| Line 86... |
Line 86... |
| 86 |
actually occur (used, for example, by debugging functions to shut
|
86 |
actually occur (used, for example, by debugging functions to shut
|
| 87 |
off tracing during debugging).}
|
87 |
off tracing during debugging).}
|
| 88 |
\item{expr, msg}{arguments to the support function \code{.doTrace}, calls to
|
88 |
\item{expr, msg}{arguments to the support function \code{.doTrace}, calls to
|
| 89 |
which are inserted into the modified function or method:
|
89 |
which are inserted into the modified function or method:
|
| 90 |
\code{expr} is the tracing action (such as a call to
|
90 |
\code{expr} is the tracing action (such as a call to
|
| 91 |
\code{browser()}, and \code{msg} is a string identifying the
|
91 |
\code{browser()}), and \code{msg} is a string identifying the
|
| 92 |
place where the trace action occurs.
|
92 |
place where the trace action occurs.
|
| 93 |
}
|
93 |
}
|
| 94 |
\item{default}{If \code{returnValue} finds no return value (e.g.
|
94 |
\item{default}{If \code{returnValue} finds no return value (e.g.
|
| 95 |
a function exited because of an error, restart or as a result
|
95 |
a function exited because of an error, restart or as a result
|
| 96 |
of evaluating a return from a caller function), it will return
|
96 |
of evaluating a return from a caller function), it will return
|
| Line 126... |
Line 126... |
| 126 |
this case you probably want to supply \code{print = FALSE} in the call
|
126 |
this case you probably want to supply \code{print = FALSE} in the call
|
| 127 |
to \code{trace} also).
|
127 |
to \code{trace} also).
|
| 128 |
|
128 |
|
| 129 |
When the \code{at} argument is supplied, it can be a vector of
|
129 |
When the \code{at} argument is supplied, it can be a vector of
|
| 130 |
integers referring to the substeps of the body of the function (this
|
130 |
integers referring to the substeps of the body of the function (this
|
| 131 |
only works if the body of the function is enclosed in \code{{ ...}}. In
|
131 |
only works if the body of the function is enclosed in \code{{ ...}}). In
|
| 132 |
this case \code{tracer} is \emph{not} called on entry, but instead
|
132 |
this case \code{tracer} is \emph{not} called on entry, but instead
|
| 133 |
just before evaluating each of the steps listed in \code{at}. (Hint:
|
133 |
just before evaluating each of the steps listed in \code{at}. (Hint:
|
| 134 |
you don't want to try to count the steps in the printed version of a
|
134 |
you don't want to try to count the steps in the printed version of a
|
| 135 |
function; instead, look at \code{as.list(body(f))} to get the numbers
|
135 |
function; instead, look at \code{as.list(body(f))} to get the numbers
|
| 136 |
associated with the steps in function \code{f}.)
|
136 |
associated with the steps in function \code{f}.)
|
The R Project SVN
R