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How to capture UIView to UIImage without loss of quality on retina display
... UIGraphicsBeginImageContextWithOptions (as documented on this page). Pass 0.0 for scale (the third argument) and you'll get a context with a scale factor equal to that of the screen.
UIGraphicsBeginImageContext uses a fixed scale factor of 1.0, so you're actually getting exactly the same image on ...
What are some compelling use cases for dependent method types?
...tside ResourceManager
def testHash(r : Resource) = assert(r.hash == "9e47088d")
def testDuplicates(r : Resource) = assert(r.duplicates(r))
}
trait FileManager extends ResourceManager {
type Resource <: File
trait File extends BasicResource {
def local : Boolean
}
override def c...
How to execute a java .class from the command line
... |
edited May 23 '17 at 10:31
Community♦
111 silver badge
answered Aug 14 '09 at 18:53
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Matplotlib scatterplot; colour as a function of a third variable
...
import matplotlib.pyplot as plt
# Generate data...
x = np.random.random(10)
y = np.random.random(10)
# Plot...
plt.scatter(x, y, c=y, s=500)
plt.gray()
plt.show()
Or, if you'd prefer a wider range of colormaps, you can also specify the cmap kwarg to scatter. To use the reversed version of a...
Python Pandas: Get index of rows which column matches certain value
...[i] returns the ith row of df. i does not refer to the index label, i is a 0-based index.
In contrast, the attribute index returns actual index labels, not numeric row-indices:
df.index[df['BoolCol'] == True].tolist()
or equivalently,
df.index[df['BoolCol']].tolist()
You can see the differenc...
memory_get_peak_usage() with “real usage”
...
+400
Ok, lets test this using a simple script:
ini_set('memory_limit', '1M');
$x = '';
while(true) {
echo "not real: ".(memory_get_peak...
How to replace a character with a newline in Emacs?
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answered Mar 4 '09 at 23:52
Jonathan ArkellJonathan Arkell
9,45522 gold badges2222 silver badges3232 bronze badges
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Include all files in a folder in a single bundle
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edited Feb 11 '15 at 0:38
daniellmb
31.2k44 gold badges4747 silver badges6060 bronze badges
answere...
How to add new item to hash
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307
Create the hash:
hash = {:item1 => 1}
Add a new item to it:
hash[:item2] = 2
...
How do I put an already-running process under nohup?
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edited May 21 '14 at 0:19
the Tin Man
147k3131 gold badges192192 silver badges272272 bronze badges
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