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B: More About Calculations 239
File name : 17BII-Plus-Manual-E-PRINT-030709 Print data : 2003/7/11
This is the only answer.
! Case 4: The calculator displays the message:
01<@?<E
FE94:;E<FQ
3H@
;<
=4HFFQ
VF:EW
R;226S
The calculation is very complex. It might involve more than one
positive or negative answer, or there may be no solution. To continue
the calculation, you must store a guess.
! Case 5: The calculator displays:
<E
FE94:;E<
There is no answer. This situation might be the result of an error, such
as a mistake in keying in the cash flows. A common mistake is to put
the wrong sign for a cash flow. A valid cash flow series must have at
least one positive and one negative cash flow.
Halting and Restarting the IRR% Calculation
The search for IRR% may take a relatively long time. You can halt the
calculation at any time by pressing any key. The calculator then displays
the current estimate for IRR%. You can resume the calculation by:
! Pressing
s
t
while the current estimate is displayed in the
calculator line. This continues the calculation from where it left off.
! Storing a guess for IRR%, discussed below.
Storing a Guess for IRR%
To enter a guess, key in an estimate of IRR% and then press
s
t
.
You can enter a guess for IRR% at these times:
! Before beginning the calculation. This can reduce the time required to
calculate an answer.
! After you’ve halted the calculation.
! After the calculator has halted the calculation due to any of the above
cases. For cases 3 and 5, however, no (other) solutions will be found.
When calculating IRR% using a guess, the calculator displays the current
estimate of IRR% and the calculated value of NPV for each iteration. The
calculation halts when the calculator finds an answer. However, there