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How to tell if JRE or JDK is installed
...stalled JDK on. I have another computer with JRE, for, among other things, testing. However, when I got a java application working on this computer, and then tried it on another, it complained that JDK was required. How can I check if JDK was somehow installed on my system? Note: the computer in que...
Constructors in JavaScript objects
...ctions
//------------------------------------------------------------
Fail.Test = function Fail_Test(){
A.Func.That.Does.Not.Exist();
}
Fail.Test();
</script>
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Nearest neighbors in high-dimensional data?
...use n=3. In any event, it's simple to run your kNN algorithm over a set of test instances (to calculate predicted values) for n=1, n=2, n=3, etc. and plot the error as a function of n. If you just want a plausible value for n to get started, again, just use n = 3.
The second component is how to wei...
What is the performance cost of having a virtual method in a C++ class?
...ory. This is always a significant stall: on Xenon, about 650 cycles (by my tests).
However this isn't a problem specific to virtual functions because even a direct function call will cause a miss if you jump to instructions that aren't in cache. What matters is whether the function has been run be...
What does PHP keyword 'var' do?
...
I did tests. No returned E_STRICT ! sandbox.onlinephpfunctions.com/code/…
– Wallace Maxters
Jul 13 '15 at 12:07
...
Does Go provide REPL?
...d here, but the same speed makes REPL less necessary. Every time I want to test something in Go that I can't run in Playground I open a simple .go file and start coding and simply run the code. This will be even easier when the go command in Go 1 makes one-command build process possible and way easi...
Provide an image for WhatsApp link sharing
...r even store the website preview to their database. This means when you're testing your link in WhatsApp or Facebook for example, you'll most likely not see any difference right away. Using another link (another page) will do the trick. But as soon as you use that link once, this "please note" secti...
How to force 'cp' to overwrite directory instead of creating another one inside?
...al file
So as per your example, following is the file structure.
$ tree test
test
|-- bar
| |-- a
| `-- b
`-- foo
|-- a
`-- b
2 directories, 4 files
You can see the clear difference when you use -v for Verbose.
When you use just -R option.
$ cp -Rv foo/ bar/
`foo/' -> `bar/foo'
...
What is the right way to check for a null string in Objective-C?
...t check for pointer equality. See Topics for Cocoa: Using Null.
So a good test might be:
if (title == (id)[NSNull null] || title.length == 0 ) title = @"Something";
Note how you can use the fact that even if title is nil, title.length will return 0/nil/false, ie 0 in this case, so you do not hav...
How do I get the parent directory in Python?
...ts at the end of your URL and it will work E.g os.path.abspath(r'E:\O3M_Tests_Embedded\branches\sw_test_level_gp\test_scripts\..\..') Result: E:\\O3M_Tests_Embedded\\branches
– Arindam Roychowdhury
Dec 2 '15 at 11:31
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