HP49G / HP49G+ Tutorials

 

Part 2 - Data Entry

 

Other Tutorials Here

 

Now everything is setup, how do we use this thing?

 

RPN Usage Examples

 

RPN is a handy method for entering formula. It is not the only way - there is also Standard Algebraic (used in TI calculators) and the Equation Writer (handy for entering equations exactly as you see them on paper)

RPN is where you enter the numbers, then press the operators. Why on earth would you want to do this?

 

Note: Calculations are done in Symbolic Exact mode for clarity. If Numeric mode is set, there is no need to press ->Num but calculations are harder to follow.

Example One:

 

Find 1 / ( 1/5 + 1/6 + 1/7) (Equivalent Resistance of 5 , 6, 7 Ohm resistors in Parallel)

 

 

Empty Stack - Just turned it on

Press 5

Press 1/x key

Press 6

Press 1/x key

Press 7

Press 1/x key

Press +

Press +

Press 1/x key

Press ->Num To give an inexact numerical result

 

Example 2: Find e^ (root 2) / ( e^ (root 2) + 1 )

 

Press 2

Press square root key

Press e^x key

Press ENTER to make a copy of the Top of Stack - Copy e^ (Root 2 )

Press 1

Press +

Press Divide

Press ->Num To give an inexact numerical result

 

Example 3: Find the derivative of Cos(Sin(x)) with respect to X

 

Press X

Press Sin

Press Cos

Press 'Shift 4' To bring up the calculous menu

Press 'DERVX' Softkey (find Derivative with Respect to X)

 

If you make a mistake, simply hit the 'undo' key.

 

Algebraic Entry

OK, so that's great, but what if you want to enter an expression algebraically? Easily done. If you are in RPN mode, press the '' (tick) key, and type your formula as you would on a normal calculator.

 

 

The Equation Writer

But the Equation Writer is the best way to copy expressions from paper. Suppose you wish to integrate sin(x) with respect to X between 0 and Pi.

 

Press 'EQW' To start the Equation Writer

Press the Definite Integral Key

Use the cursor to fill in the bounds

Move the cursor and fill in the expression

Enter 'Respect to X'

Press ENTER to put it on the stack

Press 'EVAL' for the answer.

 See The Other Tutorials Here