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How to check if a map contains a key in Go?
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64
Searched on the go-nuts email list and found a solution posted by Peter Froehlich on 11/15/2009...
Convert .pem to .crt and .key
... format. The PEM form is the default format: it consists of the DER format base64 encoded with additional header and footer lines. On input PKCS#8 format private keys are also accepted. The NET form is a format is described in the NOTES section.
-outform DER|NET|PEM
This specifies the output ...
SQL query return data from multiple tables
...CategoryName = 'Comedy' AND
b.CategoryName = 'Romance'
SQLFiddle Demo
which is definitely very wrong because it produces no result. The explanation of this is that there is only one valid value of CategoryName on each row. For instance, the first condition returns true, the second conditi...
Image fingerprint to compare similarity of many images
...://redaktor.me/phasher/demo_js/index.html
Unfortunately this is "bitcount"-based but will recognize rotated images.
Another approach in javascript was to build a luminosity histogram from the image by the help of canvas. You can visualize a polygon histogram on the canvas and compare that polygon in...
Does Flask support regular expressions in its URL routing?
... this could be done.
from flask import Flask
from werkzeug.routing import BaseConverter
app = Flask(__name__)
class RegexConverter(BaseConverter):
def __init__(self, url_map, *items):
super(RegexConverter, self).__init__(url_map)
self.regex = items[0]
app.url_map.converters[...
Trimming a huge (3.5 GB) csv file to read into R
...eel like firing up a big memory instance on Amazon's EC2 you can get up to 64GB of RAM. That should hold your file plus plenty of room to manipulate the data.
If you need more speed, then Shane's recommendation to use Map Reduce is a very good one. However if you go the route of using a big memory ...
How does C compute sin() and other math functions?
..., this is the code that actually runs when you call sin() on a typical x86-64 Linux system. It is apparently faster than the fsin assembly instruction. Source code: sysdeps/ieee754/dbl-64/s_sin.c, look for __sin (double x).
This code is very complex. No one software algorithm is as fast as possible...
Clearing purchases from iOS in-app purchase sandbox for a test user
...box testing. Depends on the app obviously, but I'm testing a subscription based app that only purchases during sign up at the moment so it's been the easiest solution.
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MySQL: What's the difference between float and double?
Checking in the new database structure I saw that someone changed a field from float to double. Wondering why, I checked the mysql documentation, but honestly didn't understand what the difference is.
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anchor jumping by using javascript
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Not enough rep for a comment.
The getElementById() based method in the selected answer won't work if the anchor has name but not id set (which is not recommended, but does happen in the wild).
Something to bare in mind if you don't have control of the document markup (e.g. we...