matrix. M(:,a) addresses column a, M(a,:) addresses row a, M(:,a:b) addresses columns a through b, M(a:b,:) addresses rows a through b, M(a:b,c:d) addresses the intersection of rows a through b and columns c through d. For example, v(:) addresses all the elements of a vector, v(a:b) addresses elements a through b in vector v. Use the colon operator to address a range of elements in a vector or matrix. ![]() It's just like playing Battleship except both the columns and rows are designated by numbers. Then I ask it for the element in the second row and third column. In the example below I make a 3x3 matrix M. M(1,1) addresses the element in the top left corner of the matrix M. For example, v(1) addresses the first element in a vector v. You can also use that technique to address a specific spot in a matrix. We've already practiced using parentheses to address a certain element of a vector. ![]()
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