Tag: Single

Javascript – How can I use vuex-map fields in a single JS file?

For a variety of reasons, I can not use either the ES6 module import or the VUE-CLI compiler for a project I'm working on. Therefore, I use both Vue and Vuex via CDN tags on a static HTML web page.

Vue and Vuex are working fine, but I'm having a problem trying to get Vuex map boxes to work with Vuex.

I tried to copy the functions from the module, i. H. To insert it directly into my JS script:

function arrayToObject(fields = ()) { ... }
function normalizeNamspace(fn) { ... }
function getField(state) { ... }
function updateField(state, { path, value }) { ... }
const mapFields = normalizeNamespace((namespace, fields, getterType, mutationType) => { ... }
const mapMultiRowFields = normalizeNamespace((namespace, paths, getterType, mutationType,) => { ... }
const createHelpers = ({ getterType, mutationType }) => ({ ... }

Then for my shop:

const store = new Vuex.Store({
strict: true,
state: {
    data: {}
},
getters: {
    getField
},
mutations: {
    updateField
}
})

And my component:

computed: {
...mapFields((
'data.item1',
'data.item2',
'data.item3',
'data.item4'
))
}

Unfortunately, I only get one mistake 

(Vue warn): Failed to generate render function:
ReferenceError: Invalid left-hand side in assignment in
with(this){return _c( ... and here's the entirety of my Vue app object notation ... )

Is that repairable?

Integration – double integral with csch or single integral with polylogarithms

Really $ a + b geq $ 2What is the integral of

$ I (a, b) = int_0 ^ infty int_0 ^ infty dxdy frac {x ^ ay ^ b} {x + y} frac {1} { sinh ^ 2 {x}} frac { 1} { sinh ^ 2 {y}} $

With the trick, I can reduce this double integral to a single integral of a product of polylogarithms

$ frac {1} {x + y} = int_0 ^ infty e ^ {- t (x + y)} dt $

and the integral

$ int_0 ^ infty dxe ^ {- xt} frac {x ^ a} { sinh ^ 2x} = (- 1) ^ a2 ^ {- a} (2a text {Li} _ {a-1} (t / 2) + t text {Li} _ {a} (t / 2)) $

to get

$ I (a, b) = int_0 ^ infty dt (-1) ^ {a + b} 2 ^ {- ab} (2a text {Li} _ {a-1} (t / 2) + t text {Li} _ {a} (t / 2)) (2b text {Li} _ {b-1} (t / 2) + t text {Li} _ {b} (t / 2)) $

but then not sure how to integrate that.

Performance Tuning – Possibly more than 1 core when using a SINGLE iterative procedure?

Sorry, if the title is a bit unclear. I hope to clarify below.
Suppose I have a function

myNextNumber[n]:= xxxxxxxx

That calculates the next reviewer I want to try. And I hope to find something with a while statement

z=iniNumber
While[ myfun[z] < 100, z=myNextNumber[z] ]

Well, this loop works fine and slow for a single process myfun[] is pretty complicated.

Is there a way to somehow Fully exploit multi-core / parallelization here? Suppose I have 4 cores to use. So every time I try the next four numbers with 4?

I think maybe I should just do it rewrite myNextNumber[n]so that there is the next one FOUR pay, then I pass on ParallelDo, or something similar. But is it really the best way?

SQL Server query! doubt in SQL Server how to join columns of the same data type into a single one

Good day I start to program on vb.net and have found a problem.

I'm doing a program in which I simulate that I have 3 operations that generate revenue for me.

In the same database I created 3 tables (tabla1, tabla2, tabla3) and all 3 have the same columns: SERIE , OPERACION Y MONTO,
SERIES as IdKey. BUSINESS These are fixed data that are different for each operation: OP1, OP2 and OP3 and the AMOUNT what is a decimal (10,2), Everyone has the same configuration

Now my question is after I tried the program and added data. I expected that when I was consulting in SQL (I'm currently using the Visual Studio Query Generator) I would throw a kind of 3-column table with all the values ​​and at the end the sum of the sums.

Instead, he throws me 9 columns, the 3 from each table.
and I do not know how to search this question directly on Google.

I hope you can help me, sorry if it's something simple, just learn! Many thanks

Can I control the power and group of a single flash with a manual trigger?

… that the YN 560 IV can control and group other wireless flashes, since it is now connected to a wireless receiver?

No, I can not; You can only trigger the flash synchronously.

When the RF-603 II C is used as the receiver, it can not take power or group control. Therefore, there is no way to communicate this to the flash. An RF-605 transceiver can provide group on / off control but not remote power control.

In addition, the Neewer TT560 (which, like the Amazon Basics flash, is probably a renamed Godox TT560) is a single-pole flash with no built-in radio trigger. Everything attached to his foot can only communicate synchronization (fire). The flash can not receive any other signals because it does not have the appropriate pins. Your YN-560IV would behave the same way on an RF-603 II. The group / power can only be controlled via the internal radio transceiver.

If you want a remote control for groups / power supply, you must comply with the models YN-560III / IV / -660 / -560Li, which also have a compatible built-in transceiver.

Topics – How do I set the recommended image size for a single post?

You can set the recommended image size in the second parameter based on this document

// without parameter -> Post Thumbnail (as set by theme using set_post_thumbnail_size())
get_the_post_thumbnail( $post_id );                   

get_the_post_thumbnail( $post_id, 'thumbnail' );      // Thumbnail (Note: different to Post Thumbnail)
get_the_post_thumbnail( $post_id, 'medium' );         // Medium resolution
get_the_post_thumbnail( $post_id, 'large' );          // Large resolution
get_the_post_thumbnail( $post_id, 'full' );           // Original resolution

get_the_post_thumbnail( $post_id, array( 100, 100) ); // Other resolutions

In fact, PHP can not verify the responsiveness of the screen. However, if you want to check whether the user is mobile or not, you can use this feature.

if ( wp_is_mobile() ) {
    echo get_the_post_thumbnail( $post_id, 'large' ); 
} else {
    echo get_the_post_thumbnail( $post_id, 'thumbnail' ); 
}

mysql – Count two different columns from two different tables and throw them into a single variable

I have two tables in my project: "Cats" and "Items". Each item in the Items table has the value "item_cat" (column), which represents the ID of the actual category to which this item is assigned. And every single category in the "cats" table has a unique ID.

When I add a new article, I can choose the category ID, which can only be one of the categories from the "cats" table: "Music" (ID = 1), "Books" (ID = 2) or "Movies" (ID = 3). Article saved: "Pulp fiction" (id = 1), "My fight" (id = 2), "Gone with the wind" (id = 3), "Les miserables" (id = 4), "The Holy Bible" ( id = 5) and "The Best of Tina Turner" (id = 6). Points 1, 3 and 4 belong to category 3, points 2 and 5 belong to category 2 and point 6 belongs to category 1 (I hope I am still understandable;)).

Now I want to count how many items are associated with each category. Is it possible to use "SELECT COUNT" in a combination to get such a result as output: cat1 = 1 (element), cat2 = 2 (elements), cat3 = 3 (elements)? How do you do that?

Thanks in advance for your help!