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Why is it wrong to use std::auto_ptr with standard containers?
Why is it wrong to use std::auto_ptr<> with standard containers?
6 Answers
6
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data.frame rows to a list
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Like this:
xy.list <- split(xy.df, seq(nrow(xy.df)))
And if you want the rownames of xy.df to be the names of the output list, you can do:
xy.list <- setNames(split(xy.df, seq(nrow(xy.df))), rownames(xy.df))
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Display / print all rows of a tibble (tbl_df)
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if you want don't want to worry about the value of n and you're already piping, you can use df %>% tbl_df %>% print(n = nrow(.))
– ClaytonJY
Aug 3 '16 at 15:57
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What is “vectorization”?
... ... some other ... but I've never found an explanation what does it mean, and what it does? So I'm asking here, what is vectorization, and what does it mean for example, that "a loop is vectorized" ?
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mysql update column with value from another table
... is perfect in this situation. I also used CONCAT_WS to merge pruduct name and SKU from another table
– vladkras
Jul 16 '14 at 5:43
2
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How to copy a collection from one database to another in MongoDB
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At the moment there is no command in MongoDB that would do this. Please note the JIRA ticket with related feature request.
You could do something like:
db.<collection_name>.find().forEach(function(d){ db.getSiblingDB('<new_database>')['<c...
Where is the documentation for the values() method of Enum?
...ted Jan 10 '19 at 5:02
Justin Standard
20.7k2222 gold badges7474 silver badges8989 bronze badges
answered Dec 1 '12 at 11:58
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Why use Dijkstra's Algorithm if Breadth First Search (BFS) can do the same thing faster?
...rce to every node in the traversed graph.
Meanwhile BFS basically just expands the search by one “step” (link, edge, whatever you want to call it in your application) on every iteration, which happens to have the effect of finding the smallest number of steps it takes to get to any given node f...
Implement C# Generic Timeout
...CallWithTimeout. This will cancel the long running thread by aborting it, and swallowing the ThreadAbortException:
Usage:
class Program
{
static void Main(string[] args)
{
//try the five second method with a 6 second timeout
CallWithTimeout(FiveSecondMethod, 6000);
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How to substring in jquery
How can I use jquery on the client side to substring "nameGorge" and remove "name" so it outputs just "Gorge"?
8 Answers
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