illegal-characters | 易学教程

Why am I getting X. in my column names when reading a data frame?

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I asked a question about this a few months back , and I thought the answer had solved my problem, but I ran into the problem again and the solution didn't work for me. I'm importing a CSV: orders <- read.csv("<file_location>", sep=",", header=T, check.names = FALSE) Here's the structure of the dataframe: str(orders) 'data.frame': 3331575 obs. of 2 variables: $ OrderID : num -2034590217 -2034590216 -2031892773 -2031892767 -2021008573 ... $ OrderDate: Factor w/ 402 levels "2010-10-01","2010-10-04",..: 263 263 269 268 301 300 300 300 300 300 ... If I run the length command on the first column,

Specifying column names in a data.frame changes spaces to “.”

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问题 Let's say I have a data.frame, like so: x <- c(1:10,1:10,1:10,1:10,1:10,1:10,1:10,1:10,1:10,1:10) df <- data.frame("Label 1"=x,"Label 2"=rnorm(100)) head(df,3) returns: Label.1 Label.2 1 1 1.9825458 2 2 -0.4515584 3 3 0.6397516 How do I get R to stop automagically replacing the space with a period in the column name? ie, "Label 1" instead of "Label.1". 回答1: You don't. With the space you desire the format would not satisfy the requirements for an identifier that come to play when you use df

Why am I getting X. in my column names when reading a data frame?

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问题 I asked a question about this a few months back, and I thought the answer had solved my problem, but I ran into the problem again and the solution didn\'t work for me. I\'m importing a CSV: orders <- read.csv(\"<file_location>\", sep=\",\", header=T, check.names = FALSE) Here\'s the structure of the dataframe: str(orders) \'data.frame\': 3331575 obs. of 2 variables: $ OrderID : num -2034590217 -2034590216 -2031892773 -2031892767 -2021008573 ... $ OrderDate: Factor w/ 402 levels \"2010-10-01\"

What characters allowed in file names on Android?

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What special characters are allowed for file names on Android? ~!@#$%^&*()_+/\., Also, can I save file with Unicode name? On Android (at least by default) the file names encoded as UTF-8. Looks like reserved file name characters depend on filesystem mounted ( http://en.wikipedia.org/wiki/Filename ). I considered as reserved: private static final String ReservedChars = "|\\?*<\":>+[]/'"; According to wiki and assuming that you are using external data storage which has FAT32. Allowable characters in directory entries are Any byte except for values 0-31, 127 (DEL) and: " * / : < > ? \ | + , . ; =

What characters allowed in file names on Android?

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问题 What special characters are allowed for file names on Android? ~!@#$%^&*()_+/\\., Also, can I save file with Unicode name? 回答1: On Android (at least by default) the file names encoded as UTF-8. Looks like reserved file name characters depend on filesystem mounted (http://en.wikipedia.org/wiki/Filename). I considered as reserved: private static final String ReservedChars = "|\\?*<\":>+[]/'"; 回答2: According to wiki and assuming that you are using external data storage which has FAT32. Allowable

Invalid Characters in XML

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问题 I am working with some XML at the moment. I have nodes that hold strings like below: <node>This is a string</node> Some of the strings that I am passing to the nodes will have characters like &, #, $ etc. <node>This is a string & so is this</node> This is not valid due to the & I cannot wrap these strings in CDATA as they need to be as they are. I have tried looking online for a list of characters that cannot be put in XML nodes without being in a CDATA. Could anyone point me in the direction

No visible cause for “Unexpected token ILLEGAL”

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问题 I\'m getting this JavaScript error on my console: Uncaught SyntaxError: Unexpected token ILLEGAL This is my code: var foo = \'bar\'; It\'s super simple, as you can see. How could it be causing a syntax error? 回答1: The error When code is parsed by the JavaScript interpreter, it gets broken into pieces called "tokens". When a token cannot be classified into one of the four basic token types, it gets labelled "ILLEGAL" on most implementations, and this error is thrown. The same error is raised