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How do I create an empty array/matrix in NumPy?
...p.array(x)
The result will be:
In [34]: x
Out[34]: array([], dtype=float64)
Therefore you can directly initialize an np array as follows:
In [36]: x= np.array([], dtype=np.float64)
I hope this helps.
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Is there any way to specify a suggested filename when using data: URI?
...ownload attribute:
<a download="logo.gif" href="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7">Download transparent png</a>
Javascript only: you can save any data URI with this code:
function saveAs(uri, filename) {
var link = docume...
Selecting with complex criteria from pandas.DataFrame
...(df["B"] > 50) & (df["C"] == 900)]
2 5
3 8
Name: A, dtype: int64
but you can get yourself into trouble because of the difference between a view and a copy doing this for write access. You can use .loc instead:
>>> df.loc[(df["B"] > 50) & (df["C"] == 900), "A"]
2 5...
ASP MVC in IIS 7 results in: HTTP Error 403.14 - Forbidden
...
Don't forget that for a 64 bit system it's "Framework64". I.e., Windows\Microsoft.NET\Framework64\v4.xxx.xxx
– grahamesd
Dec 17 '15 at 21:29
...
How can I open a cmd window in a specific location?
...
64
Try out this "PowerToy" from Microsoft:
Open Command Window Here
This PowerToy adds an...
docker mounting volumes on host
...d8a16b48d2...",
"/var/log/nginx": "/var/lib/docker/vfs/dir/71896ce364ef919592f4e99c6e22ce87..."
},
"VolumesRW": {
"/var/www": false,
"/var/cache/nginx": true,
"/var/log/nginx": true
}
}]
What I usually do is make symlinks in some standard place such as /...
Bash: infinite sleep (infinite blocking)
... was a cool thing to learn about for Linux. However, while true; do sleep 86400; done ought to be an adequate substitute.
– Ivan X
Feb 1 '15 at 10:26
...
Comparison of DES, Triple DES, AES, blowfish encryption for data
...-forced, as has been demonstrated more than ten years ago). Also, DES uses 64-bit blocks, which raises some potential issues when encrypting several gigabytes of data with the same key (a gigabyte is not that big nowadays).
3DES is a trick to reuse DES implementations, by cascading three instances o...
Algorithm to detect corners of paper sheet in photo
...[1])
# these constants are carefully picked
MORPH = 9
CANNY = 84
HOUGH = 25
img = cv2.cvtColor(orig, cv2.COLOR_BGR2GRAY)
cv2.GaussianBlur(img, (3,3), 0, img)
# this is to recognize white on white
kernel = cv2.getStructuringElement(cv2.MORPH_RECT,(MORPH,MORPH))
...
Media Queries: How to target desktop, tablet, and mobile?
...possible to press - especially on your screen!
– greg84
Jan 15 '14 at 0:01
6
@media only screen a...