Python Regular Expression

regular expression

  • use the match string
    • but not all the string can be matched
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python
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Mpi_parallel_programming_2

data type

  • there are only these data type in the MPI

    • if you want to use struct or multi array, you need to do something else
  • MPI data type c data type
    MPI_CHAR signed char|
    MPI_SHORT signed short int|
    MPI_INT signed int|
    MPI_LONG signed long int|
    MPI_UNSIGNED_CHAR unsigned long int|
    MPI_UNSIGNED_SHORT unsigned short int|
    MPI_UNSIGNED unsigned int|
    MPI_FLOAT float|
    MPI_DOUBLE double|
    MPI_LONG_DOUBLE long double|
    MPI_BYTE |
    MPI_MPI_PACKED |
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cplusplus, mpi
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Mpi_parallel_programming_1

difference between SIMD and MIMD

  • difference kinds of computer architecture is using the Flynn to classify
    • SISD
    • SIMD
    • MISD
    • MIMD
  • we only talk about the SIMD and MIMD here
    • SIMD means that one command deal with many data streams
      • most of the single core machine is SIMD machine
      • and these kinds of machine is most used in the image processing and multimedia processing.
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cplusplus, mpi
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Solution to Access Denied for User ‘Root’@’localhost’ (Using password:YES)

Access denied for user ‘root’@‘localhost’ (using password:YES)

  • in mac
    • open the my.conf in the directory /usr/local/mysql
    • add skip-grant-tables
    • restart the mysql service
      • sudo /usr/local/mysql/bin/mysqld_safe &
    • then use mysql -uroot -p
      • you can login without password
      • then update the password after use mysql;
      • update user set password=PASSWORD("rootadmin") where user='root';
    • after that
      • delete the skip-grant-tables add in the my.conf file
    • restart the mysql service
    • then you can use the mysql -u root -q to login with your new password
php
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Php Tutorial(1)

class 1

  • how the web site work when you request for the page
    • when you log into the internet, you request for the web server for a file that is the page.
    • if the web server is request for a html file, the server just give it back
    • else if it is the php file, the server send the php file to the php interpreter and process the php
      • and after the process, the interpreter give it back
      • (for php is an interpret kind of language and it do not need to be compile)
      • and then the server send the php file back to the web browser
    • if the php is interacting with the database, then the code of the php will have sql query with the database.
      • after the query, send back to the php interpreter and then send back to the server and then send back to the web browser
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php
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FMDB and Tableview in IOS

What is FMDB?

  • FMDB is a framework that used to simplified the sqlite3 operation
  • and we can use this framework to operate the sqlite easily
  • and we need to download the fmdb package in github
    • then copy the fmdb folder to our project
    • include the sqlite3 framework in your project
  • then you only need to write import"FMDB.h"
    • you will be able to use the api of fmdb
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