abs {base} | R Documentation

## Miscellaneous Mathematical Functions

### Description

These functions compute miscellaneous mathematical functions. 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 generic 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`.

### 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.

### Examples

    require(stats) # for spline
    xx <- -9:9
    plot(xx, sqrt(abs(xx)),  col = "red")
    lines(spline(xx, sqrt(abs(xx)), n=101), col = "pink")

[Package base version 2.3.1 Index]