subscript operator for 'parameters' objects
1 2 | ## S3 method for class 'parameters'
parameters[...]
|
one can use all.equal to extract rows. Row's represent
the underlying grid of covariates. Covariates cannot be compared with
== operator, since they are numeric. Therefore one prefers
all.equal for 'near equality'. Using all.equal
will either result in a character TRUE or message,
therefore we have to check if it's a character, if so, we extract indexes
where TRUE stays and use those for indexing. Drawback of this is slowness!
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