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1 %COLLINCOMB Linear combination of matrix columns.
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2 % Y = COLLINCOMB(A,COLS,X) computes a linear combination of the columns of
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3 % the matrix A. The column indices are specified in the vector COLS, and
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4 % the correspoinding coefficients are specified in the vector X. The
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5 % vectors COLS and X must be of the same length.
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6 %
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7 % The call Y = COLLINCOMB(A,COLS,X) is essentially equivalent to
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8 %
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9 % Y = A(:,COLS)*X .
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10 %
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11 % However, it is implemented much more efficiently.
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12 %
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13 % Y = COLLINCOMB(A,ROWS,COLS,X) only works on the rows of A specified
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14 % in ROWS, returning a vector of length equal to ROWS. This call is
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15 % essentially equivalent to the command
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16 %
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17 % Y = A(ROWS,COLS)*X .
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18 %
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19 % See also ROWLINCOMB.
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20
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21
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22 % Ron Rubinstein
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23 % Computer Science Department
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24 % Technion, Haifa 32000 Israel
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25 % ronrubin@cs
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26 %
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27 % April 2009
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