' File XVIIa - - 3rd order DEQ.

'    Mode = 2 has the form:
'              X'{t} = F{t,x,y,z}
'              Y'{t} = G{t,x,y,z}
'              Z'{t} = H{t,x,y,z}
' The ORDER of parameters: _{t, X, Y, Z} for mode 2; _{t, X, X', X''} for mode 1

' Mode ID is placed as the last parameter in the command. This example will use Mode = 2.
' The algorithms are identical, but the displays with different labels have different interpretations.

F{t,x,y,z}  = -0.1x - y
G{t,x,y,z} = x - 0.1 y
H{t,x,y,z} = -0.2 z

to = 0: tf = 15 : xo = 5: yo = 5: zo = 10

IVP[F, G, H, {to, tf, xo, yo, zo} {1, .05, 2}]      ' <-- mode = 2

