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Java - get pixel array from image
...aster than the first approach.
In my application I was able to reduce the time of processing the pixels by more than 90% by just switching from the first approach to the second!
Here is a comparison I've setup to compare the two approaches:
import java.awt.image.BufferedImage;
import java.awt.ima...
Structure padding and packing
... It will look at the memory as a big row of 8 bytes building blocks. Every time it needs to get some information from the memory, it will reach one of those blocks and get it.
As seem in the image above, doesn't matter where a Char (1 byte long) is, since it will be inside one of those blocks, re...
Determine function name from within that function (without using traceback)
...ame().f_code.co_name)
Note that the inspect.stack calls are thousands of times slower than the alternatives:
$ python -m timeit -s 'import inspect, sys' 'inspect.stack()[0][0].f_code.co_name'
1000 loops, best of 3: 499 usec per loop
$ python -m timeit -s 'import inspect, sys' 'inspect.stack()[0][...
How to parse JSON in Scala using standard Scala classes?
...ultFormats
lazy val json: json4s.JValue = parse(log)
lazy val create_time: String = (json \ "create_time").extractOrElse("1970-01-01 00:00:00")
lazy val site_id: String = (json \ "site_id").extractOrElse("")
lazy val alipay_total_price: Double = (json \ "alipay_total_price").extractOpt[Str...
Easy interview question got harder: given numbers 1..100, find the missing number(s) given exactly k
...
+1 This is really, really clever. At the same time, it's questionable, whether it's really worth the effort, or whether (parts of) this solution to a quite artificial problem can be reused in another way. And even if this were a real world problem, on many platforms the ...
How do I delete an Azure storage account containing a leased blob?
... @PaulKeister It's buggy on Firefox 17.0.1 as well. I had to try a few times.
– Justin Skiles
Dec 18 '12 at 23:02
...
Listing only directories using ls in Bash?
...ppening because there are no subdirectories to list. You get that error anytime you use ls on something that doesn't exist.
– Gordon Davisson
Jul 1 '15 at 0:21
1
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Transitions on the CSS display property
...ncatenate two transitions or more, and visibility is what comes handy this time.
div {
border: 1px solid #eee;
}
div > ul {
visibility: hidden;
opacity: 0;
transition: visibility 0s, opacity 0.5s linear;
}
div:hover > ul {
visibility: visible;
opacity: 1;
}
<div...
The new keyword “auto”; When should it be used to declare a variable type? [duplicate]
... looking at the code.
1. Avoid using new and raw-pointers though.
Sometime, the type is so irrelevant that the knowledge of the type is not even needed, such as in expression template; in fact, practically it is impossible to write the type (correctly), in such cases auto is a relief for progra...
How to get UTC time in Python?
...uite what I need. In JavaScript, I'm using the following to calculate UTC time since Jan 1st 1970:
6 Answers
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