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How to unload a package without restarting R
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Try this (see ?detach for more details):
detach("package:vegan", unload=TRUE)
It is possible to have multiple versions of a package loaded at once (for example, if you have a development version and a stable version in different libraries). To guarant...
How to test if parameters exist in rails
... but false.
There but an empty string.
as well. Hard to say without more details of your precise situation.
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How to get the first word of a sentence in PHP?
...value = "Test me more";
echo strtok($value, " "); // Test
?>
For more details and examples, see the strtok PHP manual page.
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how to return index of a sorted list? [duplicate]
...ttp://docs.python.org/library/collections.html#collections.OrderedDict for details.
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Java recursive Fibonacci sequence
...lt of previous calculated numbers. eg F(n-3) is called 3 times.
For more details refer algorithm by dasgupta chapter 0.2
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C++ catch blocks - catch exception by value or reference? [duplicate]
...n be useful here. For catch by value, base class object lose derived class details, for catch by reference, derived class information is merely hidden.
– Rick
Sep 19 '18 at 3:16
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Android Fragments. Retaining an AsyncTask during screen rotation or configuration change
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I think you will enjoy my extremely comprehensive and working example detailed below.
Rotation works, and the dialog survives.
You can cancel the task and dialog by pressing the back button (if you want this behaviour).
It uses fragments.
The layout of the fragment underneath the activity cha...
What are the advantages of using nullptr?
...ockAndCall(f3, f3m, nullptr);
//do something
return 0;
}
Detail analysis why compilation failed for lockAndCall(f1, f1m, 0) & lockAndCall(f3, f3m, nullptr) not for lockAndCall(f3, f3m, nullptr)
Why compilation of lockAndCall(f1, f1m, 0) & lockAndCall(f3, f3m, nullptr) fail...
Cannot set boolean values in LocalStorage?
... non-strings. See https://www.w3.org/Bugs/Public/show_bug.cgi?id=12111 for detail.
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How to concatenate multiple lines of output to one line?
... line and the number of all characters combined, but we can increase them. Details can be found by running this command: xargs --show-limits and of course in the manual: man xargs
When we want to replace one character with another exactly one character:
tr '\n' ' ' < file
When we want to repl...