Casio CFX-9800G
Datasheet legend
Ab/c:
Fractions calculation
AC: Alternating current BaseN: Number base calculations Card: Magnetic card storage Cmem: Continuous memory Cond: Conditional execution Const: Scientific constants Cplx: Complex number arithmetic DC: Direct current Eqlib: Equation library Exp: Exponential/logarithmic functions Fin: Financial functions Grph: Graphing capability Hyp: Hyperbolic functions Ind: Indirect addressing Intg: Numerical integration Jump: Unconditional jump (GOTO) Lbl: Program labels LCD: Liquid Crystal Display LED: Light-Emitting Diode Li-ion: Lithium-ion rechargeable battery Lreg: Linear regression (2-variable statistics) mA: Milliamperes of current Mtrx: Matrix support NiCd: Nickel-Cadmium rechargeable battery NiMH: Nickel-metal-hydrite rechargeable battery Prnt: Printer RTC: Real-time clock Sdev: Standard deviation (1-variable statistics) Solv: Equation solver Subr: Subroutine call capability Symb: Symbolic computing Tape: Magnetic tape storage Trig: Trigonometric functions Units: Unit conversions VAC: Volts AC VDC: Volts DC |
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The CFX-9800G is a recent member of Casio's line of color graphing calculators. It is a "do-everything" calculator in the same league as the Hewlett-Packard HP-48SX.
Or perhaps not quite in the same league. The color display of the CFX-9800G is truly impressive, but its operating paradigm is much less sophisticated. Different data types and areas of functionality are not well integrated. For instance, trigonometric and transcendental functions are not defined for complex arguments, or arguments that would yield complex results. It also appears impossible to create a graph from the results of a user-defined program(not a function.)
The listing below is a program that calculates the Gamma function for any real argument (it would work for complex arguments as well, were it not for the lack of complex support in the built-in exponential and logarithmic functions.) This program, I believe, can be used in unaltered form on many Casio calculators and clones.
"X=":? -> X 1 -> Y Lbl 1 X >= 0 => Goto 2 X×Y -> Y:X+1 -> X Goto 1 Lbl 2 e(ln ((1+(76.18009172+9.5E-9)/(X+1) -86.50532033/(X+2)+24.01409824/(X+3) -1.231739572/(X+4)+1.208650973E-3/(X+5) -5.395239384E-6/(X+6))× √(π×2)/X)+(X+.5)× ln (X+5.5)-X-5.5)/Y