annotate util/ksvd utils/rowlincomb.m @ 198:83af80baf959 luisf_dev

Reverted SMALL_two_step to the original version; adds path in the Init script.
author luisf <luis.figueira@eecs.qmul.ac.uk>
date Tue, 20 Mar 2012 12:29:47 +0000
parents c3eca463202d
children
rev   line source
idamnjanovic@70 1 %ROWLINCOMB Linear combination of matrix rows.
idamnjanovic@70 2 % Y = ROWLINCOMB(X,A,ROWS) computes a linear combination of the rows of
idamnjanovic@70 3 % the matrix A. The row indices are specified in the vector ROWS, and the
idamnjanovic@70 4 % correspoinding coefficients are specified in the vector X. The vectors
idamnjanovic@70 5 % ROWS and X must be of the same length. The call Y = ROWLINCOMB(X,A,ROWS)
idamnjanovic@70 6 % is essentially equivalent to the command
idamnjanovic@70 7 %
idamnjanovic@70 8 % Y = X'*A(ROWS,:) .
idamnjanovic@70 9 %
idamnjanovic@70 10 % However, it is implemented much more efficiently.
idamnjanovic@70 11 %
idamnjanovic@70 12 % Y = ROWLINCOMB(X,A,ROWS,COLS) only works on the columns of A specified
idamnjanovic@70 13 % in COLS, returning a vector of length equal to COLS. This call is
idamnjanovic@70 14 % essentially equivalent to the command
idamnjanovic@70 15 %
idamnjanovic@70 16 % Y = X'*A(ROWS,COLS) .
idamnjanovic@70 17 %
idamnjanovic@70 18 % See also COLLINCOMB.
idamnjanovic@70 19
idamnjanovic@70 20
idamnjanovic@70 21 % Ron Rubinstein
idamnjanovic@70 22 % Computer Science Department
idamnjanovic@70 23 % Technion, Haifa 32000 Israel
idamnjanovic@70 24 % ronrubin@cs
idamnjanovic@70 25 %
idamnjanovic@70 26 % April 2009