write.model: Convert function to a MultiBUGS model file

Description Usage Arguments Details Value Author(s) See Also Examples

View source: R/write.model.R

Description

BUGS models follow closely S syntax. It is therefore possible to write most BUGS models as functions.

Usage

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write.model(model, con = "model.bug", digits = 5)

Arguments

model

function containing the BUGS model in the BUGS model language, for minor differences see Section Details.

con

passed to writeLines which actually writes the model file

digits

number of significant digits used for MultiBUGS input, see formatC

Details

As a difference, BUGS syntax allows truncation specification like this: dnorm(...) I(...) but this is illegal in R. To overcome this incompatibility, use dummy operator %_% before I(...): dnorm(...) %_% I(...). The dummy operator %_% will be removed before the BUGS code is saved.

Value

Nothing, but as a side effect, the model file is written

Author(s)

original idea by Jouni Kerman, modified by Uwe Ligges

See Also

bugs

Examples

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## Same 'schoolsmodel' that is used in the examples in ?bugs:
schoolsmodel <- function(){
    for (j in 1:J){
        y[j] ~ dnorm (theta[j], tau.y[j])
        theta[j] ~ dnorm (mu.theta, tau.theta)
        tau.y[j] <- pow(sigma.y[j], -2)
    }
    mu.theta ~ dnorm (0.0, 1.0E-6)
    tau.theta <- pow(sigma.theta, -2)
    sigma.theta ~ dunif (0, 1000)
}

    ## some temporary filename:
    filename <- file.path(tempdir(), 'schoolsmodel.bug')

## write model file:
write.model(schoolsmodel, filename)
## and let's take a look:
file.show(filename)

MultiBUGS/R2MultiBUGS documentation built on April 18, 2019, 11:57 p.m.