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Finding all cycles in a directed graph
... 1 then there is an infinite number of those. For example A-B-A, A-B-A-B-A etc. Or it may be possible to join together 2 cycles into an 8-like cycle etc., etc... The meaningful approach is to look for all so called simple cycles - those that do not cross themselves except in the start/end point. The...
Understanding MongoDB BSON Document size limit
...s file metadata.
You can use this method to store images, files, videos, etc in the database much as you might in a SQL database. I have used this to even store multi gigabyte video files.
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Awk学习笔记 - 更多技术 - 清泛网 - 专注C/C++及内核技术
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12. 一个验证passwd文件有效性的例子
$ cat /etc/passwd | awk -F: '\ NF != 7{\ printf("line %d,does not have 7 fields:%s\n",NR,$0)}\ $1 !~ /[A-Za-z0-9]/{printf("line %d,non alpha and numeric user id:%d: %s\n,NR,$0)}\ $2 == "*" {printf("line %d, no password: %s\n",NR,$0)}'...
Android screen size HDPI, LDPI, MDPI [duplicate]
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320dp: a typical phone screen (240x320 ldpi, 320x480 mdpi, 480x800 hdpi, etc).
480dp: a tweener tablet like the Streak (480x800 mdpi).
600dp: a 7” tablet (600x1024 mdpi).
720dp: a 10” tablet (720x1280 mdpi, 800x1280 mdpi, etc).
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What is the difference between supervised learning and unsupervised learning? [closed]
...is (round skin-like-colored disk, with dark area where you expect the eyes etc). A machine learning algorithm would not have such coded definition, but would "learn-by-examples": you'll show several images of faces and not-faces and a good algorithm will eventually learn and be able to predict wheth...
Getting only Month and Year from SQL DATE
... want the result to be a date
- But you want to 'discard' the Days, Hours, etc
- Leaving a year/month only date field
SELECT
DATEADD(MONTH, DATEDIFF(MONTH, 0, <dateField>), 0) AS [year_month_date_field]
FROM
<your_table>
This gets the number of whole months from a base date (0...
Confusion about vim folding - how to disable?
...en
Once you enable codefolding, you will have all the commands like zf,zo etc at your wish according to the setting of :set fdm=xxxx where typical values are expr,syntax,manual etc.
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Optimal number of threads per core
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If your threads don't do I/O, synchronization, etc., and there's nothing else running, 1 thread per core will get you the best performance. However that very likely not the case. Adding more threads usually helps, but after some point, they cause some performance degradat...
vim line numbers - how to have them on by default?
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Terminal > su > password > vim /etc/vimrc
Click here and edit as in line number (13):
set nu
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What are the differences among grep, awk & sed? [duplicate]
...e second column of file.txt
Basic awk usage:
Compute sum/average/max/min/etc. what ever you may need.
$ cat file.txt
A 10
B 20
C 60
$ awk 'BEGIN {sum=0; count=0; OFS="\t"} {sum+=$2; count++} END {print "Average:", sum/count}' file.txt
Average: 30
I recommend that you read this book: Sed &...