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Can dplyr package be used for conditional mutating?
...3 <- BASE_fun(DF))
# user system elapsed
# 11.676 1.530 13.319
identical(as.data.frame(ans1), as.data.frame(ans2))
# [1] TRUE
identical(as.data.frame(ans1), as.data.frame(ans3))
# [1] TRUE
Not sure if this is an alternative you'd asked for, but I hope it helps.
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How can I perform a culture-sensitive “starts-with” operation from the middle of a string?
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I'll consider the problem of many<->one/many casemappings first and separately from handling different Normalization forms.
For example:
x heiße y
^--- cursor
Matches heisse but then moves cursor 1 too much. And:
x heiss...
How do I iterate through children elements of a div using jQuery?
...nput elements in it... I'd like to iterate through each of those elements. Ideas?
7 Answers
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How to write a simple database engine [closed]
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I recommend to read code of SQLite 2.5.0: github.com/davideuler/SQLite-2.5.0-for-code-reading, it is an early version of SQLite which can be compiled and run on modern GCC (I've tested it on MacOS 10.13 and Debian 8)
– david euler
Mar 17 '18 ...
How can we match a^n b^n with Java regex?
...nting".
Rather than immediately giving out the pattern, this answer will guide readers through the process of deriving it. Various hints are given as the solution is slowly constructed. In this aspect, hopefully this answer will contain much more than just another neat regex pattern. Hopefully reade...
Is there a way to make AngularJS load partials in the beginning and not at when needed?
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Thanks for the reply. I like the template cache Idea because I do not want to put things into a script tag. How to use it? Documentation is bad. I saw the fiddle in one of the comments there. But I want to load from a url.
– Ranjith Ramachandra
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Why is a round-trip conversion via a string not safe for a double?
...ber is pretty simple -- it just calls _ecvt, which is in the C runtime:
void DoubleToNumber(double value, int precision, NUMBER* number)
{
WRAPPER_CONTRACT
_ASSERTE(number != NULL);
number->precision = precision;
if (((FPDOUBLE*)&value)->exp == 0x7FF) {
number->...
AutoMapper: “Ignore the rest”?
... Thanks!! I found this very handy. Ignoring properties individually was defeating the purpose of using automapper in my situation.
– Daniel Robinson
Jul 8 '11 at 15:08
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What is the combinatory logic equivalent of intuitionistic type theory?
...et Type Theory
For completeness' sake, I'll present the rules. Context validity just says you can build contexts from empty by adjoining fresh variables inhabiting Sets.
G |- valid G |- S : Set
-------------- ----------------------------- x fresh for G
. |- valid ...
MySQL InnoDB not releasing disk space after deleting data rows from table
... contains about 2M data rows. When I deleted data rows from the table, it did not release allocated disk space. Nor did the size of the ibdata1 file reduce after running the optimize table command.
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