applyConversions {compareMCMCs} | R Documentation |
Create transformed parameters from original parameters in MCMC output
applyConversions(samples, conversions)
samples |
One of: an |
conversions |
One of: a list of conversion specifications (see
below); a named list of conversion specifications, with names
matching those of a list provided for |
A conversion specification is a named list. For each element:
its name will be the name of a new column appended to a samples
matrix.
its value should be a character string that can be parsed as code
to calculate elements of the new column. It can use existing
column names in samples
. Calculations will be done row-wise.
Column names are often something like "beta[2]". To have this
used as a name, enclose it in backticks, e.g. "`beta[2]`
".
For example, an entry could be log_beta2 = "log(`beta\[2\]`)"
.
A list value of NULL
will remove the named column.
The conversion specification list will be processed in order. This allows creating new columns and removing old ones in a sensible order.
If both conversions
and samples
are named lists, they will be
matched: the conversions
element (itself a list of conversion
specifications) used on a samples
element will have the same
name. If there is no conversions
element for a given samples
element, that samples
element will be included in the returned
list without any conversions.
An object of the same type as samples
after application
of conversions.