Initializing help system before first use

# getcoeff

Purpose
Get a constraint coefficient or constant term.
Synopsis
`function getcoeff(c:linctr):real`
`function getcoeff(c:linctr, x:mpvar):real`
`function getcoeff(c:linctr, n:integer):real`
Arguments

c | A linear constraint
x | A decision variable
n | -1 for constant term, -2 for range lower bound

Return value
Coefficient of the variable or a constant term.
Example
In this example a single constraint with three variables is defined. The calls to getcoeff result in r taking the value -1 and s taking the value -12.

    declarations
     x,y,z:mpvar
    end-declarations

    c:= 4*x + y -z <= 12
    r:= getcoeff(c, z)
    s:= getcoeff(c)

Further information
This function returns the coefficient of a given variable in a constraint, or if no variable is given, the constant term (= -RHS) of the constraint. The returned values correspond to a normalised constraint representation with all variable and constant terms on the left side of the (in)equality sign.
Related topics
getcoeffs, getvars, setcoeff.
Parent Topic Predefined functions and procedures

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