constant {rv}R Documentation

Constant Vectors

Description

Tests or coerces objects that are non-random.

Usage

 is.constant(x)
 ## S3 method for class 'rv':
 is.constant(x)
 ## Default S3 method:
 is.constant(x)
 ## S3 method for class 'rvsim':
 is.constant(x)
 as.constant(x)
 ## S3 method for class 'rvsim':
 as.constant(x)
 ## S3 method for class 'rv':
 as.constant(x)

Arguments

x an object, random variable (rv) or not

Details

is.constant returns TRUE for each component of the argument object if the implied variance (sample variance of the simulations) is zero or if there is only one simulation (that is, the variable is ``constant").

Author(s)

Jouni Kerman kerman@stat.columbia.edu http://www.stat.columbia.edu/~kerman

References

Kerman, Jouni and Gelman, Andrew. Manipulating and Summarizing Posterior Simulations Using Random Variable Objects. Technical report, Columbia University, New York.

Examples

  is.constant(1)         # TRUE
  is.constant(rvnorm(1)) # FALSE

[Package rv version 0.911 Index]