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No sound from earbuds(3.5mm jack), internal speakers produce sound.(19.04)

I apologize for the limited scope of the details of my problem. I have used alsamixer to make sure that my earbuds are not muted. Upon insertion, plasma indicator automatically switches volume controller to earbuds and mutes internal speakers. My output tests include Plasma Audio Volume control settings, VLC(which does not appear to recognize my earbuds in device selection), and youtube.

Thanks in advance.

Cuando se produce el ClassNotFoundException en ObjectInputStream

si el fichero está vacío se produce una excepción de tipo EOFException y si contiene otra clase distinta a la que quiero leer y castear la excepción que arroja es ClassCastException, por ejemplo:

 persona = (Persona) ois.readObject(); 

Entonces en qué casos se puede lanzar la excepción ClassNotFoundException?

Gracias de antemano.

Un cordial saludo.

How to use file system as cache for products which are expensive to produce?


The consumer client components consume files. They access files in two step:

  • Clients call a REST API with a parameters what they want, and the API responds with a file path.
  • Clients access to the file using file system access.

There are two contradicting constraint: Producing the files has high cost, and takes time, so on demand production them is not an option. However it can be predicted all files will not fit on the storage, there will be more.

My first thought is to start with producing and storing the files, (and serve if there is a request using the API described above), and if the storage is near full the API detects, and starts deleting the less demanded files (based on a strategy, which is out of topic). In case if a file is requested and not on the filesystem yet, produce, store and respond with the path.

So it seems it is a file product cache on the file system.


Is there any open source component which fits to this scenario, of do I have to implement myself?

Can a caster Deliberately Fail Wrest Resources to produce adamantium?

This is a request for a viability check on a spell combo to mass produce adamantium.

My questions are:

  • Is this viable?
  • Am I missing any negative consequences not accounted for?
  • Is there a way to make the Adamantium Stable? I.E. No longer susceptible to Dispel Magic or Flesh to Stone, etc.

Sequence of Events:

  1. Cast Clone or Kidnap a Beggar to use as “Body Fodder” for Magic Jar.
  2. Use Magic Jar on Clone Body or Beggar.
  3. Cast the ritual Wrest Resources. Make sure you don’t have the required skills to successfully complete the spell.
  4. Let your current body be turned into Adamantium via the Flesh To Stone aspect of Wrest Resources.
  5. Let magic Jar Expire, return to your original body.
  6. Cast Restoration on yourself to remove the negative level.

Relevant Quotes:

Magic Jar

the host body is slain, you return to the magic jar, if within range, and the life force of the host departs (it is dead). If the host body is slain beyond the range of the spell, both you and the host die. Any life force with nowhere to go is treated as slain.

If the spell ends while you are in the magic jar, you return to your body. If the Spell ends while you are in a host, you return to your body.

Flesh To Stone

The subject, along with all its carried gear, turns into a mindless, inert statue. If the statue resulting from this spell is broken or damaged, the subject (if ever returned to its original state) has similar damage or deformities. The creature is not dead,

Wrest Resources

Failure: All casters take 6d6 points of damage and are exhausted. The primary caster is the target of a flesh to stone spell (DC = 16 + the primary caster’s Charisma bonus) but instead of stone the spell turns the caster into the resource used in the material component.

Backlash The primary caster takes 1 permanent negative level.

Reference Links:

  • Clone – Used for the “Extra” Body necessary to pull this off with moral ambiguity. Spell target for Magic Jar.
  • Beggar – Alternative spell target for Magic Jar – Evil Alignment Requirement.
  • Magic Jar – Used to get out of our Adamantium body.
  • Flesh to Stone – This is what we want to happen to us.
  • Wrest Resources – The spell we want to fail.
  • Restoration – Needed to undue the negative caster level post ritual.
  • Stone to Flesh – A possible problem spell.
  • What is a reliable source of Adamantium? – The whole reason were doing this.

Using ARRAYFORMULA and QUERY to produce results in multiple columns

I would like to be able to group rows based on unique values and then output the AVERAGE and STDEV values of two different variables for those groups.

Using the table below as an example, I would like to determine the AVERAGE and STDEV of two different variables for each unique ID and type (1a, 1b, 2a, 2b, 3a, 3b).

I received assistance on this problem earlier which combined QUERY and ARRAYFORMULA and it worked wonderfully, but that was only for a single variable. Perform functions (AVERAGE, STDEV) on rows grouped by unique values in Google Sheets.

Using the same formula twice adds additional unique value columns. This not only adds additional clutter, but also seems it could introduce additional errors if the unique ID columns don’t match or aren’t aligned. If possible, I would like to ensure that the calculations are being pulled from the same set of unique IDs. Using the table below, the intended output would produce a column for the unique IDs, and then columns for “AverageLength” “LengthSD” “AverageWidth” “WidthSD”.

ID Type L   W 1   a   5   9 1   a   7   8 1   a   9   3 1   b   2   4 1   b   4   1 1   a   6   3 1   a   9   8 1   b   8   5 1   a   1   2 2   a   5   2 2   a   2   1 2   a   4   7 2   b   6   6 2   b   7   5 2   a   8   9 3   b   1   2 3   b   7   4 3   a   5   3 3   a   6   6 3   a   8   9 3   a   9   3 3   b   4   5 3   b   6   4 3   b   3   1``` 

Does real linear programming produce bipartite perfect matching using maxflow reduction?

Given a bipartite graph the standard reduction to max flow is with the construction similar to following diagram:

enter image description here

We can formulate max flow as an linear programming problem with integer variables in latter.

  1. If we do not use integer variables does solving for maxflow in linear programming formulation with only real variables still produce valid perfect matching of given graph?

  2. Is there a formal proof of this?

Can a ring of spell storing and access to Find spells produce an endless menagerie?

This is looking at what appears to be a somewhat bizarre rules exploit, and attempting to determine if it is, in fact, viable under the rules.

Premise: We have a Bard who likes having friends – a lot of friends. He has Find Familiar. At level 10, he takes Find Steed and Find Greater Steed as his magical secrets and the DM has given him a ring of Spell storing.

Now, it’s pretty clear that by himself, he can have one Familiar, one Greater Steed, and one Steed (perhaps a mastiff, because he wants a dog, and can’t ride two things at once). We’ll say that he chooses a hawk as his familiar.

Can the bard allow the creatures summoned by the spells to attune to and use the ring of spell storing containing Find/Familiar spells to summon Steeds/Familiars of their own?

A DM might adjudicate that a hawk/mastiff/griffin has no fingers and cannot use a ring, but Polymorph is available to a Bard of that level, and seems like it should be able to handle the issue for the Steed and Greater Steed. (I’m not sure if there are any beasts of low enough CR for the familiar that would have something appropriately finger-like.)

Is there a reason why the dog would not be able to have a perfectly loyal griffin of its own? Is there any real limit to the potential pyramid of perfect loyalty/obedience that would result?

This is in some ways similar to the linked question, and may have the same answer, but it is distinct on a couple of points. The first is that the linked question is about the Pact of the Chain familiar, most of which have obvious fingers already, as compared to the generic Familiar, Steed, and Greater Steed. The second is that this question is specifically about the three Find spells, which seem like they might be a special case – it’s not merely about whether your dog (polymorphed into an octopus/monkey/whatever) is able to cast the spell, but whether they are able to permanently maintain the found creature afterwards. In particular, this seems to severely break the intended limit of one steed, greater steed, and familiar per PC, and it seemed like there might be some further limit in place preventing it from working out this way.