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How do I use extern to share variables between source files?
I know that global variables in C sometimes have the extern keyword. What is an extern variable? What is the declaration like? What is its scope?
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Current time in microseconds in java
...ave System.nanoTime(), but that just gives an offset from some previously known time. So whilst you can't take the absolute number from this, you can use it to measure nanosecond (or higher) precision.
Note that the JavaDoc says that whilst this provides nanosecond precision, that doesn't mean nano...
Will using 'var' affect performance?
...ate 8 Years Later
I need to update this as my understanding has changed. I now believe it may be possible for var to affect performance in the situation where a method returns an interface, but you would have used an exact type. For example, if you have this method:
IList<int> Foo()
{
retu...
rgdal package installation
...h are dependencies! Unfortunately, rgdal still won't find pro_api.h right now since it isn't looking in /usr/local/include. To fix this and other possible maladies with your rgdal installation, use the following R command to install rgdal:
> install.packages('rgdal', type = "source", configu...
How can I color Python logging output?
...essage only developers care about")
log.info("Curious users might want to know this")
log.warn("Something is wrong and any user should be informed")
log.error("Serious stuff, this is red for a reason")
log.critical("OH NO everything is on fire")
Output:
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How to implement a ConfigurationSection with a ConfigurationElementCollection
...se "add" the default one but i changed it just for the sake of this post.
Now all of our nested Elements have been implemented now we should aggregate all of those in a class which has to implement System.Configuration.ConfigurationSection
CustomApplicationConfigSection
public class CustomApplica...
how to draw smooth curve through N points using javascript HTML5 canvas?
...ation.) In other words the two disjointed curves have much more in common now.
This solution was extracted out of the book "Foundation ActionScript 3.0 Animation: Making things move". p.95 - rendering techniques: creating multiple curves.
Note: this solution does not actually draw through each o...
Get bitcoin historical data [closed]
... acquired live through bitstamp's pusher API which is what I'm doing right now. After indexing bitstamp for a day, I downloaded the bitstampUSD.csv and prepended the data to have a complete picture
– nurettin
Mar 5 '14 at 17:40
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Why do you need explicitly have the “self” argument in a Python method?
...k bork bork!
>>> c.foo()
Hi!
>>>
It also (as far as I know) makes the implementation of the python runtime easier.
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Facebook Android Generate Key Hash
...ate a new certificate when you next try to build a debug package.
Let me know if that works.
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