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What does the “at” (@) symbol do in Python?
...lf, B):
A = self
return Mat([[sum(A[i][k]*B[k][j] for k in range(len(B)))
for j in range(len(B[0])) ] for i in range(len(A))])
A = Mat([[1,3],[7,5]])
B = Mat([[6,8],[4,2]])
print(A @ B)
This code yields:
[[18, 14], [62, 66]]
...
How do I escape ampersands in XML so they are rendered as entities in HTML?
... It might be a guess; it is correct though. CDATA markers allow raw ampersands to be used.
– Quentin
Aug 25 '09 at 14:40
19
...
What are the benefits of Java's types erasure?
..."type erasure". Since generic types are not erased but replaced with their raw counterparts, a better choice seems to be "type mutilation".
The quintessential feature of type erasure in its commonly understood sense is forcing the runtime to stay within the boundaries of the static type system by m...
Only detect click event on pseudo-element
...s X and Y also relative to the document.
Therefore, I can come up with a range of "clickable" region on the entire page that never changes.
Here's my demo on codepen.
or if too lazy for codepen, here's the JS:
* I only cared about the Y values for my example.
var box = $('.box');
// clicka...
How does the Windows Command Interpreter (CMD.EXE) parse scripts?
...ten in C/C++, or if the new process chooses to ignore argv and process the raw commandline for itself (e.g. with GetCommandLine()). At the OS level, Windows passes command lines untokenized as a single string to new processes. This is in contrast to most *nix shells, where the shell tokenizes argu...
How can I use Guzzle to send a POST request in JSON?
...
For Guzzle <= 4:
It's a raw post request so putting the JSON in the body solved the problem
$request = $this->client->post(
$url,
[
'content-type' => 'application/json'
],
);
$request->setBody($data); #set body!
$resp...
Changing image size in Markdown
...
You could just use some HTML in your Markdown:
<img src="drawing.jpg" alt="drawing" width="200"/>
Or via style attribute (not supported by GitHub)
<img src="drawing.jpg" alt="drawing" style="width:200px;"/>
Or you could use a custom CSS file as described in this answer...
Finding the number of days between two dates
...M,$EndD,$EndY) - gregoriantojd($StartM,$StartD,$StartY); (for an inclusive range). Unlike the Datetime Class, Gregorian to Julian is available in v4 up. Valid range is 4714 B.C. to 9999 A.D. Beware of the funky parameter order (like you need that warning for php).
– Guy Gord...
How to HTML encode/escape a string? Is there a built-in?
... 3 HTML will be escaped by default.
For non-escaped strings use:
<%= raw "<p>hello world!</p>" %>
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Selecting with complex criteria from pandas.DataFrame
...mport randint
>>> df = pd.DataFrame({'A': [randint(1, 9) for x in range(10)],
'B': [randint(1, 9)*10 for x in range(10)],
'C': [randint(1, 9)*100 for x in range(10)]})
>>> df
A B C
0 9 40 300
1 9 70 700
2 5 70 900
3 8 80 900...