prod ( coeff, pattern )

Returns a linear expression that contains one term for each tuple that is present in both the tupledict and the coeff argument; coeff should be a Python dict object that maps tuples to coefficient values. For example, x.prod(coeff) would contain term 2.0*var if x[1,2] = var and coeff[1,2] = 2.0.


coeff: Python dict that maps tuples to coefficients.

pattern: Pattern to match for a key tuple.

Example usage:

  x = m.addVars([(1,2), (1,3), (2,3)])
  coeff = dict([((1,2), 2.0), ((1,3), 2.1), ((2,3), 3.3)])
  expr = x.prod(coeff) # LinExpr: 2.0 x[1,2] + 2.1 x[1,3] + 3.3 x[2,3]
  expr = x.prod(coeff, '*', 3) # LinExpr: 2.1 x[1,3] + 3.3 x[2,3]

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