I slightly simplified the rules that govern syntactic names. Why is .123e1 not a syntactic name? Read ?make.names for the full details.
Question
Why is .123e1 not a syntactic name?
I slightly simplified the rules that govern syntactic names. Read ?make.names for the full details.
Solution
The string ".123e1" is not a syntactic name in R because it does not follow the rules for syntactic names in R. According to the documentation for make.names in R, a syntactic name consists of letters, numbers and the dot or underline characters and starts with a letter or the dot not followed by a number.
Here is the step by step explanation:
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The string ".123e1" starts with a dot, which is allowed in R.
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However, the dot is immediately followed by a number (1), which is not allowed in R.
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Therefore, ".123e1" is not a syntactic name in R.
For it to be a syntactic name, it could be changed to something like ".e1231" or "X.123e1".
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