Arith function

Arithmetic methods for class "frab"

The frab class provides basic arithmetic methods for frab objects. Arithmetic operations are generally dispatched to one of self-describing functions in the following list:

• frab_negative()
• frab_reciprocal()
• frab_plus_frab()
• frab_multiply_frab()
• frab_plus_numeric()
• frab_multiply_numeric()
• frab_power_numeric()
• numeric_power_frab()

The most important one is, of course, frab_plus_frab() which is the sine qua non for the whole package. But these functions are not intended for user and are somewhat unfriendly. Use the arithmetic operators, as in ‘a + 2*b’ instead.

Low-level helper functions c_frab_add() and c_frab_multiply() etc. are generated by compileAttributes(). They call the routines in the src directory. Low-level helper function c_frab_pmax() is documented here for consistency; but technically c_frab_pmax() is an Extremes function. They are documented at Compare and pmax respectively.

frab_negative(x)
frab_reciprocal(x)
frab_plus_frab(F1,F2)
frab_multiply_numeric(e1,e2)
frab_power_numeric(e1,e2)
numeric_power_frab(e1,e2)
frab_unary(e1,e2)
frab_arith_frab(e1,e2)
frab_plus_numeric(e1,e2)
frab_arith_numeric(e1,e2)
numeric_arith_frab(e1,e2)

Arguments

• e1,e2,x,F1,F2: Objects of class frab, coerced if needed

Methods

• Arith: signature(e1="frab" , e2="missing"): blah blah blah
• Arith: signature(e1="frab" , e2="frab" ): ...
• Arith: signature(e1="frab" , e2="numeric"): ...
• Arith: signature(e1="numeric", e2="frab" ): ...
• Arith: signature(e1="ANY" , e2="frab" ): ...
• Arith: signature(e1="frab" , e2="ANY" ): ...

Author(s)

Robin K. S. Hankin

Note

There are a few peculiarities in the methods. Function frab_plus_numeric(e1,e2) assumes e1 is a frab and e2 is numeric. But if e2 is a named vector, it is coerced to a frab; if not, a [simulated] list("disordR") violation is raised.

Returns

Return frab objects

See Also

Compare

Examples

(x <- frab(c(a=1,b=2,c=3)))
(y <- frab(c(b=-2,d=8,x=1,y=7)))
(z <- frab(c(c=2,x=5,b=1,a=6)))

x+y
x+y+z

x*y