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Author: Simo

Regular expression matching, very simple:

I want to match Twitter grammar with regular expressions.

How do I match any “@______”, that is, start with the @ symbol and nothing after it Spaces, only letters and numbers, until the end o

October 17, 2021By Simo Regexp expression, match, regular, simpleLeave a Comment

[Research “] Operating System D3: Storage Management

1. Basic concepts of storage management

2. Single continuous partition storage Management

3. Page-based storage management**

5. Others

PS: Many years ago, when people were s

October 17, 2021By Simo Os Theory chapter, D3, management, Operating System, Repeated computer, storageLeave a Comment

The procedure of the program: It is convenient to view and maintain.

The main purpose of writing the program is to read it easily in the future and to facilitate viewing and maintenance.

//Return error convention: If the command is related to the site, it will

October 17, 2021By Simo Os Theory Convenient, later, Maintenance, program, view, writeLeave a Comment

Write an operating system 2 – Install BOCHS Virtual Machine

Take the ubuntu operating system as an example

I. Command line installation

sudo apt-get install vgabios bochs bochs-x bximage

This The method is convenient, but it is said that t

October 17, 2021By Simo Os Theory Bochs, installation, Operating System, Virtual Machine, week, writeLeave a Comment

Recurrent harmonic function returns NAN

I wrote the following sample code to find the harmonic value of N (1 1/2 1/3… 1 / N). Read the comments in the code written with BOLD, and Help me find why this happens.

#include
float harmo

October 17, 2021By Simo Mathematics functions, harmonics, nan, Recursive, returnLeave a Comment

What is the difference between operating systems – operating systems and meta-operating systems?

I recently heard the term meta operating system while studying ros. Can you help me distinguish between an operating system and a meta operating system? This paper best explains what ROS is and

October 17, 2021By Simo Os Theory between, Difference, Operating System, what, YuanLeave a Comment

Multi-core – How does the operating system use all cores for my application?

I have a COM written in Berlin Delphi 101. I wrote a script to call its API (only one API, single thread, each takes about 1 minute to complete).

I use cscript.exe (64-bit) to run the vbs fil

October 17, 2021By Simo Os Theory all, application, Core, for, How, Multi, my, Operating System, programLeave a Comment

RPG puzzle, 3 colors for N-grid

There are n squares arranged in a row. Paint each square with three colors of red (Red), pink (Pink) and green (Green). Each square is painted with one color. Any adjacent squares are required. Can

October 17, 2021By Simo Mathematics coated, color, grid, puzzle, RPG, square, three typesLeave a Comment

Use variables with regular expressions to find data in MongoDB (Meteor APP)

I need to get data from Mongodb, depending on what I’m searching for. It works fine in the next two examples:
//Example 1;

var variable = “car”; Items.find({“description”: variable}).fetch()

October 17, 2021By Simo Regexp app, data, expression, Find, Meteor, MongoDB, regular, Using, variableLeave a Comment

How to make a gradient fill time sequence diagram in R

How to fill the area below the (sp) line with a gradient color?

This example was drawn in Inkscape-but I need a vertical gradient-not horizontal.

Interval from zero to positive == from

October 17, 2021By Simo Mathematics color, filling, How, illustration, Making, Time SeriesLeave a Comment

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