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Breaking loop when “warnings()” appear in R
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Afterwards, use options(warn=1) to restore the default setting.
– Alex Holcombe
May 15 '15 at 1:32
25
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How to empty a redis database?
...ws days and I'd like to know if there is a way to empty the db (remove the sets, the existing key....) easily.
During my tests, I created several sets with a lot of members, even created sets that I do not remember the name (how can I list those guys though ?).
Any idea about how to get rid of a...
MongoDB与内存 - 大数据 & AI - 清泛网移动版 - 专注C/C++及内核技术
...先看一个MongoDB服务器的top命令结果：
shell> top -p $(pidof mongod)
Mem: 32872124k total, 30065320k used, 2806804k free, 245020k buffers
Swap: 2097144k total, 100k used, 2097044k free, 26482048k cached
VIRT RES SHR %MEM
1892g 21g 21g 69.6
这台MongoDB服务器...
iOS: Compare two dates
...eFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"dd/MM/yyyy"];
[dateFormatter setLocale:[[[NSLocale alloc] initWithLocaleIdentifier:@"en_US"]
autorelease]];
NSString *stringDate = [dateFormatter stringFromDate:[NSDate date]];
curr...
How do I “git blame” a deleted line?
...s - three dots means "r1 r2 --not $(git merge-base --all r1 r2). It is the set of commits that are reachable from either one of r1 (left side) or r2 (right side), but not from both." - source: "man gitrevisions"
share
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Format bytes to kilobytes, megabytes, gigabytes
Scenario: the size of various files are stored in a database as bytes. What's the best way to format this size info to kilobytes, megabytes and gigabytes? For instance I have an MP3 that Ubuntu displays as "5.2 MB (5445632 bytes)". How would I display this on a web page as "5.2 MB" AND have files le...
What's the need of array with zero elements?
...ld not make the structure larger than the object being accessed; the
offset of the array shall remain that of the flexible array member, even if this would differ
from that of the replacement array. If this array would have no elements, it behaves as if
it had one element but the behavior ...
MediaHelper 媒体助手扩展：从媒体文件提取元数据和专辑封面 · App Inventor 2 中文网
...u.mit.appinventor.aicompanion3/test.mp3
绝对路径
file:///
file:///Android/data/edu.mit.appinventor.aicompanion3/test.mp3
参考
属性 Properties
专辑 Album
获取或设置媒体文件的专辑名称。
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How would you access Object properties from within an object method? [closed]
...s an object's properties from within an object method that is not a getter/setter method?
18 Answers
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How do I convert a numpy array to (and display) an image?
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You could use PIL to create (and display) an image:
from PIL import Image
import numpy as np
w, h = 512, 512
data = np.zeros((h, w, 3), dtype=np.uint8)
data[0:256, 0:256] = [255, 0, 0] # red patch in upper left
img = Image.fromarray(data, 'RGB')
img.save('my.png')
img.show()
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