mtimes.m

来自「张量分析工具」· M 代码 · 共 36 行

function C = mtimes(A,B)
%MTIMES sptensor-scalar multiplication.
% 
%   C = MTIMES(A,B) is called for the syntax 'A * B' when A or B is a
%   sparse tensor and the other argument is a scalar.
% 
%   For tensor-matrix multiplication, use TTM.
%   For tensor-tensor multiplication, use TTT.
%   For tensor-tensor array multiplication, use TIMES or 'A .* B'.
%
%   See also SPTENSOR, SPTENSOR/TTM, SPTENSOR/TTT, SPTENSOR/TIMES
%
%MATLAB Tensor Toolbox.
%Copyright 2007, Sandia Corporation. 

% This is the MATLAB Tensor Toolbox by Brett Bader and Tamara Kolda. 
% http://csmr.ca.sandia.gov/~tgkolda/TensorToolbox.
% Copyright (2007) Sandia Corporation. Under the terms of Contract
% DE-AC04-94AL85000, there is a non-exclusive license for use of this
% work by or on behalf of the U.S. Government. Export of this data may
% require a license from the United States Government.
% The full license terms can be found in tensor_toolbox/LICENSE.txt
% $Id: mtimes.m,v 1.9 2007/01/10 01:27:31 bwbader Exp $

if isscalar(B)    
    C = sptensor(A.subs, A.vals * B, size(A));
    return;
end

if isscalar(A)
    C = sptensor(B.subs, B.vals * A, size(B));
    return;
end

error('MTIMES only supports the scalar case for sparse tensors');