Greek0
Joined 9 years ago
Karma
226
Submissions
37
Member since
Jan 3
Recent submissions
Comment · 3 years ago
You can have debug symbols even in release builds. With gcc, `-ggdb` for debug symbols and `-O2` for optimization can be selected in dependently of each other. Optimized binaries are a bit harder to debug, but locating the source of this crash should be easy even in optimized versions.
As additional complication, debug symbols are often removed from the binary post-build to reduce binary size. The `strip` utility either discards debug symbols entirely, or it puts them in a separate folder as .dbgsym filses. See the gdb `debug-file-directory` option and the `add-symbol-file` command.
Comment · 4 years ago
Development feedback—intended to help team members learn and improve—needs an environment where the recipient can absorb information. This requires psychological safety: no blame, no pressure, no personal attacks, no consequences, no reason to get defensive.
Performance evaluation—informing employees how happy the company is with their output—is a high-stakes and high-stress situation that precludes learning.
Comment · 4 years ago
Do you have a link where to find the talk?
Comment · 4 years ago
The author speaks with an authoritative voice and presents the content as facts. Sadly, the article also contains factual errors. For example:
> This capacity could also be served by a fleet of just 40 737s [...], of which Boeing makes more than 500 per year. Bought new, this fleet would cost $3.6b, and with a lead time of, at most, a few months.
Boeing has a backlog of 4000 planes.[1] Current delivery lead times are 5-10 years, so getting 40 planes within months is ludicrous. Aircraft might be available on shorter timelines from aircraft lenders, but probably not in that timeframe either. It's also not what the article argues.
This puts a question mark over the content: which parts are actually correct and which are merely presented as fact without any checking?
[1]: https://en.wikipedia.org/wiki/List_of_Boeing_737_MAX_orders_...
Comment · 4 years ago
Staging changes: git add -p and git diff --cached
Rewriting history: git commit --amend
Rewriting history: git rebase -i HEAD~10
Atomic commits
Commit messages
Git branching patterns
Comment · 5 years ago
Do we know who the stack-smashing Aleph One was?
Comment · 5 years ago
As of January 2021, SHA256 repositories are supported, but experimental. They can be created with `git init --object-format sha256`. If I understand correctly, they don't mix at all with SHA1 repositories (i.e. you can't pull/push from/to between SHA1 and SHA256 repos).
See https://stackoverflow.com/questions/65870508/git-and-sha-256
Comment · 5 years ago
Organic synthesis is about making new molecules that haven't existed before. That's important for developing new drugs, improved batteries, better plastics, etc.
Organic molecules are networks of atoms, with both a distinct connectivity pattern, and a specific 3D orientation [1] of the atoms to each other. See e.g. the Wikipedia page of Lipitor[2] a picture of the connectivity pattern.
We build these molecules through chemical reactions. Over time, we have become pretty good at creating the connectivity patterns we want. However, achieving the correct 3D arrangement is still challenging.
List and MacMillan developed new chemical reactions that enable us to get both the connectivity, and the 3D aspect right. Such new methods are frequent Nobel contenders, and won e.g. in 2001 with Knowles/Noyori/Sharpless.
As for how these reactions work: it is true that they are catalyst-based and that catalysts speed up reactions, but that perspective is a bit misleading. The key point is that without catalysts, these reactions would not happen at all. So the catalysts List&MacMillan found accelerate some desirable reactions so much that they turn from "practically doesn't happen at all" to "done in an hour".
Congratulations to the outstanding work, and to the Nobel price!
[1]: See https://en.wikipedia.org/wiki/Chirality_(chemistry) for a deeper look [2]: https://en.wikipedia.org/wiki/Atorvastatin [3]: For a deeper look at the chemistry, check out https://www.nobelprize.org/uploads/2021/10/popular-chemistry... and https://www.nobelprize.org/uploads/2021/10/advanced-chemistr... -- also shared by _Microft
Comment · 5 years ago
Thank you for your in-depth answer. This really seems like a problem in search of a better solution.
Thanks as well for writing up your story, it was indeed a good read. I with you all the best with your health!
Comment · 5 years ago
I've been wondering a few times about how to best search the medical literature given a set of symptoms. How did you search for and find your particular disease?
Comment · 5 years ago
Cooley-Tukey Fast Fourier Transform can be complex to implement, if you want to optimize it. A basic version is surprisingly simple, I implemented it for fun in Python a couple of years ago:
def fft(x):
N = len(x)
if N == 1:
return x
assert N % 2 == 0
E = fft(x[::2])
O = fft(x[1::2])
X = [None] * N
for k in range(N // 2):
tf = np.exp(-2j * np.pi * k / N)
X[k] = E[k] + tf * O[k]
X[k + N//2] = E[k] - tf * O[k]
return X
[1]: https://greek0.net