idx_cost

idx_cost()
idx_cost() - Defines constants for named column indices to gencost matrix.
Example:

[PW_LINEAR, POLYNOMIAL, MODEL, STARTUP, SHUTDOWN, NCOST, COST] = idx_cost;

Some examples of usage, after defining the constants using the line above,
are:

 start = gencost(4, STARTUP);       % get startup cost of generator 4
 gencost(2, [MODEL, NCOST:COST+1]) = [ POLYNOMIAL 2 30 0 ];
 % set the cost of generator 2 to a linear function COST = 30 * Pg

The index, name and meaning of each column of the gencost matrix is given
below:

columns 1-5
 1  MODEL       cost model, 1 = piecewise linear, 2 = polynomial
 2  STARTUP     startup cost in US dollars
 3  SHUTDOWN    shutdown cost in US dollars
 4  NCOST       number N = n+1 of data points to follow defining an
                n-segment piecewise linear cost function, or of cost
                coefficients defining an n-th order polynomial cost function
 5  COST        parameters defining total cost function f(p) begin in
                this column
                (MODEL = 1) : p1, f1, p2, f2, ..., pN, fN
                    where p1 < p2 < ... < pN and the cost f(p) is defined
                    by the coordinates (p1,f1), (p2,f2), ..., (pN,fN) of
                    the end/break-points of the piecewise linear cost fcn
                (MODEL = 2) : cn, ..., c1, c0
                    N coefficients of an n-th order polynomial cost
                    function, starting with highest order, where cost is
                    f(p) = cn*p^n + ... + c1*p + c0

additional constants, used to assign/compare values in the MODEL column
 1  PW_LINEAR   piecewise linear generator cost model
 2  POLYNOMIAL  polynomial generator cost model