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How to sort a dataframe by multiple column(s)
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You can use the order() function directly without resorting to add-on tools -- see this simpler answer which uses a trick right from the top of the example(order) code:
R> dd[with(dd, order(-z, b)), ]
b x y z
4 Low C 9 2
2 Med D 3 1
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Greedy vs. Reluctant vs. Possessive Quantifiers
... another character, etc. So a greedy quantifier checks possible matches in order from longest to shortest.
A reluctant quantifier tells the engine to start with the shortest possible piece of the string. If it matches, the engine can continue; if not, it adds one character to the section of the stri...
Can't connect Nexus 4 to adb: unauthorized
...ry to get my Nexus 7 to bring up the auth dialog. For future reference, in order to change the USB connection mode, you have to go into Settings, Storage and hit the menu icon button in the top right - talk about obscure! I had neither MTP or Camera checked, but as soon as I checked the Camera optio...
What is Activity.finish() method doing exactly?
..., and found that onPause(), onStop() and onDestroy() will all be called in order after you call finish().
– Sam003
Jul 13 '15 at 23:55
5
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How do I check if file exists in Makefile so I can delete it?
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In order for this to work you need to add || true at the end so the command return true when file don't exists.
– jcubic
Jan 21 '18 at 14:17
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Find object by id in an array of JavaScript objects
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As long as you don't rely on the order of properties: stackoverflow.com/questions/4886314/…
– Marle1
Nov 5 '14 at 16:28
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LISTAGG in Oracle to return distinct values
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19c and later:
select listagg(distinct the_column, ',') within group (order by the_column)
from the_table
18c and earlier:
select listagg(the_column, ',') within group (order by the_column)
from (
select distinct the_column
from the_table
) t
If you need more columns, something like...
How to Programmatically Add Views to Views
...something like R.layout.myView
please notice that you need a ViewGroup in order to add a view (which is any layout you can think of)
so as an example lets say you have a fragment which it view already been inflated and you know that the root view is a layout, and you want to add a view to it:
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random.seed(): What does it do?
...on the same input. This means, it depends on the value of the seed. So, in order to make it more random, time is automatically assigned to seed().
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Create table (structure) from existing table
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I thought 1=2 would be just a weird wrong argument in order to avoid copying data.
– Arthur Zennig
Sep 28 '16 at 10:21
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