frexp {accuracy} | R Documentation

## Function to convert vector of floating-point numbers to fractional and integral components

### Description

The frexp() function returns a matrix with the normalized fraction [.5,1) of the vector in the first column and the exponent (a power of two) in the second column. (If x is zero, then the normalized fraction is zero and zero is stored in the exponent.)

### Usage

            frexp(v)

### Arguments

`v` | vector of doubles

### Details

This is an R wrapper around the <math.h> frexp() function.

### Value

Returns a 2xn matrix. Thethe normalized fraction [.5,1) of x is the first column and the exponent (a power of two) in the second column. (If x[i] is zero, then the normalized fraction of x[i] is zero and zero is stored in the exponent.)

### Author(s)

Micah Altman Micah_Altman@harvard.edu http://www.hmdc.harvard.edu/micah_altman/

### References

Altman, M., J. Gill and M. P. McDonald. 2003. Numerical Issues in Statistical Computing for the Social Scientist. John Wiley & Sons. http://www.hmdc.harvard.edu/numerical_issues/

### Examples

    x = runif(10)
    y = frexp(x)
    y
    # this is now true by construction
    x==y[,1] *2^y[,2]

[Package accuracy version 1.35 Index]