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Tag: Medium

How to match the comparative operator in the regular expression

I am trying to create a regular expression that matches comparisons like this:

= 445
> 5
>= 22
< 3 <= 42 <> 10 I think this will work, but it won’t:

[=|>|<|>=|<|<=|<>]\s\d+ ‘>’very imp

October 17, 2021By Simo Regexp comparison, expressions, How to match, Medium, operators, regularLeave a Comment

Use Group_by to find the percentage in the subgroup and summarize

I am new to dplyr and tried to make the following conversion without luck. I have searched on the internet and I found an example of doing the same in ddply, but I want to use dplyr .

I have

October 17, 2021By Simo Mathematics Find, Group, incorporated, line, Medium, percentage, Sub, Summary, useLeave a Comment

Operating system core principle -3. Process principle (medium): process schedule

PS: In a multi-process concurrent environment, although conceptually, there are multiple processes executing at the same time, but under a single CPU, at any time Only one process can be in the exe

October 17, 2021By Simo Os Theory Core, Medium, Operating System, principle, process, SchedulingLeave a Comment

Arrays – Decrease performance when you store handle objects in unit arrays

I only have a small part of MATLAB code that has a lot of performance issues, I hope you can learn how to improve it:

I am developing an agent-based Simulation, it creates many handle objects

October 17, 2021By Simo Os Theory array, Arrays, handle, Low, Medium, object, performance, storage, time, UnitLeave a Comment

Regular expression – Multi-line match in Haskell POSIX

I can’t seem to find suitable documentation on Haskell’s POSIX implementation.
Especially the module Text. Regex.Posix.

Anyone Can you point me in the right direction to use multi-line match

October 17, 2021By Simo Regexp expressions, Haskell, matching, Medium, Multi-line, POSIX, regularLeave a Comment

Exit the application in the operating system without separating memory

I am writing a monolithic operating system (it is a joke to call it an operating system, but it does have very small, school-level functionalists).
When I When talking about monolithic, I mean, it

October 17, 2021By Simo Os Theory application, Exit, Medium, memory, no separation, Operating System, programLeave a Comment

Use a sub-string twice in regular expressions

First of all, this question may have been asked before, but I am not sure what phrase to search for.

I have a string:

Maaaa

I have a pattern:

aaa< /p> I want to match twice

October 17, 2021By Simo Regexp expression, Medium, regular, substring, twice, useLeave a Comment

Can API hooks in the API do not do it?

In the world of penetration testing with Python, it looks like
one must usually hook into operating system-specific APIs. This makes sense
right In my case, because we are dealing with different ar

October 17, 2021By Simo Os Theory API, can, Hook, independent, Medium, Operating SystemLeave a Comment

Two-fork tree order, order, follow-up traversal non-recursion

1 **
2 * Binary tree first-order traversal non-recursive
3 * @param root
4 */
5 public void preOrder_no_recursive(TreeNode root){
6 if(root == null) return;
7
8 Stack stack = new Sta

October 17, 2021By Simo Mathematics First, Medium, non-recursive, order, subsequent, traversal, Two-forkedLeave a Comment

What is the difference between the page and blocks in the operating system – operating system?

I have learned that int operating system (Linux), MMU can convert VA (virtual address) to PA (physical address) through the page table data structure, it seems that the page is managed by the VM Th

October 17, 2021By Simo Os Theory between, block, Difference between operating system, Medium, Operating System, whatLeave a Comment

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