R: Log functions

Log {gsl} | R Documentation

## Log functions

### Description

Log functions as per the Gnu Scientific Library, reference manual section 7.25 and AMS-55, chapter 4. These functions are declared in header file `gsl_sf_log.h`

### Usage

    gsl_sf_log(x, give=FALSE, strict=TRUE)
    log_abs(x, give=FALSE, strict=TRUE)
    complex_log(zr, zi=NULL, r.and.i=TRUE, give=FALSE, strict=TRUE)
    log_1plusx(x, give=FALSE, strict=TRUE)
    log_1plusx_mx(x, give=FALSE, strict=TRUE)

### Arguments

`x` | input: real values
`zr` | In `complex_log()`, the real part of the argument
`zi` | In `complex_log()`, the imaginary part of the argument. If missing (ie takes the default value of `NULL`), interpret `zr` as complex, even if real
`r.and.i` | In `complex_log()`, Boolean variable with default value of `TRUE` meaning to return a complex variable as per the details section below; and `FALSE` meaning to return the values as advertised in the GSL manual
`give` | Boolean with `TRUE` meaning to return a list of three items: the value, an estimate of the error, and a status number
`strict` | Boolean, with `TRUE` meaning to return `NaN` if status is an error

### Author(s)

Robin K. S. Hankin

### References

http://www.gnu.org/software/gsl

### Examples

    x <- seq(from=0.1,to=2,by=0.01)
    log(x)   #table 7.5 of Ab and St

[Package gsl version 1.9-10.3 Index]