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Quickly reading very large tables as dataframes
...t nrows=the number of records in your data (nmax in scan).
Make sure that comment.char="" to turn off interpretation of comments.
Explicitly define the classes of each column using colClasses in read.table.
Setting multi.line=FALSE may also improve performance in scan.
If none of these thing wo...
How do I create a nice-looking DMG for Mac OS X using command-line tools?
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After lots of research, I've come up with this answer, and I'm hereby putting it here as an answer for my own question, for reference:
Make sure that "Enable access for assistive devices" is checked in System Preferences>>Universal Access. It is ...
How to remove the border highlight on an input text element
...lect:focus,
textarea:focus,
button:focus {
outline: none;
}
In the comments, Noah Whitmore suggested taking this even further to support elements that have the contenteditable attribute set to true (effectively making them a type of input element). The following should target those as well (...
How to change the session timeout in PHP?
...had just started.
Certainty in critical environments
You can make things completely controllable by using custom logic to also place an upper bound on session inactivity; together with the lower bound from above this results in a strict setting.
Do this by saving the upper bound together with the ...
List or IList [closed]
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Ah. OK. I get that. Picking the lowest common denominator for a contract. Thanks!
– StingyJack
Dec 30 '08 at 13:34
16
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How to remove convexity defects in a Sudoku square?
...ku from an input image using OpenCV (as in Google goggles etc). And I have completed the task, but at the end I found a little problem for which I came here.
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Generate a random point within a circle (uniformly)
...a distance x+y from the origin. If x+y>R we fold back down.
Here's the complete algorithm for R=1. I hope you agree it's pretty simple. It uses trig, but you can give a guarantee on how long it'll take, and how many random() calls it needs, unlike rejection sampling.
t = 2*pi*random()
u = rando...
Can we define implicit conversions of enums in c#?
... declaring a normal enum (though you can refactor some of the above into a common generic base class). You can go even further by having the base class implement IComparable & IEquatable, as well as adding methods to return the value of DescriptionAttributes, declared names, etc, etc.
I wrote a...
How to use HTML to print header and footer on every printed page of a document?
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Simple Digit Recognition OCR in OpenCV-Python
...rposes).
1) My first question was about letter_recognition.data file that comes with OpenCV samples. I wanted to know what is inside that file.
It contains a letter, along with 16 features of that letter.
And this SOF helped me to find it. These 16 features are explained in the paperLetter Recogn...