magento2 – Magento 2 Installation in GoDaddy Shared Hosting

I have just installed Magento in my GoDaddy Shared Hosting and get this error:
Directory /home/xxx/public_html/xxx.com/ecommerce/generated/code/Magento/Catalog/Controller/Adminhtml/Product/Index/ can not be created.
Class Magento Catalog Controller Adminhtml Product Index Interceptor generation error: The requested class was not generated correctly because the & # 39; generated & # 39; Directory permission is read-only. If — after running the command & # 39; bin / magento setup: di: compile & # 39 ;, if the permission & # 39; generated & # 39; directory is set to write — the requested class was not generated correctly, you must add the generated class object Only the signature of the associated construct method.

The permissions for all directories have been changed in 777.

Linear Algebra – Exercise with $ GL (V) $, which shows that the group for $ dim V geq 2 $ and $ F neq {0,1 } $ is not commutative

In my lecture scripts we introduced the general linear group. We already know that $ L (V, V) = {f: V rightarrow V | f text {is linear} } $ is a ring with unity and therefore $ GL (V) = {x in L (V, V) | x text {is invertible} } $ is a group. I do not understand the proof of the above statement in the script:

proof

I do not understand why $ A_2 ^ {- 1} = A_2 $, there $ A_2 (A_2 (v_1)) = A_2 (-v_1) $

What I do not understand here is the definition of $ A_2 $ we have that $ v_1 neq-v_1 $ and therefore $ A_2 (-v_1) = – v_1 $, On the other hand, a linear map is uniquely determined by the values ​​of the basis vectors and thus $ A_2 $ has to be linear and that means $ A_2 (-v_1) = – (A_2 (v_1)) = v_1 $,

But then we have $ v_1 = -v_1 $, This is not the case, for example $ V = mathbb {R} ^ 2 $

Can someone tell me where I am wrong?

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magento2 – Error resetting the Magento 2 connection while processing large amounts of data

I use Magento 2.3 in Ubuntu 16.4 with Apache Server. I sync data from Dropbox csv to Magento 2 attributes. Everything works fine, but I have more than 17,000 SKUs and I need to process them in a single shot.

My code below.

public function downloadcsv () {
$ curl = curl_init ();

curl_setopt_array ($ curl, array ()
CURLOPT_URL => "https://content.dropboxapi.com/2/files/download",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "POST",
CURLOPT_HTTPHEADER => array (
"Authorization: Owner DropboxAuthorizationKey",
"Cache control: no cache",
"Content Type: Text / Plain",
"dropbox-api-arg: {" path  ": " / test.dat  "}",

)
));

$ response = curl_exec ($ curl);
$ err = curl_error ($ curl);

curl_close ($ curl);

if ($ err) {
echo "cURL Error #:". $ err;
} else {

// echo $ response;
$ fp = fopen ("/ var / www / html / csv / test.csv", "wb");
fwrite ($ fp, $ response);
fclose ($ fp);
}

}

Function csv_to_multidimension_array ()
{
$ objectManager =  Magento  Framework  App  ObjectManager :: getInstance ();
$ filename = & # 39; / var / www / html / csv / test.csv & # 39 ;;
$ delimiter = & # 39 ;, & # 39 ;;

$ result = array ();


$ keys = array (& # 39; sku & # 39 ;, & # 39; Description & # 39 ;, & # 39; LocalStock & # 39 ;, empty1 & # 39 ;, gross price & # 39 ;, & # 39; & # 39; Discount & # 39 ;, & # 39; Net Price & # 39 ;, Specials & # 39 ;, & # 39; Group & # 39 ;, Minor Group & # 39 ;, & # 39; empty2 & # 39 ;, empty3 & # 39; empty4 & # 39 ;, & # 39; cost & # 39 ;, empty5 & # 39 ;, & # 39; ; Division # 39; # 39; # 39; '39', '39', '39', '39', '39', '39', & # 39 ;, & # 39 ;, & # 39 ;, & # 39 ;, & bar; 39; National Stock & # 39;);

foreach (file ($ filename) as $ key => $ str)
{
// if ($ key == 0)
//     continue; // skip the first line

$ values ​​= str_getcsv ($ str, ",", & # 39; "& # 39;");

$ result[] = array_combine ($ keys, $ values);

}

foreach ($ result as $ res) {

$ cat_array = explode (& # 39; & $ ​​39; $ res['Specials']);
$ sku = $ res['sku'];
$ productId = $ objectManager-> get (& # 39;  Magento  Catalog  Model  Product & # 39;) -> getIdBySku ($ res['sku']);
$ products = $ objectManager-> create ("Magento  Catalog  Model  Product") -> getCollection () -> addAttributeToFilter (& # 39; entity_id & # 39 ;, array (& # 39; eq & # 39; => $ productId));

if ($ res['LocalStock'] ! = & # 39; & # 39;) {
$ localqty = $ res['LocalStock'];
$ resource = $ objectManager-> get (& # 39; Magento  Framework  App  ResourceConnection & # 39;);
$ connection = $ resource-> getConnection ();

$ sql = "UPDATE inventory_source_item SET quantity = $ localqty WHERE sku = & # 39; sku & # 39; AND source_code = & # 39; sample & # 39;";
$ connection-> query ($ sql);

}

I could update everything with this method, but if the data is big, I could not update. It loads for a long time and gives an error in resetting the connection.

magento2 – Copy a Magento 2 site into a new domain "remembers" the old site

I have has copied a Magento 2 site of a test domain (testing.mytest.co.uk) to a Live Domain (Mylive.co.uk). It's time to update the Magento version (2.2.5 to 2.2.6), and I'll get the following Error in the standby control:

                Unrecognizable paths found:
/var/www/vhosts/mytest.co.uk/testing.mytest.co.uk/var/.htaccess

The reason why it is not writable is that this is not the domain that refers to the current location of the site. It's like "remembering" where it was? And I'm not sure where this needs to be changed.

env.php and core_config_data Have been updated.

Can someone please advise?

Number theory – primes that divide integers of the form $ n ^ 2 + 1 $ or $ n ^ 2 + 3 $

I'm trying to determine a modular condition for the primes that divide $ n ^ 2 + 1 $ and $ n ^ 2 + 3 $ from where $ n $ is an integer.

After research, I found that all primes $> 3 $ are congruent to $ 1 $ or $ -1 $ modulo $ 6 $, Even after some trial and error the following seems to be true:

$ n ^ 2 + 1 $ can not be congruent $ 3 pmod {4} $, and

$ n ^ 2 + 3 $ can not be congruent $ 5 pmod {6} $?

But I have not proved that in any way and I'm not sure how. How can I use this information to create a condition for the primes that separate each of the two expressions? It seems the dividers of $ n ^ 2 + 3 $ The $ p = 2, p = 3 $, or for $ p> 3 $. $ p equiv 1 pmod {6} $but I have not really proven it, I think. Suggestions for further action?

customer – How do I set up address fields in Magento 2?

All I need is the first name, last name, phone number, location, e-mail address, and custom field in address form. However, some of the fields are required for backend validation. I tried creating a plugin for LayoutProcessor and using $ jsLayout, but it does not help. There is also a customer address.
My shipping / billing and customer address form should look like this:
E-mail,
First given name,
Surname,
Telephone number
City (autocomplite),
custom field (autocomplite).

Interaction Design – Credential help with restriction to 2 dependent fields

Lukew has a section on this in his old (but still relevant) book Web Form Design (p. 186)

If the number of inputs is relatively small – one to two additional inputs – this method can preserve the context of a person's original selection and insert the required selection-dependent inputs where most relevant.

Enter image description here

I do not have the larger context of your UI, but it seems that there are only two ways in this section.

If you know the default settings that most users select, you can set them as the first selection.