Halting and restarting the irr% calculation, Storing a guess for irr – HP 17bII+ User Manual
Page 239
B: More About Calculations 239
File name : English-M02-1-040308(Print).doc Print data : 2004/3/9
This is the only answer.
Case 4: The calculator displays the message:
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:
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
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
.
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