annotate examples/private/rowlincomb.m @ 5:f44689e95ea4

(none)
author idamnjanovic
date Mon, 22 Mar 2010 10:43:01 +0000
parents 7750624e0c73
children
rev   line source
idamnjanovic@1 1 %ROWLINCOMB Linear combination of matrix rows.
idamnjanovic@1 2 % Y = ROWLINCOMB(X,A,ROWS) computes a linear combination of the rows of
idamnjanovic@1 3 % the matrix A. The row indices are specified in the vector ROWS, and the
idamnjanovic@1 4 % correspoinding coefficients are specified in the vector X. The vectors
idamnjanovic@1 5 % ROWS and X must be of the same length. The call Y = ROWLINCOMB(X,A,ROWS)
idamnjanovic@1 6 % is essentially equivalent to the command
idamnjanovic@1 7 %
idamnjanovic@1 8 % Y = X'*A(ROWS,:) .
idamnjanovic@1 9 %
idamnjanovic@1 10 % However, it is implemented much more efficiently.
idamnjanovic@1 11 %
idamnjanovic@1 12 % Y = ROWLINCOMB(X,A,ROWS,COLS) only works on the columns of A specified
idamnjanovic@1 13 % in COLS, returning a vector of length equal to COLS. This call is
idamnjanovic@1 14 % essentially equivalent to the command
idamnjanovic@1 15 %
idamnjanovic@1 16 % Y = X'*A(ROWS,COLS) .
idamnjanovic@1 17 %
idamnjanovic@1 18 % See also COLLINCOMB.
idamnjanovic@1 19
idamnjanovic@1 20
idamnjanovic@1 21 % Ron Rubinstein
idamnjanovic@1 22 % Computer Science Department
idamnjanovic@1 23 % Technion, Haifa 32000 Israel
idamnjanovic@1 24 % ronrubin@cs
idamnjanovic@1 25 %
idamnjanovic@1 26 % April 2009