set symbols

I was about to pick up an algorithm book to read ... "Computational Geometry", and found out that there is some gap that I am missing.......

I don't understand the symbols of the formula in the book.

After some search thru the Internet, got to know that those are actually called the "symbol set".

and here is a very good site that explains it

http://www.rapidtables.com/math/symbols/Set_Symbols.htm

https://www.glenoaks.edu/facultystaff/FacultyWebSites/JillToner/Documents/NSM105%20-%20Math%20for%20El%20Ed/Section%202.1%20-%20Set%20Theory.pdf

http://castle.eiu.edu/~mathcs/mat2120/index/set03-2x3.pdf

Here is the cheat sheet from one of the above pdf file:-

Debugging Flow For A Process

I've been stucked with a job which took a lot longer than what it is suppose to take to complete. A friend of mine shared his gems of tricks on how he troubleshoot it, and with a little bit of tweak to my taste, I've came up with a flow(well, almost all of it still from him :p) which I'm logging it here so that I won't forget it.


#1 Find the offending process id (_pid_)

ps -aux | grep job_name

#2 Look at the entire hierarchy of the pid and look at where it stops

pstree -pulna _pid_

#3 Look at the trace of the running program.

strace -t -s 22222 -p _pid_

#4 Look at the read/write IO activities 

cat /proc/_pid_/io

Useful Links

http://www.linux-tutorial.info/modules.php?name=MContent&pageid=84
http://chadfowler.com/blog/2014/01/26/the-magic-of-strace/

Quotes Within Quotes In Linux

I keep forgetting this every time even though I have stumbled across this so many times.

I'm now gonna stick this here so that I can refer it back and hopefully remember this for good.

http://stackoverflow.com/questions/1250079/how-to-escape-single-quotes-within-single-quoted-strings

Basically, the idea is to ....

always just replace each embedded single quote with the sequence: '\'' (that is: quote backslash quote quote) or '"'"' , which closes the string, appends an escaped single quote and reopens the string. 

 https://stackoverflow.com/a/1315213/335181


Putting the above into a perl script works wonder:

#!/usr/bin/perl -pl
s/'/'\\''/g;    ### or s/'/'"'"'/g;
$_ = qq['$_'];

Ocean 2nd steroid jab this year

Ocean's gingivitis has come back 3 weeks ago.
It had became worsening until the stage that he hasn't been eating for yhe past 3 day.
We decided to bring him in to Hope Vet for another steroid jab. The previous one he had was slightly 2 months ago.

He has been improving a lot ever since. He even asked for food, which is a good sign. But having steroids every 2 months is really not a good thing for thr organs. We hope that could change.

We bought a tube of OROZYME. It is something like a toothpaste. All you need to do is squeeze 1cm out and rub it on him hand, so that he licks it. According to the doctor it acts like an enzyme which kinda breaks down dental plaque and weaken the bacteria.

We r giving this to Hiro and Nala too. Let's see how it works in another month or two.

Nala ' s blood test

We just received Nala 's blood test results last Friday from Hope Vet.
It doesn't look good.
The vet wanted to do more tests to her. And we asked some questions, the vet said that Nala ' s case isn't going to get better.

That's when we decided not to let her have to go thru any more stress unnecessarily.  We want her to enjoy and stay happy all the time. And that's what we will be doing.

From now on, I'm going to spend more time with Nala. I've Uninstalled my smartphone game. And I'm gonna spend more time with nala and see her thru. I have confident that Nala will have many many more happy years to go.

I plan to journal down all the sweet memories that we will be having.

Introducing Hiro to our home cats - Day 8

Today's interaction.

We decided to let all of them eat together without any barrier.

It all went quite well at first. Before food were served Nala even sniff at Hiro 's ass and allow Hiro to smell him back.

But somehow at one point after the food are all finished, I think, Hiro proceed to approach Nala too quickly and that triggered Nala to get agitated and showed Hiro some hissing and scratching.

We quickly separated them again.

And then, Danielle suggested that we let them sniff at each other by putting Hiro in a cage.

Everything seems to be going quite well. I was afraid that Hiro might get stressed up, but somehow he was quite calm all the while. Nala and ocean were the ones that showed their ears backwards instead, especially Nala.

But the good thing is there was not hissing and aggression showed for thr entire 30min exercise, until at one point where Nala tried too hard, and Hiro started hissing,  and that the point where we decided to call it for the day.

https://youtu.be/YLgVKV7D1VI

Introducing Hiro to our home cats - Day 7

Decided to let Hiro meet with Ocean and Nala face to face. ....but with tight supervision.

That room is Hiro ' s room. And I'm holding Hiro tightly as he seems to be very eager to wanna approach Nala and Ocean.

Surprisingly Ocean suddenly came over and walked past us, entering into Hiro ' s room. I'm not sure if that is a good thing, but no hissing from Hiro and Ocean, so I'm taking that as a positive progress. :)

With Ocean in the room , I carried Hiro out and let him stay put on a side , so that Ocean has a larger space to exit the room , and also Hiro has a better view of both Nala and Ocean.

After a while, Ocean decided to leave the room and sit down at the hall, 3 feet beside Nala. Both of them seems at ease and relaxed :)

I kept holding Hiro all the time, and after a while we decided to call it for a day.

We plan to continue with this exercise for the rest of the week, before letting them get Contact and sniff each other at freely.

Here is a Video taken from outside of the room of Hiro.

https://youtu.be/bm8qmB58M3M