## How to scatter plot from matrix with many y-axes values for each x-axes value?

Consider matrix

``A = {{0, 2.54343, 3.566, 4.2323, 2.3434}, {0.1, 6.432, 4.6465, 5.656,  1.34},  {0.2, 0.3423, 1.6342, 3.323, 2.04}}; ``

X-axes values are 0, 0.1, 0.2.

Their are 4 y-axes values for each x-axes data point

How to plot this?

Naive use of

``ListPlot[A] ``

fails.

## Using Lubuntu so many updates but bluetoot not working

Using Lubuntu so many updates but bluetooth and Urdu in Firefox is the issue.

Bluetooth is not found. On Windows side I am using bluetooth. my laptop is HP 450 G0.

\$ lspci -nnk | grep -iA2 net 03:00.0 Network controller [0280]: Ralink corp. RT3290 Wireless 802.11n 1T/1R PCIe [1814:3290] Subsystem: Hewlett-Packard Company Ralink RT3290LE 802.11bgn 1×1 Wi-Fi and Bluetooth 4.0 Combo Adapter [103c:18ec]

## Kernel driver in use: rt2800pci

04:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 0c) Subsystem: Hewlett-Packard Company RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [103c:194b] Kernel driver in use: r8169 Kernel modules: r8169

AND

\$ rfkill list 0: phy0: Wireless LAN Soft blocked: no Hard blocked: no

Why this process is not automatic or not sorted out yet in 18th version?

No adapters found message is what I get when I click grayed bluetooth icon

## How many IDs do we need for web applications?

My thought is that there are several problems that IDs in general need to solve.

1. Primary Key. The best version of this is an autoincremented bigint. It’s ideal for not only being the PK, but also the best candidate for indexes, foreign keys, and–if you need this at some point–sharding.

2. But if your database needs to communicate with some service (internal or external doesn’t really matter), then monotonically increasing bigints are not reliable. A uuid is preferable when your DB might need to talk to another DB, which could be either SQL or NoSQL.

3. And if you need any given table to be displayed to the public, you do not want to leak any information about the structure of your database or the count of records you may or may not have. So a truncated hash of the uuid might be acceptable, or maybe even a truncated Base64 encoding. But in any case, what you need to display to the public should not give any insight into the size or structure of your internal database.

Item 1 is obvious. You probably need a primary key, and serial(bigint) is probably a good way to go.

Item 2 I’ve seen objections because it’s not needed and therefore a waste of space.

Item 3 has been objected to because you can just compute the public ID when needed, so why bother storing it.

My question is this: Is there any reason you wouldn’t want to store 3 IDs?

The way I see it, either your web app will never get big enough for the storage space to matter, or you will be incredibly happy you took that space when your app gets big. It’s like Pascal’s wager but for web apps and services. At least, that’s how I see it.

## HELP too many partitions on mac!

i don’t know what i did and how to delete all the partitions to one disk and i don’t want to see on diskutill all the disk’s… please help, What do I need to write in the terminal to delete everything? imac 27 late 2017… thanks..

## How many souls does a multiheaded creature have?

How many souls does a multiheaded creature have?

Ettins have multiple heads. Does one resurrection spell revive both heads of the Ettin? What happens if one head is willing to be revived and the other is not? Does the Magic Jar spell allow you to possess both heads or only one?

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## Best way to exchange data from one to many nearby phones

I want to create an App where several people in close proximity with an android or ios phone can exchange a small amount of data with one person. So one person is the group leader, and (s)he transmits the name of the group to the other participants. I was thinking of using NFC but I have not been able to find out if iphones can transmit a value (it seems they can now read NFC tags – but I have not seen any examples of writing that data). I could use QR codes (so the leader shows the QR image and the others scan that image). Or I believe there are blue-tooth and wifi options. But I want it to be a very simple action – so turning on bluetooth/wifi and connecting sound like they are too long-winded. Any alternatives, suggestions?

## How many consuls are there in US consulate?

Not so long ago I was getting a visa in the US consulate general in Krakow. The security referred to the officials at the windows you are called to when you number is called as ‘consuls’. However, I had been under the impression that there was only one consul per consulate (and that city and region).

I did some research on usembassy.gov but I could only find some info on ‘Key Officers’ at https://pl.usembassy.gov/embassy-consulate/krakow/sections-and-offices/

Now, key officers in Krakow according to usembassy.gov include Consul General, Consular Chief, Management Officer, Regional Security Officer and Public Affairs Officer. This info indirectly indicates that there is only one consul in the Krakow consulate.

Do all US consulates have exactly one consul?

## How many weapons can I coat with the 1/2 ounce of basic poison from an alchemy jug?

One of the the liquids than an alchemy jug can produce is 1/2 ounce of basic poison. However, there is no indication in the item’s description of how much you can do with this amount of poison. In the description for a poison vial, it says you can coat 1 weapon or 3 pieces of ammunition with the poison from one vial, but it doesn’t say how much poison comes in a vial. So, is the half ounce of poison from an alchemy jug intended to be equivalent to one vial? If not, how many weapons or pieces of ammunition can be coated using the half ounce of poison?

## example of infinitely many intermediate field extensions

It is well known that $$\mathbb{F}_{p}(X,Y)/\mathbb{F}_{p}(X^{p},Y^{p})$$ is not generated as a field extension by one primitive element, hence it has to have infinitely many intermediate fields of degree $$p$$ (assume $$p$$ a prime number) over $$\mathbb{F}_{p}(X^{p},Y^{p})$$. I think that such fields are of the form $$\mathbb{F}_{p}(X^{p},Y^{p},f(X,Y))$$ for some $$f$$ polynomial in two variables over $$\mathbb{F}_{p}$$. How do we show that such fields are infinitely many or how to concretely exhibit otherwise infinitely many intermediate subfields?