If you create a non-valid variable name (using assign, perhaps), then you need to access it with backquotes, assign("x y", 0) ?make.names describes what constitutes a valid variable name. Using non-standard variable names without backquotes # Error: unexpected input in "path.expand(“" So-called "smart" quotes are not so smart for R programming. Alternatively, you can use single quotes inside a double quoted string without escaping, and vice versa. Likewise, single quotes inside a single quoted string need to be escaped. This is a common problem when trying to pass quoted values to the shell via system, or creating quoted xPath or sql queries.ĭouble quotes inside a double quoted string need to be escaped. # Error: unexpected ')' in "path.expand(~)" They need to be wrapped in double or single quotes. # Error: unexpected numeric constant in "c(1 2"įile paths are just strings. When calling a function, each argument must be separated by a comma. If you have nested parentheses, braces or brackets it is very easy to close them one too many or too few times. Mismatched parentheses, braces or brackets In RStudio, the keyboard shortcut CTRL + SHIFT + A will reformat your code.Ĭonsider using an IDE or text editor that highlights matching parentheses and braces, and shows strings and numbers in different colours.Ĭommon syntactic mistakes that generate these errors You can also use the formatR package to automatically format your code into something more readable. There are many R style guides linked from the SO R tag info page. That way, when you mistype things, the problem will be easier to spot. The best way to avoid syntactic errors is to write stylish code. Prophylactic measures to prevent you getting the error again Find that line in your original code, and look for the typo. The code provided in the error message shows where R thinks that the problem is. To fix the problem, read the error message carefully. These errors mean that the R code you are trying to run or source is not syntactically correct.
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