RPN free 2

About RPN free 2 Android App

To find out if this app is of any use to you: (i) Try the EXAMPLES below ; (ii) Review the problems and solutions in the built-in GUIDE for an overview of its functionality. You may find some use of its many scientific, financial (TVM, cash flow, bond), statistics, and special (complex number/vector/fractions/dms) functions.

1. EXAMPLES. These examples introduce the Reverse Polish Notation (RPN) calculator logic pioneered by HP. Each example shows a key sequence: >> ... << , starting from the start-up screen that solves a specific problem. Note there is no need for parentheses and '=' for chain calculations in RPN.

-- To get 1+2 =3; >> 1 ENTER 2 + <<

-- To get (1+2) / (2+4) = 0.5 >> 1 ENTER 2 + 2 ENTER 4 + / <<

-- To show sin(30 deg) = 0.5 >> 30 SIN <<

-- To show arcsine(0.5) = 30 deg >> 0.5 shift ASIN <<

-- To recall a constant >> recall const (then select from the exposed list) Back <<

-- To find the real cube root of -27 >> -/+ 27 ENTER 3 ROOT << (answer : -3)

-- To find the product of (1+2i) and (1+3i)
>> (longpress)shift 1 ENTER 2 ENTER 1 ENTER 3 MUL << (answer : -5 + 5i)
(Note: Longpress ENTER displays the last entered complex number).

-- Calculate the effective yearly interest rate given the nominal yearly rate is 5% compounded monthly, then to find the nominal rate given the effective rate is 5% ?
>> (Longpress)Busi 5 ENTER 12 ENTER SET (select 9 then 8 from the exposed list) Back EFF ( answer : effective rate 5.12 (%)) NOM (answer : nominal rate 4.89 (%))<<

-- To find the greatest common divisor of 108(4x27) and 81(3x27)
>> shift shift 108 ENTER 81 GCD << (answer : 27)

-- To find the number of combinations of 4 out of 10
>> shift shift 10 ENTER 4 COMB << (answer : 210)

-- To convert 5 newton to pound force
>> 5 Conv(select Force : N to lbf) << (answer : 1.124)

2. GUIDE demonstrates many more examples of complex numbers, fractions, DMS/HMS, vector, TVM, cash flow, bond, and statistical calculations. GUIDE can be accessed directly or indirectly from the Action Bar.

3. If you are reviewing the GUIDE, please try the problem and solution: What is 0.34444444 ... ? This is the author's favourite. By the way it also shows how to get the next better approximation than 22/7 for PI.

4. Includes a complete built-in user manual in 3 parts - GUIDE, KEYS, and GLOSSARY

5. A free tool for self-learners, students, and calculator enthusiasts. A modest addition to the many free learning resources made available to the public by generous individuals and organizations.