% inserting columns, by using the transpose operator:Ĭ = insertrows(A.', B.',). If all input arguments are empty and have compatible sizes, then cat returns an empty array whose size is equal to the output size as when the inputs are nonempty. For example, cat(2,1 2,) returns the row vector 1 2. Using permute (or transpose) INSERTROWS can easily function to insert columns, planes, etc: When concatenating an empty array to a nonempty array, cat omits the empty array in the output. % matrix B is expanded to a row vector and inserted twice (as in 2) = INSERTROWS(.) will return the row indices RA and RB for which C corresponds to the rows of either A and B.Ĭ = insertrows(rand(5,2),zeros(2,2),) If A is sparse, C will be sparse as well. If any of the inputs are empty, C will return A. C = INSERTROWS(A,B) will simply append B to A. Values of IND smaller than one will cause the corresponding rows to be inserted in front of A. In all other cases, the number of elements in IND should be equal to the number of rows in B, and the number of columns, planes etc should be the same for both matrices A and B. and say that want to add the rows 1.5, 2.25 after row 1, 5.5, 30.25 after row 5 and 6.5, 42.25 after row 6. If B is a single value, B is expanded to a row vector. If IND is a single value, the whole matrix B will be inserted at that position. If B is a 1-by-N matrix, B will be inserted for each insertion position specified by IND. Turn a Matrix into a Row Vector in MATLAB Read Practice Conversion of a Matrix into a Row Vector. For example, create a 2-by-3 matrix and add an additional row and column to it by inserting an element in the (3,4) position. If A is a N-by-X matrix and B is a M-by-X matrix, C will be a (N+M)-by-X matrix. MATLAB automatically pads the matrix with zeros to keep it rectangular. Row k of matrix B will be inserted after position IND(k) in the matrix A. Do you mean to 1)add a nx1 array to then end of a nxm matrix, enlarging the matrix 2) insert such an array into the middle of a matrix, enlarging the matrix 3) overwrite that array, keeping the same size matrix 4) are you able to preallocate a matrix of zeros and thus do 3) anyway (it would be faster than augmenting the matrix) Keegan. INSERTROWS - Insert rows into a matrix at specific locationsĬ = INSERTROWS(A,B,IND) inserts the rows of matrix B into the matrix A at the positions IND.
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