Welcome to Adams/Solver Subroutines - Kxcad.net

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Adams/Solver
Input Arguments
h0 A double-precision variable that specifies the value of the function before
the step (x £ x0).
h1 A double-precision variable that specifies the value of the function after the
step (x x1).
iord An integer variable that defines the order of the derivative that HAVSIN is
to return. The order is usually zero, but it can be one or two.
x A double-precision variable that specifies the independent variable.
x0 A double-precision variable that specifies the x value at which the haversine
function begins.
x1 A double-precision variable that specifies the value at which the haversine
function ends.
Output Arguments
errflg A logical (true or false) variable that HAVSIN returns to the calling
subroutine. If HAVSIN detects an error in the subroutine call
statement, it sets errflg to true before it returns errflg to the calling
subroutine.
value A double-precision value the subroutine returns. If iord equals zero,
value is the function evaluated at x. If iord equals one, value is the first
derivative of F(x) with respect to the independent variable x. If iord
equals two, value is the second derivative of F(x) with respect to the
independent variable x. Value is:
Extended Definition
0
1
2
IORD: Value:
F( x)
∂ F( x)
--------------
∂ x
∂ F 2 ( x)
∂ x 2
----------------
The HAVSIN general subroutine evaluates a haversine function. Figure 1 below illustrates the haversine