I can't describe how petty it is to delete a post over strongly worded condemnation.
The damage dealt to students by garbage explanations far, far outweighs the hurt feelings from an insult. The real insult is being forced to pay for this garbage, with years of work. And I don't even get to complain?
It's not my fault teachers don't care about teaching, or were brainwashed into complacency with superficial knowledge. If you're homeless, it doesn't matter, you're only paid for competence - and there's zero competence in the answers I received.
Why does it happen? Because I'm disrespected.
Reading comprehension deficit, toward me
My writing is being downvoted and disputed in comments without being read. At least that's the kindest interpretation - here's case by case.
Case 1
In Do symmetric signals have zero phase?, I write,
- Even-sampled zero phase: attained by symmetry about $N / 2$, ignoring sample $n=0$. This amounts to two "don't care" points, one at $n=N/2$ and other at $n=0$.
- Odd-sampled zero phase: same, but only one don't-care. Visually this is a flatline as opposed to a spike in even case.
and provide visuals. Hilmar writes,
$$ \begin{align} \text{even: }&& x[-n] &= x[n] \\ \text{odd: }&&x[-n] &= -x[n] \end{align} $$
With minimal thought, one sees, we're saying the exact same thing. Yet Hilmar sits at +7, while I at -4, and I didn't get a single upvote. Why?
Because Hilmar's "your boy" or whatever, and opens his answer as if contradicting the point in the question, or contradicting my answer. Meanwhile, my Q&A is meant to address the obviously misleading choice of terminology "symmetric", as noone outside of or new to SP would consider this "symmetric":
Then there's Marcus saying scipy, MATLAB and Wiki are "just tools" for acknowledging the concept of DFT-symmetry, and one of those comments is upvoted and there's zero disputes.
Case 2
In DFT coefficients meaning?, I originally wrote that DFT gives phases and amplitudes of sines that sum to the original signal. Firstly, that's equivalently true in the real case, but I admit it's flawed, and was quick to fix it. Despite that, nobody who downvoted bothered to retract it, there's still -3. Unless they think that the central claim, that it's amps & phases of complex sinusoids, is wrong, I have the right to my intuitive interpretation in the rest of the answer, and I don't see such downvotes toward other posts of this kind.
Case 3
It's harder to argue this one definitively, but I'll include it. MBaz at +5,
That one "can approach theory as closely as one wants on a computer" (at least in many practical cases) is not new. The real engineering question is, what is the cost?
First sentence literally agrees with the thesis of my question (-3), second makes a point I make in the question.
Then Dan in comments also agrees it's doable - exact exchange - then in answer still writes 'not realizable', and "Here is a simple example to demonstrate why there is no physically realizable "brickwall" filter.", followed with plots, where the argument being made is on accuracy not practicality. And of course no downvote or comment from MBaz.
Case *
I don't recall the history of this one, but I'd love to hear how it deserves -4
and +0
in its last form. Not counting this as official "case" because it's not as blatant.
"Rudeness" bad, not for all
Case 4
Here, Dilip Sarwate's response to my (genuine, non-inflammatory) Latex edits is "More nonsense", sitting at +3
. And here, I'd like to introduce the concept of - Would you say it to Matt L? No, I reckon it'd look more like "Matt, a lil' typo in brackets there".
There's more examples, I won't dig up everything. Point is, it wasn't just one user (+3), it'd not be said toward a respected member, and it'd sure as hell not be +3 if coming from me to Dilip's question.
Reading comprehension deficit (cont'd)
Case 5
In the deleted post, I
- acknowledge there's signals for which $|x(t)|^2$ is meaningfully instantaneous energy, and contrast against cases for which it's power instead. Despite that, RBJ provides a different but conceptually identical example -
+4
. Why? - acknowledge $P = IV$ argument from electronics, with units and everything. Despite that, Dan recites the exact same information, followed by irrelevant tangents on "power vs energy signals" -
+2
.
Why I called it garbage
I want to be clear, I'm not particularly ticked at Dan and RBJ - I'm ticked at the combined community response. Anyone has right to write lazy answers, or lazily interpret the question - but that's not all that's happening.
What's happening is history repeating, and again, people refusing to actually read what I wrote, or outright denying it as if religiously or politically - and approving of responses that completely ignore the ideas I carefully presented. It's disrespect. And I have to put in extra work, re-explaining myself in bits and pieces - and even if I do, odds are good, the network just moves on and refuses to retract their disapproval.
If not for the ad-value of this network, I'd leave.
So, what can be done? Hell if I know. I'll change this ridiculous username soon enough, for one, don't worry. Besides that I figure I'll stop martyring for education and ignore content I find problematic. But not completely, I won't be allowed to.
I ain't flawless
Yeah, I also have a history of talking sharp and not fully 'professionally'. But I never treated anyone like this.