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How does BLAS get such extreme performance?
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149
A good starting point is the great book The Science of Programming Matrix Computations by Rober...
Multiple Updates in MySQL
...example:
INSERT INTO table (id,Col1,Col2) VALUES (1,1,1),(2,2,3),(3,9,3),(4,10,12)
ON DUPLICATE KEY UPDATE Col1=VALUES(Col1),Col2=VALUES(Col2);
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Remove the legend on a matplotlib figure
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243
As of matplotlib v1.4.0rc4, a remove method has been added to the legend object.
Usage:
ax.ge...
pyplot axes labels for subplots
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ax1.loglog(x, y1)
ax2.loglog(x, y2)
# Set common labels
fig.text(0.5, 0.04, 'common xlabel', ha='center', va='center')
fig.text(0.06, 0.5, 'common ylabel', ha='center', va='center', rotation='vertical')
ax1.set_title('ax1 title')
ax2.set_title('ax2 title')
plt.savefig('common_labels_text.png', d...
Two-way encryption: I need to store passwords that can be retrieved
... $salt = substr($data, 0, 128);
$enc = substr($data, 128, -64);
$mac = substr($data, -64);
list ($cipherKey, $macKey, $iv) = $this->getKeys($salt, $key);
if (!hash_equals(hash_hmac('sha512', $enc, $macKey, true), $mac)) {
return false;
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Do htmlspecialchars and mysql_real_escape_string keep my PHP code safe from injection?
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241
When it comes to database queries, always try and use prepared parameterised queries. The mysql...
How to have git log show filenames like svn log -v
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edited May 4 '17 at 8:18
zb226
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an...
PostgreSQL error 'Could not connect to server: No such file or directory'
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104
Check there is no postmaster.pid in your postgres directory, probably /usr/local/var/postgres/
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JSTL in JSF2 Facelets… makes sense?
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Kukeltje
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answered Jul 27 '10 at 12:40
BalusCBalusC
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XMLHttpRequest Origin null is not allowed Access-Control-Allow-Origin for file:/// to file:/// (Serv
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edited May 23 '17 at 11:54
Community♦
111 silver badge
answered Jan 20 '11 at 20:52
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