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How to create a colored 1x1 UIImage on the iPhone dynamically?
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You can use CGContextSetFillColorWithColor and CGContextFillRect for this:
Swift
extension UIImage {
class func image(with color: UIColor) -> UIImage {
let rect = CGRectMake(0.0, 0.0, 1.0, 1.0)
UIGraphicsBeginImageContext(rect.size)
le...
When should I use @classmethod and when def method(self)?
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Your guess is correct - you understand how classmethods work.
The why is that these methods can be called both on an instance OR on the class (in both cases, the class object will be passed as the first argument):
class Dummy(object):
@classmethod
d...
How to add to an existing hash in Ruby
...ash in Ruby, I'm in the process of working through Apress' Beginning Ruby and have just finished the hashes chapter.
7 Ans...
How to put individual tags for a scatter plot
I am trying to do a scatter plot in matplotlib and I couldn't find a way to add tags to the points. For example:
1 Answer
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Fixing the order of facets in ggplot
...that keeps things within a dplyr pipe chain. You sort the data in advance, and then using mutate_at to convert to a factor. I've modified the data slightly to show how this solution can be applied generally, given data that can be sensibly sorted:
# the data
temp <- data.frame(type=rep(c("T", "...
How to display full (non-truncated) dataframe information in html when converting from pandas datafr
I converted a pandas dataframe to an html output using the DataFrame.to_html function. When I save this to a separate html file, the file shows truncated output.
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Following git-flow how should you handle a hotfix of an earlier release?
If you try to follow the git-flow branching model, documented here and with tools here , how should you handle this situation:
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Natural Sort Order in C#
...The easiest thing to do is just P/Invoke the built-in function in Windows, and use it as the comparison function in your IComparer:
[DllImport("shlwapi.dll", CharSet = CharSet.Unicode)]
private static extern int StrCmpLogicalW(string psz1, string psz2);
Michael Kaplan has some examples of how thi...
Replace one character with another in Bash
...lexity is worse than linear. A small test: x="$(tr -dc 'a-z \n' </dev/urandom | head -c1M)"; time y="$(tr ' ' \\- <<< "$x")"; time z="${x// /-}". With a string length of 1M (=2^20) tr took 0.04s and bash 5.0.11 took 17s. With 2M tr took 0.07s (expected) but bash took 69s (4 times as lon...
Understanding exactly when a data.table is a reference to (vs a copy of) another data.table
I'm having a little trouble understanding the pass-by-reference properties of data.table . Some operations seem to 'break' the reference, and I'd like to understand exactly what's happening.
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