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Sort objects in ArrayList by date?
...MyObject o) {
return getDateTime().compareTo(o.getDateTime());
}
}
And then you sort it by calling:
Collections.sort(myList);
However sometimes you don't want to change your model, like when you want to sort on several different properties. In that case, you can create comparator on the f...
How to convert a factor to integer\numeric without loss of information?
...actor:
In particular, as.numeric applied to
a factor is meaningless, and may
happen by implicit coercion. To
transform a factor f to
approximately its original numeric
values, as.numeric(levels(f))[f] is
recommended and slightly more
efficient than
as.numeric(as.character(f)).
...
Virtual Serial Port for Linux
...erial port is a "real teletype") for this. From one end, open /dev/ptyp5, and then attach your program to /dev/ttyp5; ttyp5 will act just like a serial port, but will send/receive everything it does via /dev/ptyp5.
If you really need it to talk to a file called /dev/ttys2, then simply move your ol...
data.frame rows to a list
...
Like this:
xy.list <- split(xy.df, seq(nrow(xy.df)))
And if you want the rownames of xy.df to be the names of the output list, you can do:
xy.list <- setNames(split(xy.df, seq(nrow(xy.df))), rownames(xy.df))
...
How to print a dictionary's key?
...You have the keys() method, which gives you a python list of all the keys, and you have the iteritems() method, which returns key-value pairs, so
for key, value in mydic.iteritems() :
print key, value
Python 3 version:
for key, value in mydic.items() :
print (key, value)
So you have a ...
to drawRect or not to drawRect (when should one use drawRect/Core Graphics vs subviews/images and wh
...f this question: I know HOW to create complicated views with both subviews and using drawRect. I'm trying to fully understand the when's and why's to use one over the other.
...
Get epoch for a specific date using Javascript
...
You can create a Date object, and call getTime on it:
new Date(2010, 6, 26).getTime() / 1000
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What is __future__ in Python used for and how/when to use it, and how it works
__future__ frequently appears in Python modules. I do not understand what __future__ is for and how/when to use it even after reading the Python's __future__ doc .
...
Fast and responsive interactive charts/graphs: SVG, Canvas, other?
...right technology to use for updating a project that basically renders thousands of points in a zoomable, pannable graph. The current implementation, using Protovis, is underperformant. Check it out here:
...
Best Practice: Access form elements by HTML id or name attribute?
...
Give your form an id only, and your input a name only:
<form id="myform">
<input type="text" name="foo">
Then the most standards-compliant and least problematic way to access your input element is via:
document.getElementById("myform"...