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Reshape matrix to vector matlab3/9/2024 ![]() We want to create a matrix has 5 rows and 3. We created a vector called ‘a’ as shown by blue arrow above then we give it a matrix form with reshape () command as shown in blue box above. ![]() 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. To use reshape () command in Matlab, the used vector to create matrix must be fit to row and column number to desired matrix in reshape () like above. 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. To get the answer you want, you need to reshape to a 5x11 matrix and take the transpose: B reshape (A,5,11) Share. 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. When N is negative, shiftdim shifts the dimensions to the right and pads with singletons. ![]() When N is positive, shiftdim shifts the dimensions to the left and wraps the N leading dimensions to the end. If it is not the next consecutive position, MATLAB pads the elements in between with zeros. b shiftdim (a,-2) As per the documenation, B shiftdim (X,N) shifts the dimensions of X by N. 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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