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  tracing functions;
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  tracing functions;
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  also, \code{\link{quote}} and \code{\link{substitute}} for
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  also, \code{\link{quote}} and \code{\link{substitute}} for
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  constructing general expressions.
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  constructing general expressions.
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}
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}
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\examples{
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\examples{
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\dontshow{ hasMethods <- .isMethodsDispatchOn()}
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if(.isMethodsDispatchOn()) { # trace needs method package attached.
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f <- function(x, y) {
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f <- function(x, y) {
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    y <- pmax(y, .001)
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    y <- pmax(y, .001)
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    x ^ y
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    x ^ y
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}
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}
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trace("as.matrix", recover)
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trace("as.matrix", recover)
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## turn off the tracing
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## turn off the tracing
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untrace(c("f", "as.matrix"))
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untrace(c("f", "as.matrix"))
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}
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if(!hasMethods) detach("package:methods")
 - 
 
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}
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}
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\keyword{programming}
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\keyword{programming}
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\keyword{debugging}
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\keyword{debugging}