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Over the years, I have actually received countless questions about financial calculators. I will compile a list of the most frequently asked questions here.

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Q: when using the NPV and IRR functions, can you describe the optional cash flow counts part?

A: Sure. That feature is over there to save some data entrance in particular circumstances, and it offer an the same purpose come the frequency prompt in many other financial calculators. If few of your cash flows repeat, climate you can incorporate the "cash flow counts" array. Permit me offer you an example:

What is the existing value of the following collection of cash flows if the discount rate is 8% every year?

100, 200, 200, 200, 300.

Normally, you can solve this trouble using the NPV duty as follows:

NPV(8,0,100,200,200,200,300)

but an alert that you had to form "200" 3 times in a row. Making use of the "cash flow counts" range we can do it like this:

NPV(8,0,100,200,300,1,3,1)

Either way, girlfriend will discover that the current value is $774.01. However, the second technique saves a little bit that typing and is less likely to lead to data entry errors. It doesn't yes, really save lot time in this basic example, however in other problems it can. Be aware that if you usage the "cash flow counts" array, you must go into a frequency for each that the cash flows — also those that don't repeat.

Q: The TI-83 (and other) manual tells me to use lists in the NPV and also IRR functions. Why don't you use them?

I'm a rebel! Seriously, I simply think the it is quicker and also easier to create on-the-fly arrays rather than usage lists. For many of what ns do, I'm not going come reuse a list much more than as soon as or double anyway. As soon as I do want to reuse it, I have the right to usually use the modifying functions to easily get that done.

Q: Why to be I obtaining an error once I use the NPV and/or IRR functions?

Well, the depends. Most often, the errors that I view in class are caused by somebody not being careful around separating each variable in the role by commas. Every comma the you check out (above) is absolutely required. One more frequent cause of errors is neglecting to make the early stage outlay a an unfavorable number. You need to obey the cash flow sign convention whether you are using the TVM Solver or the functions.

Q: how do ns calculate the variety of days between two dates using the TI 83?

A: The TI 83 and also 83 Plus support two date formats, MM.DDYY or DDMM.YY. You calculate the difference in between two work by using the dbd (days in between dates) duty from the Finance menu. Because that example, to uncover the number of days in between 25 July 2007 and also 31 December 2007 you would type:

dbd(08.2507,12.3107) if you room using MM.DDYY

or

dbd(2508.07,3112.07) if you room using DDMM.YY

Either way, you will discover that there room 128 days between those 2 dates.

Note that the TI 83 does not enable you come specify a day count basis (e.g., 30/360 or actual/360). The basis is always actual/actual.

Q: how do I uncover roots various other than square roots making use of the TI-83 Plus?

In finance it seems that we room forever calculating various roots (cube root, fourth root, 365th root, etc). Fortunately, this is pretty straightforward to do if you have the right to remember a an easy mathematical rule:

X = X^frac1N>

So, to calculate the fifth root the 100, we just raise 100 to the 1/5th power. To perform this ~ above the TI-83 to add type: 100^(1/5) ENTER. In this example, the 5th root of 100 amounts to 2.51189. Note that the parentheses room important, otherwise you would certainly raise 100 come the first power and also then division by 5 and also you would gain 20 as the answer. Utilizing this method you can calculate any kind of root.

Q: my calculator only has actually a key to calculate herbal logarithms. Exactly how do ns calculate logarithms to various other bases (say, basic 10)?

A: most often, in finance, we use organic logarithms (base e), generally abbreviated together Ln(x). However, sometimes we must use other bases. Converting from base e to any kind of other base can be done through the adhering to formula (I'm converting to base 10):

So, just calculate the organic log of your number (use the LN key), and also then divide it through the organic log the the brand-new base. Because that example, Log10(3) = Ln(3)/Ln(10) = 0.478. Keep in mind that the TI-83 add to does have actually a LOG crucial for calculating base 10 logarithms. Still, if girlfriend need an additional base the over formula will work-related — just readjust the 10 to your selected base.

Q: How can I clear the memory of every variables and also lists?

A: uneven a complete reset (see below) this is pretty for sure to do, despite be cautious not come delete any kind of lists or variables the you must save. To clean all storage in a TI 83 or TI 83 Plus:

Press 2nd MEM (that is the second duty of the + key)Select 2Select 1 (All)Scroll with the list and delete anything the isn't important.

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Q: How can I completely reset my TI 83 or TI 83 Plus ago to the factory default settings?

A: Be cautious with this together it will certainly remove any programs that you may have stored in the calculator. V that disclaimer stated, here's just how to reset it:

Press 2nd MEM (that is the second duty of the + key)Choose 7 (Reset)Scroll ideal so that ALL is selectedPress 1Press 2 (Reset, and read the warnings)

Note that it is possible that a reset may influence the contrast of her screen. If necessary, you can adjust the comparison of the screen on the TI-83 through pressing second and climate the up arrowhead (or down arrow) button. You may need to do this repeatedly.