## Are all the rotation dies that rotate by the same angle similar?

I was trying to get a hunch about the concept of similarity of two matrices looking at the set of rotations that are similar to a given rotation. My thoughts on this:

Any rotation can be specified by an axis and an angle $$( hat {n} _1, theta_1)$$, with $$theta_1 in (- pi, pi)$$. If a rotation with different parameters $$( hat {n} _2, theta_2)$$ is given, a basic change can be made so that this new rotation, when it is plotted on the new coordinate axes, has the same axis (and therefore the direction of rotation). Then the rotations are the same with respect to the coordinate systems if and only if the angle of rotation is the same. I guess two rotations with angles $$theta_1, theta_2,$$ with $$theta_1 + theta_2 = 0$$ are also equivalent, as the axis could be flipped on the other side to give the same rotation.

Thus, it appears that two rotations are equivalent if and only if, looking at the rotation from an aligned or anti-aligned coordinate system with the axis, they rotate by the same angle. However, this is just intuition. Is the conclusion correct? If not, what is the correct conclusion here?

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## query performance – What database for a web application with similar requirements like file sharing / storage services?

I am currently working on a web application that allows manufacturers to upload files (technical drawings of products), which they can then share with suppliers so that they can produce the corresponding parts.

From now on, I use the database to store information related to the user / company account. In addition, each time a file is downloaded, a reference, in which the AWS bucket is stored, is saved to the database (in other words, I use the database to find where to retrieve the requested information). Due to the nature of the application, it will be much more required to read data than to write it.

Not knowing much about the database, I started to create the back-end of my web application using a no-sql database (mongoDB). By extending the functionality of the back-end, I introduce a lot of dependencies and therefore queries. The data accessible depends on the company to which a user belongs and on the relation of this company with other companies, etc. Therefore, entering all of these queries will likely slow down my app considerably as the user base grows – please correct me if I'm wrong.

Therefore, I want to ask which database would you recommend using for such an application?

Sincerely, Samuel

## Most crypto exchanges have a similar API. What software (commercial or open source) do they use in their back-end?

If I want to start a crypto exchange today, which companies should I look for who can provide me with ready-made software infrastructure when I don't want to create one in-house?

I'm talking about the match engine, API, etc. The trading software for the exchange spine.

## nikon – How to convert JPEG to RAW in Photoshop or similar?

You cannot (should not) produce a crude from a jpeg. Theoretically, this would be possible because the compressed NEF is based on a TIFF container and a "large" JPEG / JFIF IIRC variant.

And all is not lost because, after having organized this kind of competitions, I can say that you can always participate according to the type of competition and why they want raw files …

The requirement may be there because the contest is for unmodified images – this is common with photojournalism contests where only general or minor changes are allowed.

More likely, the requirement is there to discourage cheating, which has plagued the amateur / competitive world. Assuming everyone takes raw photos (and some people don't – and no, I never understood that), organizers often allow you to provide the original unmodified jpeg on which you based input because actual inputs are usually requested at a specific pixel size.

Some organizations post such requirements under the guise of “ quality '', although this is mainly false because (even now) few devices are able to go beyond 8 bits per channel. From my observation, it is mainly to keep "beginners" at bay. From experience, I have seen many events request a 24/48 bit lossless RGB TIFF for display then on a horrible DLP projector that does not have the tonal response to make a calibration worthy of. # 39; be tempted (if they had attempted one, which is much less likely than you might think).

In any case, even if the rules are listed, they are generally aimed at maintaining fairness and will have a reservation that the organizers have discretionary power over submissions. You must contact the organizers and explain to them that your original has been shot in JPEG as they can always allow you to enter.

And good luck in the competition!

## Any forex broker (or similar) with no overnight fees for Bitcoin?

Does anyone know something like a Forex broker that I can use to invest in Bitcoin with no overnight fees? I just want to buy and sell in a few months, maybe more than a year. If this can only be achieved by using no leverage, I am satisfied with it.
Thank you!

## database – automate document upload, switch from Word to Excel or similar

People, I hope you understand that this is a special situation. This is a question that doesn't follow the rules, but right now the world is a mess and I really need someone to be able to help me. Fill me with negatives if you want, but don't close the question.

I work at the Ministry of Security of the Province of Buenos Aires and we handle any complaints regarding COVID-19 by hand. The problem is that this virus is growing exponentially, which is why our work is also growing, and we are behind with the statistics, partly because of this, the known number on cases is less than this that it really is. Without further ado, I will show you what I have:

We received a .doc file (ask in the chat before asking the question here, and they asked me for the version of Word. In fact, we are working with different versions, I have the latest version at home because I'm a student and MS always gives it and updates it), but at work I have 2010, I think the version can be indifferent since I want to work with text, I could even copy it and take it in a notepad for example)

This .doc file contains about 100 texts which have more or less this form

Illicit Investigation – Illicit Point (COVID-19 Coronavirus) – Senior Female
03/19 – PU.81027 – Student 07:06hs – CP Campana; 05: 00hs. he
received a call to XXXX (Dda. XXXX 1000), realizing that his neighbor
XXX, eve of return Brasil, not respecting
isolation protocol. Staff continued to provide
corresponding telephone numbers for these cases, informing
Personal health.

Each of these texts must be transmitted to a table in a database, which includes about 20 fields. I would at least be able to get the 3 data that I put in bold, which is, the urgent part number, which is always after `PU.`, the hour, which is always the one after the word `alta`, and in case there is a country or continent name, extract it (only the first appearance, as it could mean that the person came from Brazil and was previously in Germany)

If you don't know how to do it but you know the tools that can do it, it would also be of great help

The point is, we run them by hand, and this virus grows by leaps and bounds with it, and we can't load it.

The idea is that each new text (could be identified by the appearance of the string `PU.`) create a new row (it can be in an Excel or Access table, whatever) and put these 3 fields.

I hope you understand an exceptional question at an exceptional time. Be careful, don't leave your homes. This is not a joke.

## How do I delete a Google Business listing with a brand name similar to mine?

When I search for my brand name "Branded", I can see a Google business listing on the side, including the map, which takes up space on the page and that’s a entirely different company called "Brannded".

Note: the names are different. The other company is not a competitor. It’s a restaurant, while my business is e-commerce and I cannot apply for Google Business as we don’t have bricks and mortar. However, as these names are brand names not part of the dictionary, they are growing, customers and I do not want them listed.

What can I do?

## magento2 – How to implement a redirect to a personalized success page after submitting a form on a personalized page (similar features such as payment)

I have a submission form and a controller, with the execute method. Right now, after submitting the form, my page reloads and at the top of the page I receive an alert that informs the user of the success or failure of the form. # 39; operation, how can I redirect to a personalized success page?

the `execute` my controller method `app/code/Vendor/Module/Controller/Order/Create.php`:

``````    public function execute()
{
/** @var MagentoFrameworkControllerResultRedirect \$resultRedirect */
\$resultRedirect = \$this->resultRedirectFactory->create();
\$data = \$this->getRequest()->getPostValue();
\$sampleIds = explode(',', \$data('sample_ids'));
if (count(\$sampleIds) >  \$this->helper->getMaxCount()) {
\$this->messageManager->addError(__('The count of "samples" exceeds the limit'));
\$data = null;
}

if (\$data) {
/** @var VendorModuleModelOrder \$model */
\$model = \$this->_objectManager->create('VendorModuleModelOrder');
\$model->setData(\$data);
\$model->setStoreId(\$this->_storeManager->getStore()->getId());

try {
\$this->objectRepository->save(\$model);
\$this->dataPersistor->clear('vendor_sample_order');

// Send email
\$this->helper->sendEmail(\$model);

} catch (MagentoFrameworkExceptionLocalizedException \$e) {
} catch (Exception \$e) {
\$this->messageManager->addException(\$e, __('Something went wrong while saving the data.'));
}
}
return \$resultRedirect->setRefererOrBaseUrl();
}
``````

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