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R and regexp: Extract name source from news

I have a scrap news by R like the following: > View(mydf$title) <name of the news> <dash> <source name>[详细]

2023-04-13 04:15 分类：问答
ggplot2 and sweave - plot is in Rplots instead of main pdf?

I\'ve been following the examples on similar posts, but to no avail. Here is an example of the problem I\'m seeing.[详细]

2023-04-13 04:09 分类：问答
R equivalent to diag(x,k) in matlab

I guess, I have a two leveled question referring to diag in R and matlab. 1) I was wondering if there was a way already developed to access different diagonals of matrices in R similar to the way it[详细]

2023-04-13 02:18 分类：问答
Roxygen2 introduces \n to default parameter value. Causes Codoc mismatches

I\'m having the opposite issues of this post. It seems that roxygen is introducing \\n into my default parameter values which causes R CMD check to WARN[详细]

2023-04-13 01:19 分类：问答
RODBC fails: "invalid character value for cast specification" - Excel 2007

I\'m trying to use RODBC to write to an Excel2007 file and I keep getting errors.I\'ve reduced the issue to this very basic case, a 1-row data.frame with character, numeric, Date, and logical datatype[详细]

2023-04-13 01:12 分类：问答
Validate a character as a file path?

What\'s the best way to determine if a character is a valid file path?So CheckFilePath( \"my*file.csv\") would return FALSE (on windows * is invalid character), where开发者_如何学Goas CheckFilePath( \[详细]

2023-04-13 00:54 分类：问答
Extract file extension from file path

How can I extract the extension of a file given a file path as a character?I know I can do this via regular expression regexpr(\"\\\\.([[:alnum:]]+)$\", x), but wondering if there\'s a built-in funct开[详细]

2023-04-13 00:53 分类：问答
Including multiple conditions in for-loop

I am trying to specify two conditions as a part of a for loop. It seems like the second condition in the second for loop is not being considered. My code runs this way:[详细]

2023-04-13 00:09 分类：问答
Adding a table of contents to PDF with R plots

I\'m creating a larger number of plots in R and save them as PDF (using grDevices / pdf). Is there an easy way to add a (meta-data) table of contents to the PDF as it is created?[详细]

2023-04-12 23:21 分类：问答
Rearrange an R data frame like an Excel PivotTable

I have the following data frame in R: > str(x2) \'data.frame\':262064 obs. of15 variables: $ ykod : int99 99 99 99 99 99 99 99 99 99 ...[详细]

2023-04-12 21:51 分类：问答