Methods for Function Arith in package Brobdingnag

Methods for Arithmetic functions in package Brobdingnag: +, -, *, /, ^

Author

Robin K. S. Hankin

Note

The unary arithmetic functions (viz “+” and “-”) do no coercion.

The binary arithmetic functions coerce numeric <op> brob to brob; and numeric <op> glub, complex <op> brob, and brob <op> glub, to glub.

Examples

x <- as.brob(1:10)
y <- 1e10

x+y
#>  [1] +exp(23.026) +exp(23.026) +exp(23.026) +exp(23.026) +exp(23.026)
#>  [6] +exp(23.026) +exp(23.026) +exp(23.026) +exp(23.026) +exp(23.026)

as.numeric((x+y)-1e10)
#>  [1]  0.9999823  2.0000002  2.9999825  4.0000003  4.9999827  6.0000005
#>  [7]  6.9999828  8.0000007  8.9999830 10.0000008

x^(1/y)
#>  [1] +exp(0)          +exp(6.9315e-11) +exp(1.0986e-10) +exp(1.3863e-10)
#>  [5] +exp(1.6094e-10) +exp(1.7918e-10) +exp(1.9459e-10) +exp(2.0794e-10)
#>  [9] +exp(2.1972e-10) +exp(2.3026e-10)