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## Playing audio over bluetooth from some sources mutes others

Playing audio over bluetooth from some sources mutes others – Ask Different

## installation – Sources disagree on hashes for supposely identical version when trying to install CUDA 11.2 toolkit

I am new to GPU computing and I am trying to install CUDA on my linux 20.04 focal with kernel 5.4.0 workstation that is equipped with NVIDIA quadro p4000 GPU.

I have followed the instructions in this link:

https://docs.nvidia.com/cuda/cuda-installation-guide-linux/index.html#post-installation-actions

and when I did step 3.8 (sudo apt-get install cuda) I get this message:

Sources disagree on hashes for supposely identical version ‘11.2.2-1’ of ‘cuda-command-line-tools-11-2:amd64’
and when I tried nvcc –version after the installation finished with the above message and a few other similar messages I got nothing which means it didn’t install.

Actually I am trying to do the installation on a remote machine so I was not able to do any restarts during the installation if that is actually needed, because I don’t have access to the physical machine.

## filters – What causes these horizontal lines from light sources?

It’s Lens Flare

Caused by light reflecting inside the lens body itself.
It was technically “a mistake” and something to be avoided until it actually became fashionable in the late 60s.

That particular type of flare is usually caused by an anamorphic lens, which is popular with cinematographers more than stills photographers. They’re used to create the wide screen imagery used in cinema. Amongst the side-effects is a propensity to flare in this horizontal pattern and also to create oval bokeh in out of focus areas. There is additional veiling flare which all lenses will demonstrate – causing the foggy appearance around light sources.
You could call this wrong or an error, but it has become a part of the playbook for cinema photography.

I watched the trailers on IMDB to see if I could spot more instances to determine if they did indeed use anamorphic lenses & I’d say they did, certainly for some of the shots.

Wide horizontal flare

Oval bokeh

There’s an easy guide to its use in cinema on YouTube – https://www.youtube.com/watch?v=_IesAvesFUo

These days it can be recreated in software – it’s built-in to Photoshop as a default plugin.

You can actually buy screw-in lens filters that attempt to recreate some of this look. Such as https://www.vid-atlantic.com/products/cinemorph which contains a lot of examples & demonstrations under the ‘buy me now’ advertising.

I actually own a lens which has been modded to add this structure inside the lens itself, rather than as an optional screw-on.

As a practical demonstration, here’s a quick snap of a torch (flashlight) sitting on the shelf above my computer (with an empty glass to stop it rolling away;)
You can see the characteristic (almost) horizontal line, some veiling flare around the torch itself & an additional reflection pattern lower left. There’s no bokeh example in this – I’d need a second light source off in the distance. This is all in purple/blue because that’s how this particular lens is designed.

## Including point heat sources in a 2D transient PDE heat equation

I want to be sure that I included the point heat sources correctly in my PDE.
The result should be:

I wrote:

``````q0 = 1;
Subscript(Q, 0) =
q0*(DiracDelta(x - x1)*DiracDelta(y - y1) +
DiracDelta(x - x1)*DiracDelta(y - y2)*DiracDelta(x - x2)*
DiracDelta(y - y1) + DiracDelta(x - x2)*DiracDelta(y - y2));
heqn1 = Subscript(k,
CLS)*(D(Subscript(T, D)(x, y, t), x, x) +
D(Subscript(T, D)(x, y, t), y, y)) + Subscript(Q, 0) ==
Subscript((Rho), CLS)*Subscript(Cp, CLS)*
D(Subscript(T, D)(x, y, t), t)
``````

I haven’t considered the time-dependency for the heat source just yet to simplify the notation.

## hash – What are the sources of entropy in blockchain

I have little understanding of what entropy is and its specific role in blockchain. What I understand is that they’re sources of randomness.

From that, I’m able to infer these sources in blockchain will/can be:

• The randomness/unpredictability of getting the correct nonce to get a hash below the target value
• The non-predictability of the transactions that will be picked from the transaction pool to form a candidate block.
• The separate hashes of each [leaf] transaction, their hashes with a paired transaction and the final Merkle root hash.

Is this an appropriate interpretation and application of entropy?

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## apt – Can I install a multiverse package, then disable non-free sources, and still let it upgrade?

I’ve installed a package from `multiverse` and then disabled `multiverse` and `restricted` in apt sources (in all urls). I disabled them so I don’t install any new non-free packages or dependencies by accident.

When I did apt update and then upgrade on the package, apt says it’s “already the newest version”. But I believe I won’t actually get upgrades for that package, right?

Is there a way to get upgrades just for the installed packages while still preventing any new packages from being installed from `restricted` or `multiverse` (without having to edit apt sources on every installation)?

I thought about leaving `multiverse` enabled on `focal-security` and `focal-updates`, but I think that’s probably not gonna do what I expect.

My other somewhat related question:
I want to get a warning when apt installing from certain sources, like restricted and multiverse

## differential equations – How to solve this problem similar to eigenvalue problem but with sources?

I have two coupled differential equations with this structure:

$$f_1(r)partial_r^2h_{00}(r)+f_2(r)partial_rh_{00}(r)+f_3(r)partial_rh_{22}(r)+(omega^2+V_1(r))h_{00}(r)+(omega^2+V_2(r))h_{22}(r)=S_1(r)$$
$$g_1(r)partial_r^2h_{22}(r)+g_2(r)partial_rh_{22}(r)+(omega^2+V_3(r))h_{22}(r)=S_2(r)$$
where all the functions $$f_i(r),g_i(r),V_i(r)$$ and $$S_j(r)$$ are known (and non linear). I have to solve for the parameter $$omega$$ and for the functions $$h_{00}(r)$$, $$h_{22}(r)$$. The boundary conditions are that the functions are bounded in the origin and fall off as $$r^{-n}$$ at infinity.

Without the sources, this is an eigenvalue problem, but I have sources: how do I treat this kind of problem?

For definiteness consider a system of the form:

``````r^-2 D(h00(r),{r,2}) + r^-3 D(h00(r),r) + r D(h22(r),r) + (w^2 + r^-2)h00(r) + (w^2 + 2 r^-2)h22(r) == Exp(-r)
D(h22(r),{r,2}) + r^-1 D(h22(r),r) + D(h00(r),r) + (w^2 + r^-3) h22 ==  r^2 Exp(-r)
``````

EDIT I have been experimenting with `NDEingenvalues` and similar functions: they seem to ignore the source term, I mean the eigenvalues do not change with the source: do I miss something?

## Not able to scrape any working proxies from SB built in sources

Am I suppose to use a proxy when scraping proxies, all of them failed