![]() The matrix analysis functions det, rcond, hess, and expm also show significant increase in speed on large double-precision arrays. The matrix multiply (X*Y) and matrix power (X^p) operators show significant increase in speed on large double-precision arrays (on order of 10,000 elements). As a general rule, complicated functions speed up more than simple functions. The operation is not memory-bound processing time is not dominated by memory access time. 1 2 3 4 5 6 I know that matlab allows adding vector to multiple rows, for example, Theme Copy A ( 1,2,:) A ( 1,2,:) + 1,1 then Theme Copy A 2 3 4 5 5 6 However, A ( 1,2,1,:) + 1,1 gives the same result Theme Copy A ( 1,2,1,:) A ( 1,2,1,:) + 1,1 then Theme Copy A 2 3 4 5 5 6 This is NOT what I want. 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. ![]() For example, most functions speed up only when the array contains several thousand elements or more. Theme Copy x x (1:ix-1) y x (ix,end) Warning: If you plan to make other insertions afterwards on the same vector, its indexing will be different after the point ix. The data size is large enough so that any advantages of concurrent execution outweigh the time required to partition the data and manage separate execution threads. They should require few sequential operations. These sections must be able to execute with little communication between processes. 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. The function performs operations that easily partition into sections that execute concurrently. When concatenating an empty array to a nonempty array, cat omits the empty array in the output.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |