Turn unevaluated expressions into character strings.
at which line-breaking is tried. |
enclosed in backticks if they do not follow the standard syntax. |
This function turns unevaluated expressions (where “expression” is taken in a wider sense than the strict concept of a vector of mode
“expression” used in
expression) into character strings (a kind of inverse
A typical use of this is to create informative labels for data sets and plots. The example shows a simple use of this facility. It uses the functions
substitute to create labels for a plot which are character string versions of the actual arguments to the function
The default for the
backtick option is not to quote single symbols but only composite expressions. This is a compromise to avoid breaking existing code.
control = “all” comes closest to making
deparse() an inverse of
parse(). However, not all objects are deparseable even with this option and a warning will be issued if the function recognizes that it is being asked to do the impossible.
To avoid the risk of a source attribute out of sync with the actual function definition, the source attribute of a function will never be deparsed as an attribute.
Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth \& Brooks/Cole.