xpoint, ypoint, and zpoint are real numbers that set the x-, y-, and z-coordinates as the eye-point from which to view a 3D plot’s view volume. The y-coordinate must always be 1 unit less than the view

volume’s nearest point (ynear of YVOL). These coordinates are stored in the reserved variable VPAR.

Access: …µEYEPT

Input/Output:

Level 3/Argument 1

Level 2/Argument 2

Level 1/Argument 3

Level 1/Item 1

 

 

 

 

xpoint

ypoint

zpoint

→

See also: NUMX, NUMY, XVOL, XXRNG, YVOL, YYRNG, ZVOL

F0λ

Type: Function

Description: Black Body Emissive Power Function: Returns the fraction of total black-body emissive power at

temperature xT between wavelengths 0 and ylambda. If units are not specified, ylambda has implied units of meters and xT has implied units of K.

F0λ returns a dimensionless fraction.

Access:

…µF0λ

 

 

 

 

Flags:

Numerical Results (–3)

 

 

 

Input/Output:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Level 2/Argument 1

Level 1/Argument 2

 

Level 1/Item 1

 

 

 

 

 

 

 

 

ylambda

xT

→

xpower

 

 

y

lambda

'symb'

→

lambda

 

 

 

 

'F0λ(y ,symb)'

 

 

'symb'

xT

→

'F0λ(symb,xT)'

 

 

'symb1'

'symb2'

→

'F0λ(symb1,symb2)'

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FACT

Command

 

 

 

 

Type:

 

 

 

 

Description: Factorial (Gamma) Function: FACT is the same as ! and is provided for compatibility with the HP 28. See !.

Access: …µFACT

Flags: Numerical Results (–3), Underflow Exception (–20), Overflow Exception (–21)

Input/Output:

Level 1/Argument 1

 

Level 1/Item 1

 

 

 

n

→

n!

x

→

Γ(x + 1)

'symb'

→

'(symb)!'

 

 

 

See also:

COMB, PERM, !

 

 

 

FACTOR

Type: Command

Description: Factorizes a polynomial or an integer:

•The function expresses a polynomial as the product of irreducible polynomials.

•The function expresses an integer as the product of prime numbers.

Access: Algebra, …×or PALG or !ÞPOLY

3-82 Full Command and Function Reference