http://web.mit.edu/r/current/lib/R/library/base/html/options.html

• error:

• either a function or an expression governing the handling of non-catastrophic errors such as those generated bystop as well as by signals and internally detected errors.  If the option is a function, a call to that function, with no arguments, is generated as the expression.  The default value is NULL: see stop for the behaviour in that case.  The functions dump.frames andrecover provide alternatives that allow post-mortem debugging.  Note that these need to specified as e.g. options(error = utils::recover) in startup files such as ‘.Rprofile’.

# 在访问某些网站时，可能超时，出现错误。这时R无法继续执行下面的代码。

# 需要跳过错误，继续运行下面的代码。可以设置option(error=...)
# Will continue to execute script even after error, when options()$error is not NULL
options(error = function(){cat('continue to execute script even after error.\n')})

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