HP 48gII Graphing Calculator Instrukcja Użytkownika Pobierz pdf (Strona 552)

Function RKFERR

This function returns the absolute error estimate for a given step when solving

a problem as that described for function RKF. The input stack looks as

2: {‘x’, ‘y’, ‘f(x,y)’}

After running this function, the stack will show the lines:

4: {‘x’, ‘y’, ‘f(x,y)’}

Thus, this function is used to determine the increment in the solution, ∆y, as

well as the absolute error (error).

The following screen shots show the RPN stack before and after application of

function RKFERR:

These result show that ∆y = 0.827… and error = -1.89…×10

Function RSBERR

This function performs similarly to RKERR but with the input elements listed for

function RRK. Thus, the input stack for this function will look as follows:

2: {‘x’, ‘y’, ‘f(x,y)’ ‘∂f/∂x’ ‘∂f/vy’ }

After running the function, the stack will show the lines:

4: {‘x’, ‘y’, ‘f(x,y)’ ‘∂f/∂x’ ‘∂f/vy’ }:

HP 48gII Graphing Calculator Instrukcja Użytkownika Strona 552