abs(x) computes the absolute value of x, sqrt(x) computes the
(principal) square root of x, √{x}.
The naming follows the standard for computer languages such as C or Fortran.
Usage
abs(x)
sqrt(x)
Arguments
x
a numeric or complex vector or array.
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")
Results
R version 3.3.1 (2016-06-21) -- "Bug in Your Hair"
Copyright (C) 2016 The R Foundation for Statistical Computing
Platform: x86_64-pc-linux-gnu (64-bit)
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Type 'license()' or 'licence()' for distribution details.
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Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
Type 'q()' to quit R.
> library(base)
> png(filename="/home/ddbj/snapshot/RGM3/R_rel/result/base/MathFun.Rd_%03d_medium.png", width=480, height=480)
> ### Name: MathFun
> ### Title: Miscellaneous Mathematical Functions
> ### Aliases: abs sqrt
> ### Keywords: math
>
> ### ** 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")
>
>
>
>
>
> dev.off()
null device
1
>