| MathFun {base} | R Documentation |
Miscellaneous Mathematical Functions
Description
abs(x) computes the absolute value of x, sqrt(x) computes the
(principal) square root of x, \sqrt{x}.
The naming follows the standard for computer languages such as C or Fortran.
Usage
abs(x)
sqrt(x)
Arguments
x |
a numeric or |
Details
These are internal generic primitive functions: methods
can be defined for them individually or via the
Math group generic. For complex
arguments (and the default method), z, abs(z) ==
Mod(z) and sqrt(z) == z^0.5.
abs(x) returns an integer vector when x is
integer or logical.
S4 methods
Both are S4 generic and members of the
Math group generic.
References
Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.
See Also
Arithmetic for simple, log for logarithmic,
sin for trigonometric, and Special for
special mathematical functions.
‘plotmath’ for the use of sqrt in plot annotation.
Examples
require(stats) # for spline
require(graphics)
xx <- -9:9
plot(xx, sqrt(abs(xx)), col = "red")
lines(spline(xx, sqrt(abs(xx)), n=101), col = "pink")