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Algorithm to detect intersection of two rectangles?
...lace the second rectangle rotated 45 degrees to the first rectangle and offset along the diagonal so that it fulfills the above intersection tests but doesn't intersect.
– Skizz
Sep 22 '08 at 21:22
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Web colors in an Android color xml resource file
... Thanks, but I am aware of all that. It's just that the X11/W3c color set is such a standard, I was hoping someone might have one ready made!
– gssi
Sep 22 '10 at 21:48
1
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How to sum a variable by group
...ow to summarise data by group using dplyr functions using the built-in dataset mtcars:
# several summary columns with arbitrary names
mtcars %>%
group_by(cyl, gear) %>% # multiple group columns
summarise(max_hp = max(hp), mean_mpg = mean(mpg)) # multiple summa...
Rotating x axis labels in R for barplot
... do a little tweaking up and down. Here's an example with the mtcars data set:
x <- barplot(table(mtcars$cyl), xaxt="n")
labs <- paste(names(table(mtcars$cyl)), "cylinders")
text(cex=1, x=x-.25, y=-1.25, labs, xpd=TRUE, srt=45)
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HashSet vs. List performance
It's clear that a search performance of the generic HashSet<T> class is higher than of the generic List<T> class. Just compare the hash-based key with the linear approach in the List<T> class.
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Defining private module functions in python
According to http://www.faqs.org/docs/diveintopython/fileinfo_private.html :
9 Answers
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Reverting part of a commit with git
...n $bad_commit # Revert the commit, but don't commit the changes
$ git reset HEAD . # Unstage the changes
$ git add --patch . # Add whatever changes you want
$ git commit # Commit those changes
Note: The files you add using git add --patch are the files y...
How to get element by innerText
.... XPath can do much more, like select node by attribute value, select node sets ... Simple intro: w3schools.com/xml/xpath_syntax.asp
– Timathon
Dec 2 '17 at 2:43
2
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PHP best way to MD5 multi-dimensional array?
What is the best way to generate an MD5 (or any other hash) of a multi-dimensional array?
13 Answers
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Precise Financial Calculation in JavaScript. What Are the Gotchas?
...mal representation errors can be avoided by scaling1.
Note that while the set of real numbers is infinite, only a finite number of them (18,437,736,874,454,810,627 to be exact) can be represented exactly by the JavaScript floating-point format. Therefore the representation of the other numbers will...