## psychology – Interview questions about triggers of users behaviour

We are conducting user interviews with some of our existing customers that use our travel app to book their trips. One thing we are exploring during these interviews is what kind of information or media might trigger a need to travel among customers.

At the moment we have phrased a question, as something like this

"Do you recall any information or media that may have triggered a need that inspired you to make travel plans"

it’s still early but from the few responses, seems we are not getting the answers we are looking for. I’m wondering if we are asking the right questions, or as these mental triggers are unconscious, would they be even able to recall this.

How could ask a better question to understand what triggers a need for our customers to travel?

## questions using linear search – Computer Science Stack Exchange

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• Making statements based on opinion; back them up with references or personal experience.

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## calculus – I need your help guys wo solve inverse laplace questions

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• Making statements based on opinion; back them up with references or personal experience.

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## computer vision – A few questions regarding simCLR

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• Making statements based on opinion; back them up with references or personal experience.

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## dnd 5e – Heat Metal – Questions about the components

### The manufactured metal object is the target of the spell.

Heat metal says:

Choose a manufactured metal object, such as a metal weapon or a suit of heavy or medium metal armor, that you can see within range. You cause the object to glow red-hot.

So we are choosing a piece of manufactured metal we can see, and we are targeting it with the spell.

### The iron and flame can be replaced by a component pouch or spellcasting focus.

A piece of iron and a flame are the components of the spell (and separate from the metal target of the spell). You need these two things to cast it. But they can be provided by a component pouch or spellcasting focus. The component pouch description says:

A component pouch is a small, watertight leather belt pouch that has compartments to hold all the material components and other special items you need to cast your spells, except for those components that have a specific cost (as indicated in a spell’s description).

So whatever you need to produce the flame required for heat metal is in there, and it’s probable a piece of flint to strike on the iron.

The rules also permit a focus to be used instead:

Casting some spells requires particular objects, specified in parentheses in the component entry. A character can use a component pouch or a spellcasting focus (found in “Equipment”) in place of the components specified for a spell.

If you don’t have a focus or component pouch, it will be up to the DM. The rules speak about handling components with your hands, though I don’t think it would be unreasonable to allow the flame to be within reach (5 feet) to fulfil the requirement.

## Excel: how to move “answers” rows into under column “questions”?

How do I move answers from other column to same question under another column, can any one guide the exact formula to achieve this? See example below what needs to be achieved as shown in picture.

## formal languages – Some questions regarding decidability and semi-decidability of $A/B = { w text{ | }exists z in B, wz in A}$

I have found two interesting questions regarding the quotient of languages, described as:

$$A/B = { w text{ | }exists z in B, wz in A}$$

The first one is:

• Let $$A$$ and $$B$$ be regular languages, prove that $$A/B$$ is decidable

By using the proof from this other question, it can be proved that $$A/B$$ is regular if $$A$$ is regular too.

Then, since any regular language is decidable, $$A/B$$ will be regular (and decidable) too.

The second one is:

• Let $$A$$ and $$B$$ be decidable languages, prove that $$A/B$$ is semi-decidable

I have no idea on how to prove this one, I assume that it’s somehow related to $$A$$ and $$B$$ being able to stop for any string, whether it’s accepted or rejected, but since I don’t know whether $$A$$ is regular or not, I don’t know what to do.

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## formal languages – Some questions regarding methods for solving pushdown automata problems

I have found some problems whose solving “patterns” appear quite recently, and I am not sure if the way I’m solving them is the most correct/efficient one:

For example, take this language:

$${w | win{a,b,c}^* text{ with }|w|_a=|w|_b text{ or } |w|_b=|w|_c}$$

The solution would be as follows, where $$\$$ is the bottom of the stack, and $$epsilon$$ the empty string:

The top part is $$|w|_a=|w|_b$$ and the bottom is $$|w|_b=|w|_c$$

Taking the top part as an example (the other one is almost identical), what I do is to push $$A$$ whenever $$a$$ is read and $$A$$ is in the top of the stack, or remove $$B$$ if $$B$$ is in the top.

Whenever $$b$$ is read, I push $$B$$ if I don’t find any $$A$$‘s, or remove an $$A$$ if it’s found.

Then, the rest of the characters without restrictions are read between those, leaving the stack alone.

The string would be accepted if input stops and the stack is empty.

I am not sure if this is the most graceful solution since I basically cram all possible cases in one state, though I think this works. This pattern is used basically whenever I find a restriction such as $$|w|_x=|w|_y$$

The other pattern I found that I’m unsure about is the following one, taking this language as an example:

$${a^nb^m | n=3m}$$

In this one, I push one symbol into the pile only whenever 3 consecutive $$a$$‘s are read, which will be then equal to $$m$$ and be consumed by reading $$b$$‘s, accepting the string again if input is done and the stack is empty.

In these cases, I create a series of states where there is only one symbol pushed (when we enter into them), and the rest force to read a certain number of symbols without pushing of popping anything.

I am uncertain if this is the good way to do it. What if it were to be $$n=56m$$, would I need 55 sub-states?

## Questions on updating statistics and index maintenance jobs

For question 1 – Cancelling or stopping the job after it is doing work will not roll back the work that has already been done, so there is no harm to stop it or kill the execution.

For question 2 – Keep in mind that online index rebuilds do still take some locks and there are limitations involved as to whether an online index can be performed. I would look here for a discussion of those limitations. I probably wouldn’t run this script during the day, even if you can get the online index rebuilds to happen. Index maintenance can be resource intensive.

For question 3 – Ola’s scripts aren’t going to do anything that is going to damage the database.

When I looked at your other question, I had to wonder whether the index maintenance routine is causing the log file growth.

You say, “Because of the problem with the log partition running full after every database update I’ve received a different script which where I can set Proportion of maximum indexes to be maintained per database. But I think this script is not as powerful as olas script, maybe because it doesn’t update statistics or doesn’t rebuild enough indexes? I’ve inserted a lot of new data recently and some querys are really slow since then and it’s up to the database.”

It seems to me that part of your complaint is things run slow after you update and change a large amount of data and people suggested updating the statistics. You could do that with a separate Ola job with T-SQL like the below, which is on his site.

EXECUTE dbo.IndexOptimize
@Databases = ‘USER_DATABASES’,
@FragmentationLow = NULL,
@FragmentationMedium = NULL,
@FragmentationHigh = NULL,