Documentation


GRBgetpwlobj

int GRBgetpwlobj ( GRBmodel *model,
    int var,
    int *npointsP,
    double *x,
    double *y )

Retrieve the piecewise-linear objective function for a variable. The <span>$</span>x<span>$</span> and <span>$</span>y<span>$</span> arguments must be large enough to hold the result. If either are NULL, then npointsP will contain the number of points in the function on return.

Refer to this discussion for additional information on what the values in <span>$</span>x<span>$</span> and <span>$</span>y<span>$</span> mean.

Return value:

A non-zero return value indicates that a problem occurred while retrieving the piecewise-linear objective function. Refer to the Error Code table for a list of possible return values. Details on the error can be obtained by calling GRBgeterrormsg.

Arguments:

model: The model from which the piecewise-linear objective function is being retrieved.

var: The variable whose objective function is being retrieved.

npointsP: The number of points that define the piecewise-linear function.

x: The <span>$</span>x<span>$</span> values for the points that define the piecewise-linear function. These will always be in non-decreasing order.

y: The <span>$</span>y<span>$</span> values for the points that define the piecewise-linear function.

Example usage:

  double *x;
  double *y;

  error = GRBgetpwlobj(model, var, &npoints, NULL, NULL);
  /* ...allocate x and y to hold 'npoints' values... */
  error = GRBgetpwlobj(model, var, &npoints, x, y);