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FEEN OMNI-CALCULATOR

Emulating HP-48GX • TI-89 • HP-12C • MATLAB • Python

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HP-48GX / HP-50g RPN Emulator

Uses Reverse Polish Notation (Stack Logic). Enter number -> Press ENTER -> Enter number -> Press Operator.

4: \n3: \n2: \n1: 0

Functions

• RPN: No parentheses needed.
• Complex: Supports `a + bi`.

RPN Logic Explanation

In standard algebra (TI/Casio), you write $$ 3 + 4 $$. In RPN (HP), you write:

3 [ENTER] 4 [+]

Why? It eliminates the need for parentheses in complex equations like $$ (3+4) \times (5+6) $$, making it faster for engineering.

HP-12C / BA II Plus TVM Solver

Time Value of Money (TVM) Solver. Enter 4 known values to solve for the 5th.

N (Periods)

I% (Interest/Yr)

PV (Present Val)

PMT (Payment)

FV (Future Val)

Result: ---

Financial Formulas

Compound Interest Formula: $$ FV = PV \times (1 + \frac{i}{100})^n + PMT \times \frac{(1 + \frac{i}{100})^n - 1}{i/100} $$

Cash Flow (NPV): Used in BA II Plus Professional for investment appraisal.

TI-89 Titanium / TI-Nspire CAS Mode

Symbolic computation supported by Math.js.

Ready.

ƒ(x) =

Calculus & Algebra

Derivative: $$ \frac{d}{dx} x^n = nx^{n-1} $$

Integration: $$ \int x^n dx = \frac{x^{n+1}}{n+1} + C $$

MATLAB / Python / R Simulator

Command Line Interface for Statistics and Matrix Operations.

>> FEEN Analytic Engine v1.0 >> Emulating MATLAB/Python SciPy Environment >> Type 'help' for commands.

Statistical Logic

Standard Deviation (MATLAB `std`): $$ \sigma = \sqrt{\frac{1}{N-1} \sum (x_i - \bar{x})^2} $$

Regression (Python `scipy.stats`): Minimizes Sum of Squared Errors (SSE).

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