brandmeyer

5 ms·

1.
by brandmeyer 2mo ago
It shouldn't, under the assumptions they are opening up with. Inverse square law twice is appropriate for an approximation that the reflection is entirely diffuse because you assume that the diffuse reflection is uniform in all direct
2.
by brandmeyer 3mo ago
Some day we'll get CREATE TABLE ... ( ... STORAGE ORDER COLUMN MAJOR) to have our transactional cake on the tables that need it and eat our analytics cake on the tables that need that. But until then, separate tools for separate purpos
3.
by brandmeyer 5mo ago
The vast majority of POI churn information comes from streetview + machine learning object detection + automatic change detection + human verification. There are many clever algorithms in play through the entire pipeline. As moats go, its
4.
by brandmeyer 6mo ago
> they (might) have a float, and are using the `==` operator, they're doing something wrong. Storage, retrieval, transmission, and serialization/deserialization systems should be able to transmit and round-trip floats without l
5.
by brandmeyer 6mo ago
Repeating the exercise with something that is exactly representable in floating point like 1/8 instead of 1/10 highlights the difference.
6.
by brandmeyer 7mo ago
They are very similar to the pros and cons of having a monorepo. It encourages information sharing and cross-linkage between related teams. This is simultaneously its biggest pro and its biggest con.
7.
by brandmeyer 1y ago
You can't even express static rounding in C. You can't even express them in the LLVM language-independent IR. Any attempt to use the static rounding modes will necessarily involve intrinsics and/or assembly.
8.
by brandmeyer 1y ago
Nothing major , just some oddball decisions here and there. Fused compare-and-branch only extends to the base integer instructions. Anything else needs to generate a value that feeds into a compare-and-branch. Since all branches are comp
9.
by brandmeyer 1y ago
Any argument that is filled with this much ragebait should be dismissed out of hand.
10.
by brandmeyer 1y ago
ISPC suffers from poor scatter and gather support in hardware. The direct result is that it is hard to make programs that scale in complexity without resorting to shenanigans. An ideal scatter-read or gather-store instruction should take ti
11.
by brandmeyer 1y ago
Shout-out to the NOAA GFS team, who publish the GFS analysis directly to AWS S3. https://registry.opendata.aws/noaa-gfs-bdp-pds/
12.
by brandmeyer 2y ago
> And I suppose you could write a validator to make sure that this worked. Like this one! https://clang.llvm.org/extra/clang-tidy/checks/bugprone/argu...
13.
by brandmeyer 2y ago
> introduced by PWM dimming, but why would that be a low enough frequency to bother people? The human fovea has a much lower effective refresh rate than your peripheral vision. So you might notice the flickering of tail lights (and dayt
14.
by brandmeyer 2y ago
clang-format and clang-tidy are both excellent for C and C++ (and protobuf, if your group uses it). Since they are based on the clang front-end, they naturally have full support for both languages and all of their complexity.
15.
by brandmeyer 2y ago
LUTs are commonly used in geodesy applications on or near the Earth's surface. The full multipole model is used for orbital applications to account for the way that local lumpiness in Earth's mass distribution is smoothed out wit
16.
by brandmeyer 2y ago
Exactly what order and degree were you using to evaluate the model? Variations in drag and solar pressure are more significant than the uncertainty in the gravity field for objects in LEO somewhere much less than 127th order (40 microsecon
17.
by brandmeyer 3y ago
> "^integer" which is better than "int" I agree that it reads a little better. But as a small-handed person, it is unfortunately much more uncomfortable to type.
18.
by brandmeyer 3y ago
> isn’t a standard in that protobuf doesn’t care Shove protobuf into Something Else that does packet delimitation for you. I'm fond of SQLite for offline cases as a richer alternative to sstable.
19.
by brandmeyer 3y ago
Shout-out to Firefox Multi-Account Containers, which Just Works (TM) for exactly this use case.
20.
by brandmeyer 4y ago
This comment is a fantastic example of the meta-battle which the tech industry has been waging. They have worked very hard to change the very questions in the privacy debate. In their terms, collection of the data itself is never under de
21.
by brandmeyer 4y ago
Running multiple test builds in parallel isn't all that difficult, though. One with ubsan, one with asan, and one (opt-in on a test-by-test basis) with tsan.
22.
by brandmeyer 4y ago
> There aren't connections in SQLite like there are for network-connected DBs (eg MySQL) The handle named `db` in your example is as expensive to create as a connection in the relative sense and should be optimized the same way in y
23.
by brandmeyer 4y ago
Its even optional in ARMv7-A and Cortex-A9 doesn't have it.
24.
by brandmeyer 4y ago
Big family house in the suburbs with aggressive demand scheduling (ie, we let the temp float a fair amount when nobody is home) versus high-efficiency car.
25.
by brandmeyer 4y ago
For my case, it was worse. When normalized to dollars, I spent nearly 2x more in HVAC expenses compared to driving's fuel costs, and that's with a modest commute (20 miles). Its much less energy intensive to air condition one la
26.
by brandmeyer 4y ago
Not surprising, though. The issues surrounding if/how a system provides libraries of any kind (static or shared) are completely implementation-defined. The Standard doesn't have anything to say about them at all except for the p
27.
by brandmeyer 4y ago
Hear, hear! Galileo and BeiDou behave similarly to GPS in this respect. Oddly enough, all three time bases have an origin that is specified in UTC, but model elapsed seconds since that epoch. So GPS time does include the 9 leap seconds wh
28.
by brandmeyer 4y ago
Almost all of the ionosphere's total thickness is below 550km, so the lower altitude doesn't matter. Starlink sees less impact from the ionosphere because the carrier frequencies are higher, and dispersion is proportional to 1&#x
29.
by brandmeyer 4y ago
> Regular GPS precision due to ionosphere changes is too low. ... for single-frequency receivers. Military receivers have been dual-frequency for a long time. GPS L2C's rollout is pretty slow (and L5 is even farther behind), but G
30.
by brandmeyer 4y ago
It depends strongly on how the phased array is being steered. If the components prior to phasing and summation are saturated by the interference then phased array beamforming will not reject the interference.

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