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kandi X-RAY | explanations Summary
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Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of explanations
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QUESTION
Sorry I don't show my variables or anything, tried to give information only pertaining to the questions. This 1 Sub is huge.
Currently my code allows a user to select multiple files, the files selected will be sorted in a specific format, then loaded into 2 different arrays. Currently loads Columns D:E into 1 array and Columns I:K into another array (from selected files QSResultFileWS
, and returns those arrays to my destination FormattingWS
. I'm still trying to learn arrays so if the methodology I used to do this isn't proper, be gentle.
ANSWER
Answered 2021-Jun-14 at 23:12You can use the FILTER
function to remove the blanks.
Replace you lines load the arrays
QUESTION
I am very new to Javascript and am trying to translate a game i made in python into javascript. I am currently trying to get keyboard input for the game. Whenever i run this however it gives me the following error: Uncaught TypeError: Cannot read property '0' of undefined(at line 4 in this example)
Board is a 2d array used to store the board and i have tested that before the addEventListener statement Board is not undefined.
Why is this error happening and what should i do to fix it. As mentioned before i am a complete beginner at javascript so simple explanations would be greatly appreciated. Kind regards
...ANSWER
Answered 2021-Jun-14 at 21:31this
in your code is not what you expect it to be. If block1
etc are local variables, reference them without this.
. If they are members of your encapsulating object, change your callback function to use arrow syntax to let this
reference your object: document.addEventListener('keydown', event => { /*...*/ })
QUESTION
I'm experienced with Pandas but stumbled upon a problem that I can't seem to figure out.
I have a large dataset ((40,000, 16)) and I am trying to group it by a specific column ("group_name" for this matter) and then for each group apply the following rules so it'd merge into one row per group:
- x1, x2, x3 are the "important" columns, if one row has less nulls than the others, take it. (see example with row D)
- If there are conflicts in any column, it's arbitrary and we can pick whatever.
- Combine the nulls on the important fields (x1, x2, x3), see example with row A.
Here is an example with 6 rows that should turn into 4 groups (aka 4 rows).
So far I have
groups = df.groupby['group_name']
I tried many other solutions such as summing each group, applying a transformation, aggregating by each 'important' column, merging on each 'important' column and more. Each solution brought it's own problems so I'm offering this question here without limiting people to a certain way.
Also, I spent nearly two days combining different solutions from other questions but none has seem to work. Perhaps I've missed something.
- Please note that since this is a large dataset, I'd very much like to avoid using
for
loop on each group since efficiency is something to consider here.
I hope I explained everything properly, please let me know if something is unclear.
Code to re-create the dataframe (thanks to @Henry Ecker from the first answer):
...ANSWER
Answered 2021-Jun-13 at 16:35Try with groupby aggregate
'first' to get the first (valid) value from every column for each group_name
:
QUESTION
I am trying to understand the constructor of a std::thread
but fail to understand how parameter types are represented/handled. Judging from cppreference, a simplified constructor could be sketched as follows:
ANSWER
Answered 2021-Jun-13 at 14:24Std thread makes a copy (or move) into a decayed version of the arguments type. The decayed version is not a reference nor const nor volatile nor an array (arrays and functions become pointers).
If you want an lvalue reference argument, use a reference wrapper. The called function in the thread ctor gets an rvalue otherwise; decay copy just determines how the rvalue you are passed in the thread function is constructed from your std thread argument.
QUESTION
Please let me know if I have to provide any more code or explanations.
I am trying to execute validate, if validation not successful, confirm(Yes/No), and then save method for all selected rows in a for loop.
Requirement: I have show a success/failure message after looping through all selected rows. That means:
If 5 rows are selected (2 are valid and 3 are not valid) - got from myService.validate
It will ask if you still want to continue for 3 not valid records - myConfirmService.confirm
It should save those 2 valid records
If user selects 'Yes' in confirm window (lets says for 2 records), then it should save these 2 as well.
At the end - it will display success/failure message - alertService.success
What I want:
To fulfil what I described in the requirement
and The success/failure message should display only once after all record saved
component.ts:
...ANSWER
Answered 2021-Jun-13 at 11:36You could use fork join in this case, so it makes all calls and get the response on a arrays of booleans
QUESTION
I started reading things about java, jvm and so. But when it comes to perm gen memory i keep getting different answers. I really do not get it, and get confused more and more, because there are many explanations that are different. So, is perm gen part of heap or it is not ?
...ANSWER
Answered 2021-Jan-17 at 02:18First of all, modern JVMs do not have a PermGen.
The PermGen was dropped entirely in Java 8. So there is really little point in learning about it. All versions of Java prior to Java 8 are end-of-life, and you should have migrated your code a long time ago. And if you are having problems with PermGen in a legacy application on a pre Java 8 JVM, that is another reason to port it1.
The (Java 7 and earlier) PermGen is described by different people / sources as either:
- a separate heap, or
- a separate region of "the heap".
Both of these descriptions are true, depending on your perspective. The facts that are not open to debate are:
- The PermGen heap (or region) was sized separately from the rest of the "regular" heap. Thus there was a risk of running out of PermGen space even there was regular heap space available.
- The PermGen was garbage collected ... with one or two exceptions. The thing was that it was garbage collected infrequently, on the assumption that there would be minimal garbage in the PermGen to actually collect.
The PermGen was used for class metadata, and (prior to Java 7) for the string pool used for string objects that corresponded to compile-time string constants (e.g. literals). In Java 7, the string pool was moved to the regular heap.
1 - OK. Sometimes, upgrading is not possible; e.g. due to legacy hardware, or customers who refuse to do the sensible thing. But for those cases, you should avoid the kind of new code development that may introduce new PermGen problems. And you should eschew the kind of dev/test/deploy practices (e.g. hotloading) that can lead to PermGen leaks.
QUESTION
ANSWER
Answered 2021-Jun-13 at 08:29Method 1: Using after:highlight
callback
QUESTION
I am trying to extract Hindi text from a PDF. I tried all the methods to exract from the PDF, but none of them worked. There are explanations why it doesn't work, but no answers as such. So, I decided to convert the PDF to an image, and then use pytesseract
to extract texts. I have downloaded the Hindi trained data, however that also gives highly inaccurate text.
That's the actual Hindi text from the PDF (download link):
That's my code so far:
...ANSWER
Answered 2021-Jun-08 at 14:46It seems the module pdfplumber
does the work:
QUESTION
I'm trying to send verification emails when someone fills a form on my website and I'm achieving this using nodemailer.
And my node.js code looks like this:
...ANSWER
Answered 2021-Jun-05 at 18:23I think the issue is you are creating a new connection for each request, just do
QUESTION
As a Java beginner, I have read several articles and some answers regarding List
on SO, but cannot see any explanations what List
exactly is and when to use it? Could you please clarify this issue?
ANSWER
Answered 2021-Jun-11 at 10:54This mean that you can init your list, with list of any type extending MyType.
Here a JUnit to show you :
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