CLOUD . R-PROJECT . ORG {}

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We are analyzing https://cloud.r-project.org/web/packages/data.table/vignettes/datatable-faq.html.

Title:
Frequently Asked Questions about data.table
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Website Age:
25 years and 8 months (reg. 1999-10-27).

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🚄 Respectable Traffic: 10k - 20k visitors per month

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How Does Cloud.r-project.org Make Money? {💸}

The income method remains a mystery to us.

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Keywords {🔍}

datatable, column, columns, dataframe, rows, function, names, key, package, return, group, change, work, returns, true, syntax, vector, base, expression, false, row, table, method, number, num, inside, default, code, integer, int, null, single, error, subset, called, dispatch, dont, grouping, faster, call, variables, print, join, changed, data, list, isnt, sumfoobar, works, order,

Topics {✒️}

accept varying inputs os-specific libraries posting guide tells submit pull requests extra programming effort algorithm supports logical src/main/names src/main/eval binary file loses frequently asked questions links rapidly descend programming languages call preferred maximum performance including unknown future earlier memory corruption basic s3 dispatch break existing code radix sort algorithm internally forces visibility invalid argument names minimising page fetches printed telephone directory produce wrong results matrix single-row subset upper case null code readability reasons probable intention automatically binary search tests internal bind code places helps build dt[somecol == someval coerced numeric rhs columns enjoy standard column names directly myresult = colacolb/2 smaller syntax differences unusable matrix output generally bad practice avoid accidental printing general knowledge base r-internals section 1 s3 dispatch internally radix sort code efficiently implemented internally introduced compatibility issues join inherited scope considered core documentation earth-shatteringly simple guarantee row order table operates similar

Questions {❓}

1 How can I avoid writing a really long j expression?
10 Inside each group, why are the group variables length-1?
10 Why does X[Y] return all the columns from Y too?
11 Only the first 10 rows are printed, how do I print more?
11 What is the difference between X[Y] and merge(X, Y)?
12 Anything else about X[Y, sum(foo*bar)]?
12 With an X[Y] join, what if X contains a column called "Y"?
15 Can base be changed to do this then, rather than a new package?
2 Why is the default for mult now "all"?
21 Why does DT[i, col := value] return the whole of DT?
23 Why do I have to type DT sometimes twice after using := to print the result to console?
3 Is it available for Linux, Mac and Windows?
3 Why does DT[, region] return a vector for the “region” column?
3 Why is grouping by columns in the key faster than an ad hoc by?
3 appears to be missing from the CRAN archive?
4 Why does DT[ , x, y, z] not work?
6 Why has the DT() alias been removed?
7 Where are the datatable-help archives?
8 I’d prefer not to post on the Issues page, can I mail just one or two people privately?
8 What are the scoping rules for j expressions?
8 Why are the defaults the way they are?
9 Can I trace the j expression as it runs through the groups?
9 Isn’t this already done by with() and subset() in base?
Can I do that easily?
Can we do the same with names?
Exercise for reader: does it then ripple up the calling frames, or go straight to globalenv()?
Happily, an internet search for “How does R method dispatch work” (at the time of this writing) returns the ?
How did you manage to change it given that users depended on the old behaviour?
How do I get it to look up the column name contained in the mycol variable?
How do I stop that?
How do I warn others about my experience?
How is this possible?
I know the r-help posting guide tells me to contact the maintainer (not r-help), but is there a larger group of people I can ask?
Isn’t X[Y, sum(foo*bar)] quicker to program and quicker to run than a merge of everything wastefully followed by a subset?
It outperforms all other methods, but there are some caveats (see ?
Manual: ?
SD before using it, or returning it, and don’t wish to modify DT using :=, then take a copy first (see ?
What can I do?
What does UseMethod do?
What if we want row names and column names that aren’t character but integer or float?
What was so difficult about the result of DT[i, col := value] being returned invisibly?
Why is an expression of one column so quick?
Why is that?
Why merge all the columns of data, only to use a small subset of them afterwards?
You might now ask: where is this documented in R?
Frame in R?
Frame works?
Frame, and base::cbind and base::rbind (uniquely) do their own S3 dispatch internally as documented by ?
Frame?
Table compatible with S-plus?
Table is inspired by A[B] syntax in base?
Table queries?
Table rather than a vector?
Table the same as DT[0]?
Table) but how does R know how to dispatch?
Table?

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