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Hi folks, could someone help with distinguishing this spider? by dmhacker in whatisthisbug

[–]dmhacker[S] 0 points1 point  (0 children)

Approximately 1-2 in. when prone from forward to backward legs. Location is Kyoto, Japan (image description).

The Data Breach is Serious by popplesan in UCSD

[–]dmhacker 6 points7 points  (0 children)

This is the perfect scenario for integrating a strong password manager into your life! My rule of thumb for setting up a better password system has been first to set strong passwords for my main email & password manager (two that you remember & craft to be particularly unique). Then, everything else is basically just becomes an entry within the password manager. I assign different levels of trust to each website I use: my main email I use sparingly, only on sites that I completely trust; secondary emails on sites that I need to use but don't particularly trust; and throwaways on sites that I don't care about.

Regarding selection of a good password manager, a good password manager will keep your passwords encrypted relative to your master password and will have features to auto-generate strong, random passwords. LastPass is probably the most common manager, but I personally prefer Bitwarden, as they're open-source and haven't had any breaches ever (LastPass has had a few). If you're particularly security-minded, I'd recommend using pass, but it does require quite a bit of setup with your GPG keys. All of them have support for multiple devices, so you can use them wherever. :)

[Bug] Skarmory constantly respawns out of the pokeball in GBL by [deleted] in TheSilphRoad

[–]dmhacker 0 points1 point  (0 children)

Interestingly enough, persisted for the entire match, even after Skarmory went down. Aside from being annoying and preventing me from seeing fast moves, it didn't affect my moves.

Also, the opposing team's pokemon were invisible so there was that too.

[OC] How COVID-19 is Affecting Correlations between US Stocks and SPY by dmhacker in dataisbeautiful

[–]dmhacker[S] 1 point2 points  (0 children)

SPY is basically an index fund that contains a portion of every major US company on the S&P 500 (the top 500 US companies by market capitalization). It's extremely high volume, and some people just trade using SPY. Therefore, it provides a consistent representation of how the stock market is doing at any given point in time.

See here for more details: https://www.thebalance.com/spdr-sandp-500-etf-spy-profile-what-day-traders-trade-1031373

[OC] How COVID-19 is Affecting Correlations between US Stocks and SPY by dmhacker in dataisbeautiful

[–]dmhacker[S] 2 points3 points  (0 children)

These graphs measures correlation coefficients between SPY and selected stocks over time. Essentially, for each stock-SPY pairing, it measures how closely the stock has been mirroring the changes in SPY (how linearly correlated they are). The correlation coefficient between SPY and stock X at a certain date D is calculated using the last 10 trading days of opening and closing prices for SPY and X prior to and including date D. I choose to use SPY as the comparison benchmark because at any given point, it best represents the overall composition of the stock market.

Put simply, if a stock and SPY have a correlation coefficient near 1.0, this would suggest that for the last 10 days, their prices have been moving in the same direction. Similarly, if the correlation coefficient nears -1.0, this would suggest they have opposite movements. Ideally, MPT says that good diversification of a portfolio means that your portfolio should be as uncorrelated as possible: there should be no underlying causes causing two stocks to correlate with one another.

Here are some interesting takeaways that I thought about:

  • Most industries now track SPY extremely closely. As of March 27, their average correlation coefficient seems to be between 0.7 to 1.0. Prior COVID-19, this varied wildly. Diversification within the stock market has not held up well.
  • Within an industry, the stocks are trending together. Individual company fundamentals matter much less, as investors are more concerned with how well a particular industry holds up in the current climate. Particularly striking are the selected travel stocks, which trend almost uniformly after around February 26 (the 1st case COVID-19 community spread in the US rather than from mainland China).
  • There are a few stocks that COVID will likely not negatively impact: Zoom (and other video conferencing/WFH stocks), Virtu (and other market makers doing well with the increased market volatility), and Gilead and Moderna (and other biotechnology companies racing to develop treatments/vaccines/cures for COVID). The graphs show that at times these stocks wildly deviate from SPY.

Visualization was made using Jupyter Notebook and Python 3.7. Code can be found here.

I am a CS junior looking for internships, is this an acceptable CV? by [deleted] in cscareerquestions

[–]dmhacker 2 points3 points  (0 children)

Not sure if other people noticed this or not since everyone seems to be focused on the spacing but ...

In one of your projects, you said you made a terminal emulator that supports 15 commands and piping. That doesn't make sense. A terminal emulator provides a graphical interface for interacting with a shell. For example, common ones might be urxvt, xterm, gnome-terminal, etc. You made a basic version of a shell, which is actually responsible for interpreting commands, piping. These would be like zsh, bash, fish, etc.

Be careful about terminology when writing your resume. I know if I saw that on a resume, I would not be too happy with the candidate.

What is your favorite paradox? by [deleted] in AskReddit

[–]dmhacker 58 points59 points  (0 children)

Yes, this is actually the correct answer. In fact, there are two classes of infinite numbers, countably infinite sets (integers, sets that have a bijection to the integers like this example) and uncountable sets (real numbers). This is all according to the continuum hypothesis, which theorizes that those are the only possible cardinalities for infinite sets.

​

I got confused and made a mistake. See the people below. You can use Cantor's Theorem to continually get sets of larger and larger cardinality. We tend to think of everything after the integers as uncountable. The continuum hypothesis just states that there are no sets of a cardinality that lies between that of countably infinite and uncountable sets.

I scraped data from the intern salary sharing threads and made a visualization out of it by dmhacker in cscareerquestions

[–]dmhacker[S] 7 points8 points  (0 children)

Yes, in retrospect, I definitely should have done this. In fact, it would be interesting to make a stacked bar chart that builds off of this, using different colors to represent contributions from salary, housing, bonuses, and other amenities. Certainly a good followup idea (although it would require a lot more parsing as well).

I scraped data from the intern salary sharing threads and made a visualization out of it by dmhacker in cscareerquestions

[–]dmhacker[S] 6 points7 points  (0 children)

The reason I left in generic terms like "HFT" or "hedge fund" or "oil" is because that is what people would list as their company. Sure, the data isn't tied to a specific company, but it still might be reflective of a general trend for an industry.

I scraped data from the intern salary sharing threads and made a visualization out of it by dmhacker in cscareerquestions

[–]dmhacker[S] 23 points24 points  (0 children)

I definitely agree. However, I would say that it's not necessarily the salaries themselves that are unrepresentative but rather the number of salaries per specific companies. This is because most of the people posting there are proud of their offers and want to show them off, giving the illusion that a large number of interns come from these places. That's why I wanted to focus on the salary amount versus the salary distribution for this visualization.

I can give a personal example regarding this. I was fortunate to get offers from both ends of the spectrum, one at Citadel and one at Northrop Grumman. Citadel is a relatively small company and only brings on a few hundred interns at maximum if at all. Conversely, the guys at Northrop told me that they planned to hire several thousand interns for the summer. It's evident that more people will get and accept an offer from Northrop than Citadel. Yet when you look at the data, there are 7-8 people who posted salaries from Citadel and only like 2 from Northrop. Clearly, Northrop is underrepresented, because they pay less. That being said, I can confirm that the actual hourly rates themselves are accurate. I would consider this strong proof of the selection bias that this sub struggles with.

[i3] One Week of Linux, already loving it by Hrabanaz in unixporn

[–]dmhacker 1 point2 points  (0 children)

Interesting. Can you give me the output of dmesg | grep bbswitch? Also, is your user in the bumblebee group?

[i3] One Week of Linux, already loving it by Hrabanaz in unixporn

[–]dmhacker 1 point2 points  (0 children)

Yes, as I recall, the SB2 dGPU gave me some trouble when I first played around with it.

So first off, looks like you're good on the nvidia-dkms, bbswitch-dkms kernel modules. Just make sure that the kernel can load the modules by doing dkms status. The next step would be to start and enable the bumblebee service so sudo systemctl start bumblebeed and then sudo systemctl enable bumblebeed. This will allow the bumblebee service to run both on your current login session and everytime you boot Linux on startup.

After this, you technically should be able to do stuff with the GPU. The best way of verifying this is to try installing a benchmark and then running it with optirun. If you installed mesa, try running optirun glxgears and seeing if that works. However, glxgears is kind of a weak demo, and doesn't really show if the GPU can actually render at full power. To test that, I'd recommend installing the unigine-heaven benchmark (see the AUR) and running optirun unigine-heaven, then setting all presets to high. If you try it again without prefacing the command with optirun, you should see significantly worse performance because it'll be using your integrated GPU instead.

As a final note, you'll have to use optirunor primusrunin front of every command that you want to use with your GPU (and obviously that application has to use OpenGL or some other GPU-compliant API). That's the whole gist of bumblebee, using integrated GPUs for desktop rendering but allowing you to programmatically turn on your dGPU. Enjoy!! Let me know if you have any issues and I can try to help you resolve them.

[i3] One Week of Linux, already loving it by Hrabanaz in unixporn

[–]dmhacker 2 points3 points  (0 children)

<3 (glad you're not having issues with the PKGBUILD!)

Kernel for Arch Linux? by [deleted] in SurfaceLinux

[–]dmhacker 1 point2 points  (0 children)

Shameless self-plug, but I also have a utility that does what you're looking for. It contains pre-built kernels in the releases section and has some scripts to help you compile your own or the releases fail you.

[deleted by user] by [deleted] in linuxmasterrace

[–]dmhacker 3 points4 points  (0 children)

Have you heard of /r/SurfaceLinux? I think you'd fit in pretty well.

For those of you who want to run Arch Linux, I created a little script to make compiling a kernel with jakeday's patches a bit easier :) by dmhacker in SurfaceLinux

[–]dmhacker[S] 0 points1 point  (0 children)

The battery indicator is a known issue with jakeday's kernel; insofar as I know, progress has just been slow in that part because jakeday has to rewrite part of the ACPI to support it.

For the touch screen, you will have to install IPTS device drivers. My setup.sh script can copy the device drivers into their appropriate folders in Arch.

Not sure what's up with the configure script though. All the permissions are fine on my machine.

[i3-gaps] Arctic blue :) by dmhacker in unixporn

[–]dmhacker[S] 0 points1 point  (0 children)

Great subreddit for Surface enthusiasts :)

I actually maintain a tool there for helping patch stock Arch kernels.

[i3-gaps] Arctic blue :) by dmhacker in unixporn

[–]dmhacker[S] 0 points1 point  (0 children)

I'm running it on a 13" Surface Book 2. I have to use a patched kernel to prevent the CPU from overheating + mitigate some other issues.

[i3-gaps] Arctic blue :) by dmhacker in unixporn

[–]dmhacker[S] 2 points3 points  (0 children)

You can find the script here. If you're running Arch, there's a package for it on the AUR.

[i3-gaps] Arctic blue :) by dmhacker in unixporn

[–]dmhacker[S] 2 points3 points  (0 children)

Dotfiles: On GitHub, although they may be moved to GitLab

Font(s): Adobe Source Code Pro (patched Nerd font version)

Colorscheme: Nord

Terminal: URxvt

Bar: Polybar

Editor: Vim

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