logmdigamma: Log Minus Digamma Function
In statmod: Statistical Modeling
logmdigamma R Documentation
Log Minus Digamma Function
Description
The difference between the log and digamma functions.
Usage
logmdigamma(x)
Arguments
x
numeric vector or array of positive values. Negative or zero values will return NA.
Details
digamma(x) is asymptotically equivalent to log(x). logmdigamma(x) computes log(x) - digamma(x) without subtractive cancellation for large x.
Author(s)
Gordon Smyth
References
Abramowitz, M., and Stegun, I. A. (1970). Handbook of
mathematical functions. Dover, New York.
See Also
digamma
Examples
log(10^15) - digamma(10^15) # returns 0
logmdigamma(10^15) # returns value correct to 15 figures
statmod documentation built on Jan. 6, 2023, 5:14 p.m.
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| logmdigamma | R Documentation |
Log Minus Digamma Function
Description
The difference between the log and digamma functions.
Usage
logmdigamma(x)
Arguments
x |
numeric vector or array of positive values. Negative or zero values will return |
Details
digamma(x) is asymptotically equivalent to log(x). logmdigamma(x) computes log(x) - digamma(x) without subtractive cancellation for large x.
Author(s)
Gordon Smyth
References
Abramowitz, M., and Stegun, I. A. (1970). Handbook of mathematical functions. Dover, New York.
See Also
digamma
Examples
log(10^15) - digamma(10^15) # returns 0 logmdigamma(10^15) # returns value correct to 15 figures
R Package Documentation
Browse R Packages
We want your feedback!
Note that we can't provide technical support on individual packages. You should contact the package authors for that.
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