% -*- texinfo -*- % @deftypefn {Function File} {[@var{b}, @var{c}] =} spdiags (@var{a}) % @deftypefnx {Function File} {@var{b} =} spdiags (@var{a}, @var{c}) % @deftypefnx {Function File} {@var{b} =} spdiags (@var{v}, @var{c}, @var{a}) % @deftypefnx {Function File} {@var{b} =} spdiags (@var{v}, @var{c}, @var{m}, @var{n}) % A generalization of the function @code{diag}. Called with a single % input argument, the non-zero diagonals @var{c} of @var{A} are extracted. % With two arguments the diagonals to extract are given by the vector % @var{c}. % % The other two forms of @code{spdiags} modify the input matrix by % replacing the diagonals. They use the columns of @var{v} to replace % the columns represented by the vector @var{c}. If the sparse matrix % @var{a} is defined then the diagonals of this matrix are replaced. % Otherwise a matrix of @var{m} by @var{n} is created with the % diagonals given by @var{v}. % % Negative values of @var{c} represent diagonals below the main % diagonal, and positive values of @var{c} diagonals above the main % diagonal. % % For example % % @example % @group % spdiags (reshape (1:12, 4, 3), [-1 0 1], 5, 4) % @result{} 5 10 0 0 % 1 6 11 0 % 0 2 7 12 % 0 0 3 8 % 0 0 0 4 % @end group % @end example % % @end deftypefn

- spdiags % A generalization of the function @code{diag}. Called with a single

- spdiags % A generalization of the function @code{diag}. Called with a single

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