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arriu

654 karma · joined September 22, 2011

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arriu··on Ask HN: Is now a good time to invest in ETFs?
If things keep going at the rate they are right now, the market will need to acknowledge that there is a massive pile of bodies by May 1st*

There are two more questions to ask, is this already priced into the current market? And, will our social distancing be enough to change our current trajectory?

*Source: https://i.imgur.com/YznALHZ.png

arriu··on Bank of America says the recession is already here
Italy has more reported total deaths than China at this point. Spain is also catching up fast.
arriu··on Johns Hopkins CSSE Covid-19 Global Case Dashboard
It is confusing. Is the idea that the circle corresponds to the area that the virus may have spread to locally?
arriu··on The sound of the Hagia Sophia, more than 500 years ago
Truly beautiful, thanks for sharing.

Kind of reminds me of the following bit where deadmau5 talks about reverb and compression to create a sound that goes beyond what the oscillators generate. He plays a tune without, it illustrates a similar effect. (warning: lots of cussing)

https://www.youtube.com/watch?v=vYr6nlqV3oA&feature=youtu.be...

arriu··on Smartphone startups take on Google, Apple and put privacy first
Agreed, but... check out the following app https://www.synology.com/en-us/dsm/feature/moments

I use it in conjunction with Google Photos as a secondary back-up of the original photos (to the local drive and a thrid-party cloud back-up)

arriu··on Dark Mode vs. Light Mode
A few things to call out:

1) Dark mode is increasingly not exclusively about the user experience. We're seeing phones switch automatically to dark mode when batteries are low.

2) Dark mode, at least for email, has better readability by design. The dark mode algorithm swaps foreground with background and then adjusts the colors to be at least at a ratio of 4.5 to 1 (wcag 2 compliance). This means you can have unreadable white text over white background in light mode and it will actually be readable in dark mode. So having discussions about whether dark mode is more readable is kind of pointless, it was designed to be more accessible.

edit: If there is interest, I can share a desktop app that helps illustrate dark-mode changes (specifically for email). https://imgur.com/NOGT5el

arriu··on Show HN: A guitar tab viewer that listens
Looks like a helpful tool! Thanks for sharing!

One thing that was frustrating when learning guitar was figuring out which finger goes where. Even though the tabs show where you need to press, they don't really tell you which finger should go where.

Is this something you would be able to help with?

arriu··on YouTube says it has ‘no obligation’ to host anyone’s video
I agree with others in this thread, we should have more options for where to watch user created content.

With that in mind, can someone at Netflix please figure out a way to enable user created content?

Your customer base is ready for this. You don't need to focus exclusively on creating your own content. You've got the tech in place to support it. Many popular channels on Youtube would be right at home on Netflix. Take a note from Amazon, you don't need to be a book store when you can do much more.

arriu··on Setting up a home VPN server with WireGuard
Tried this, you will encounter a ton of sites that assume you are a bot. You will find it annoying to browse quite a few sites. Some will outright refuse to work.
arriu··on In a swipe at Chrome, Firefox now blocks ad trackers by default
It's not always Firefox's fault. Some websites literally serve different HTML to Firefox, Google services are a good example.
arriu··on What does an unprocessed RAW file look like?
If you want to extract the actual raw data, dcraw doesn't really advertise the way to do it. Many of the options for extracting the data still apply some processing/conversion to the underlying data.

It is a pretty big mess actually. Each manufacturer has different constants that need to be applied to the data, so the raw data from one device is not comparable to another. Convincing dcraw that you actually want the unaltered data is not straight forward.

Anyways, if you really do want to see the raw image, there are a few undocumented flags you can use.

> dcraw -E -4 -T *.CR2

This will give you an unprocessed 16-bit tiff file containing the "raw" data.

What is interesting is that some camera sensors capture data slightly beyond the image you are presented with. The camera will crop in and debayer the image for you, as will your image editor.

See this thread for hilarious lengths people go to in order to get unaltered data from their sensors (monochorme converting a dslr):

https://stargazerslounge.com/topic/166334-debayering-a-dslrs...

arriu··on Python in Visual Studio Code – April 2019 Release
I was going to post the same comment. This is great but I don't actually know anyone who is running django code outside docker at this point.
arriu··on Unveiling the first-ever image of a black hole [video]
The video by Veritasium is by a guy who literally got a PHD on the subject of making physics more approachable through videos. He is exactly the person I would expect to provide a more clear and understandable explanation.

https://www.youtube.com/watch?v=S1tFT4smd6E&feature=youtu.be...

arriu··on VS Code on a Remote Server
This might be a ridiculous question but I'm looking for a way to do windows C++/C# development from a mac. Is there any chance this might allow such a workflow? Unfortunately, I need to access some pretty low level dll's that are not cross platform compatible at all.

I use a mac for all other development except for this project. I have nothing against windows, just looking to simplify my development workflow across all projects.

arriu··on Man says CES lidar’s laser was so powerful it wrecked his camera
Is there any research material to support these claims? I can't imagine the energy and optics involved would have been sufficient to do this. Seems like coincidence to me. The sun has far more energy than what we're talking about here.

I'm happy to be proven wrong though as I wouldn't want something unsafe on the streets as much as anyone else.

arriu··on The faster you unlearn OOP, the better for you and your software
This does read nicely in most cases.

There are minor issues when you venture off and decide that it would be cool if a monsters could damage your weapon. Something like Monster.hits(Weapon).with(Weapon). You'll start wondering if Weapon should inherit from the player base class. If not, you'll spend time wondering how to share the code to keep things dry. Obviously there are many solutions even within OOP, but one might consider looking to ECS to remove code duplication and decouple things.

Lots of good examples in the game programming patterns book: http://gameprogrammingpatterns.com/component.html

arriu··on Show HN: Trigonoparty – JavaScript trigonometry visualization
This is awesome! It might also make sense to draw out the sine or cosine curves as the point moves about the circle.
arriu··on New Zealand travellers refusing digital search now face $5k Customs fine
This sounds troubling and it's a little disappointing to see comments suggesting "factory resets before travel" or "dual booting". These are not things anyone really wants to have to do.

Also, this issue raises some more questions:

1) It sounds like they might use a device to scan your hardware automatically, potentially opening the door to copying files for permanent record

2) It is a small step from here to install tracking software on your device (as China is doing in some places)

arriu··on From Autoencoder to Beta-VAE
Not sure if this helps but, looking at the footer, there is a link to the git repository for the blog: https://github.com/lilianweng/lil-log/tree/gh-pages

Also, "Built by Jekyll and minima".

arriu··on Stellarium Web: Online Planetarium
How are you guys constructing the DB from the catalog? Do you plan to grow it?
arriu··on Stellarium Web: Online Planetarium
I was expecting a lot more code, you guys did a great job cleaning up and reducing the original desktop codebase.
arriu··on Stellarium Web: Online Planetarium
Where can we find the C source to the stellarium-web-engine.js file? thanks!

edit: It looks like this is it https://github.com/Stellarium/stellarium-web-engine

arriu··on Step-by-step code execution on the Toshiba FlashAir SD card
These things are pretty interesting but they are quite slow/unusable in terms of transfer rate.

I wonder if that tiny antenna could be enhanced with a wire.

arriu··on AMD Creates Quad Core Zen SoC with 24 Vega CUs for Chinese Consoles
You could build something like this with a 2400G today: https://imgur.com/IWMqyRR

It is very small as far as custom PCs go, pixel 2 provided as a size reference.

arriu··on Light painting animations directly from Blender
How would someone without access to a milling machine go about making custom aluminum parts like these?

I've had a couple projects that would benefit from aluminum milled parts, but I haven't been able to figure out how to go about making 1 or 2 parts without spending hundreds on setup or tooling costs.

arriu··on What We Learned from Analyzing 100M Bugs
Agreed, I was excited to find out whether data about the bugs could have been used to predict future bugs.
arriu··on Supersharp Images from New VLT Adaptive Optics
Thank you for the link, there that is one hell of a reference. Please share more if you have any others handy.

I wonder how much of that work would be generalizable through specialized neural nets: https://arxiv.org/abs/1702.00403

arriu··on Supersharp Images from New VLT Adaptive Optics
Can you tell us about your favourite globular clusters? I know some of them have very interesting properties like having similar stellar ages but are there any really peculiar ones you can tell us about? Also, I'd love to see some of the images your referring to.

Thanks!

arriu··on Supersharp Images from New VLT Adaptive Optics
This is very exciting. I'd love to see some of this make its way into amature equipment.

Technology has helped us go past what would have been though of as possible with similar optics equipment 50 years ago. For the most part, optical mirrors and lenses are the same but what we can now do with them has changed quite a bit.

For example, here is a video of Mars through a small telescope: http://i.imgur.com/8juHPdn.gifv

If we take the best parts of each video frame in that video and combine them in a smart way, a process called lucky imaging, we can reduce the impact of the atmosphere: http://i.imgur.com/CzLZTlv.png

arriu··on How to Survive When Money Is Worthless [video]
I feel like the authors should have picked either narrated video or text, not both. I couldn't get through this, too painful.
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