The Big Programming Thread - Page 887

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Thread Rules
1. This is not a "do my homework for me" thread. If you have specific questions, ask, but don't post an assignment or homework problem and expect an exact solution.
2. No recruiting for your cockamamie projects (you won't replace facebook with 3 dudes you found on the internet and $20)
3. If you can't articulate why a language is bad, don't start slinging shit about it. Just remember that nothing is worse than making CSS IE6 compatible.
4. Use [code] tags to format code blocks.

Deleted User 3420

24492 Posts

June 03 2017 18:38 GMT

#17721

oh, that's smart but obvious after hearing it
thanks!

Manit0u

Poland17838 Posts

June 06 2017 10:49 GMT

#17722

Very interesting presentation for anyone who's into web dev.

Edit:

Uh, oh! Someone had to have a lot of fun writing that


def call(*args, &block)
  tuples =
    if hooks?
      prepared =
        if curried?
          apply_hooks(before_hooks, *(curry_args + args))
        else
          apply_hooks(before_hooks, *args)
        end

      result = prepared ? execute(prepared, &block) : execute(&block)

      if curried?
        if args.size > 0
          apply_hooks(after_hooks, result, *args)
        elsif curry_args.size > 1
          apply_hooks(after_hooks, result, curry_args[1])
        else
          apply_hooks(after_hooks, result)
        end
      else
        apply_hooks(after_hooks, result, *args[1..args.size-1])
      end
    else
     execute(*(curry_args + args), &block)
    end

  if one?
    tuples.first
  else
    tuples
  end
end

Thaniri

1264 Posts

June 07 2017 18:55 GMT

#17723

Just got a DevOps job starting in September. I've got about 3 months to become a master of Linux/Bash. Company uses Ubuntu so that's what I'm gonna be installing on my PC.

Anyone have any advice on how to learn this shit as fast as possible?

Deleted User 3420

24492 Posts

June 07 2017 22:45 GMT

#17724

the current homework im doing is probably the hardest anything ive ever done, lmao

gonna upload it if any brave souls are willing to review in a couple hours

Deleted User 3420

24492 Posts

June 07 2017 23:51 GMT

#17725

okay i actually don't want to upload my pdfs right now, but I can put what answers I got

i didn't do the challenge question (yet)

http://www.cs.umd.edu/class/summer2017/cmsc351/hwk2.pdf

my solutions

+ Show Spoiler +

1a: n-1

1b: [sum of k=1 to n (sum of i=1 to k: of k-i)] + n-1
eventually after a lot of simplifying and some tricks I had to find online I arrived at 1/6(n-1)n(n+1)

2a: n

2b sum of i=1 to n-1 of i + sum of i=1 to n-2 of i + n-1
after simplifcation = 2n(n-1)

2c: still working on it, having some trouble. I have a formula for a given case i,j where i is the left index and j is the right index, but the problem is I need to generalize it for the average i, j
gotta figure out how to do that... but have a pounding headache

can I generalize it with the sum of j=2 to n of the sum of i=1 to j-1 of: whatever the rest of my work is
and then divide all of that by the total number of combinations [i think n(n-1)/2 ?... yeah, n choose 2]

CecilSunkure

United States2829 Posts

June 08 2017 00:07 GMT

#17726

read post wrong

Manit0u

Poland17838 Posts

June 08 2017 06:30 GMT

#17727

On June 08 2017 03:55 Thaniri wrote:
Just got a DevOps job starting in September. I've got about 3 months to become a master of Linux/Bash. Company uses Ubuntu so that's what I'm gonna be installing on my PC.

Anyone have any advice on how to learn this shit as fast as possible?

I don't think you can become master of anything in 3 months... Especially DevOps...

I don't want to discourage you but you'll have to acquire a TON of knowledge. It's not just Linux and Bash, you'll most likely need to also know how to set up routers, firewalls (entire network stack basically, from intranet to distributed cloud systems), automated backups, databases, Docker, ssh, LDAP, continuous integration, continuous delivery, high availability, high recoverability and what not. Also, working on servers is quite different than working on desktop in Linux.

A good starting point would be setting up another comp that would work as a server and playing around with that. You might also learn some Python/Ruby for scripting purposes and vi/vim because you'll almost exclusively work from a console and you might need a good editor (nano just doesn't cut it in the long run).

Here are some books for starters:
https://www.amazon.com/Phoenix-Project-DevOps-Helping-Business/dp/0988262592
https://www.amazon.com/DevOps-Handbook-World-Class-Reliability-Organizations/dp/1942788002
https://www.amazon.com/DevOps-2-0-Toolkit-Containerized-Microservices-ebook/dp/B01BJ4V66M
https://www.amazon.com/Practical-Vim-Edit-Speed-Thought/dp/1680501275

More resources:
https://github.com/Leo-G/DevopsWiki
https://www.fullstackpython.com/devops.html

I think you should start here: https://github.com/Leo-G/DevopsWiki/wiki/Devops-Interview-Questions

Just work the list and educate yourself on each topic.

[image loading]

Acrofales

Spain18425 Posts

June 08 2017 07:58 GMT

#17728

On June 08 2017 08:51 travis wrote:
okay i actually don't want to upload my pdfs right now, but I can put what answers I got

i didn't do the challenge question (yet)

http://www.cs.umd.edu/class/summer2017/cmsc351/hwk2.pdf

my solutions

+ Show Spoiler +

Your answers seem right.

Re 2c: the average case is that they are half a list apart... that should help

Deleted User 3420

24492 Posts

June 08 2017 11:36 GMT

#17729

On June 08 2017 16:58 Acrofales wrote:

Show nested quote +

Your answers seem right.

Re 2c: the average case is that they are half a list apart... that should help

You sure?
That's not what I found.

For example, list {1, 2, 3, 4}

There are 3 ways for numbers 1 apart to swap
2 ways for numbers 2 apart to swap
1 way for numbers 3 apart to swap

3+4+3 = 10
10/6 = 5/3 apart, but half a list would be 2 apart

even for 3 numbers
1, 2, 3

2 ways 1 apart
1 ways 2 apart
=4/3 but half a list is 1.5

I ended up just doing the sum of all left indexes to all possible right index:

(j is right index, i is left index, inner sums are using the same idea as 2b)
the sum of j=2 to n of:
the sum of i=1 to j-1:
(the sum of z=i to j-1 of z + the sum of z=i to j-2 of z + (n-1))

this eventually ended up simplifying to 1/6n(n^3+n^2-4n+2)
then I divided by that (n choose 2) combinations

and was left with (n^3+n^2+4n+2)/(3n-3)

which looks about right but I don't know how to possible verify it

Acrofales

Spain18425 Posts

June 08 2017 12:54 GMT

#17730

Err yeah. I derped. The expected distance between two points is (n + 1)/3, not (n +1)/2 as I derpingly thought for a sec.

E: and here is a stackoverflow explanation of why. Just replace the integrals with summations, and because your minimum is 1 and not 0, you will get the +1 in there. https://math.stackexchange.com/questions/195245/average-distance-between-random-points-on-a-line

Deleted User 3420

24492 Posts

June 08 2017 12:58 GMT

#17731

Ah I didn't even put that together actually. I probably could have done it easier with that.

Manit0u

Poland17838 Posts

June 08 2017 15:32 GMT

#17732

Can we have a separate thread for math please? Surely more people could contribute there and we wouldn't mix concerns here...

Thaniri

1264 Posts

June 08 2017 15:33 GMT

#17733

Thanks Manitou, super helpful.

It's an entry level job, so I got in on the basis that I know routing/switching, Bash, and programming.

I don't want to show up and make a fool of myself though.

Deleted User 3420

24492 Posts

June 08 2017 18:52 GMT

#17734

Looks like the time has come. My math is no longer wanted here

I suppose I'll make a big math thread.

CecilSunkure

United States2829 Posts

June 08 2017 19:10 GMT

#17735

I really like the sound of the big math thread. Please make it.

bardtown

England2313 Posts

June 08 2017 22:22 GMT

#17736

I feel like learning a new language, maybe Haskell or Rust, but I can't justify it except as a purely 'for fun' distraction. For game development there's basically no substitute for C++ and for AI/Biology there's nothing as good as Python. Any ideas for a fun project that makes proper use of Haskell's featureset?

Manit0u

Poland17838 Posts

June 09 2017 05:42 GMT

#17737

On June 09 2017 07:22 bardtown wrote:
I feel like learning a new language, maybe Haskell or Rust, but I can't justify it except as a purely 'for fun' distraction. For game development there's basically no substitute for C++ and for AI/Biology there's nothing as good as Python. Any ideas for a fun project that makes proper use of Haskell's featureset?

If you have experience with gamedev in C++ you could try it out in Rust. Easier transition than to Haskell in my opinion and more opportunities to do something that's actually useful outside of purely academic field. If you want to do some AI stuff than you could also go with Lisp or Prolog.

Liquid`Jinro

Sweden33719 Posts

June 09 2017 06:08 GMT

#17738

OK, I've gotta ask because it's driving me a little insane:
I'm taking a python course @ edx (python for data science to be specific), and the instructor keeps creating variables named after built in functions (for example: list = [1,2,3], or sorted = np.array(unsorted)).

.... I thought this was a very basic "don't do this" thing? Or am I wrong and it's not a big deal at all?

Acrofales

Spain18425 Posts

June 09 2017 06:33 GMT

#17739

On June 09 2017 15:08 Liquid`Jinro wrote:
OK, I've gotta ask because it's driving me a little insane:
I'm taking a python course @ edx (python for data science to be specific), and the instructor keeps creating variables named after built in functions (for example: list = [1,2,3], or sorted = np.array(unsorted)).

.... I thought this was a very basic "don't do this" thing? Or am I wrong and it's not a big deal at all?

Definitely a big don't do this. It'll work in Python as long as you don't use a reserved word, because of scoping, but it's horrific coding practice.

dsyxelic

United States1417 Posts

June 09 2017 06:57 GMT

#17740

would cs algorithm/problem discussion go in the math thread?

say.. for example leetcode/interview-esque problems

asking for the future since I feel like there is programming thread -> math thread with a missing 'CS thread' in the middle which would better suit that

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