r3 | performance path dispatching library | Router library
kandi X-RAY | r3 Summary
kandi X-RAY | r3 Summary
libr3 is a high-performance path dispatching library. It compiles your route paths into a prefix tree (trie). By using the constructed prefix trie in the start-up time, you may dispatch your routes with efficiency
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QUESTION
I am trying to reduce lines of code because I realized that I am repeating the same equations every time. I am programming a contour map and putting several sources of intensity into it. Until now I put 3 sources, but in the future I want to put more, and that will increase the lines a lot. So I want to see if it is possible to reduce the lines of "source positions" and "Intensity equations". As you can see the last equation is a logaritmic summation of z1, z2 and z3, is it possible to reduce that, any idea?
...ANSWER
Answered 2021-Jun-15 at 15:45You could iterate over certain parts in a loop.
I tried to keep the same format overall and just rearranged the code to show how you might do it.
QUESTION
I run a loop and append data into a list. I failed to convert the list to a data frame in the loop and only able to fix that in a later step and turn every 3 columns into a new row. I was wondering if I can transform a list into a data frame during the loop session.
...ANSWER
Answered 2021-Jun-15 at 15:38Consider building a list of data frames then rbind
once outside the loop:
QUESTION
I know there are some other questions (with answers) to this topic. But no of these was helpful for me.
I have a postfix server (postfix 3.4.14 on debian 10) with following configuration (only the interesting section):
...ANSWER
Answered 2021-Jun-15 at 08:30Here I'm wondering about the line [in s_client]
New, TLSv1/SSLv3, Cipher is ECDHE-RSA-AES256-GCM-SHA384
You're apparently using OpenSSL 1.0.2, where that's a basically useless relic. Back in the days when OpenSSL supported SSLv2 (mostly until 2010, although almost no one used it much after 2000), the ciphersuite values used for SSLv3 and up (including all TLS, but before 2014 OpenSSL didn't implement higher than TLS1.0) were structured differently than those used for SSLv2, so it was important to qualify the ciphersuite by the 'universe' it existed in. It has almost nothing to do with the protocol version actually used, which appears later in the session-param decode:
QUESTION
I am calling BOW function in Python
but after I do so the index of the dataframe changes to 0, 1, 2, 3, ...
My Original Data Fram df_reps_all looks like this
...ANSWER
Answered 2021-Jun-12 at 09:17You can save the old index, then perform BOW
and then put it back:
QUESTION
Out of this Pandas table, I did some work.
...ANSWER
Answered 2021-Jun-12 at 07:18You can use dictionary, with keys "r1"
, "r2"
, etc. For example:
QUESTION
I am inserting data from one table "Tags" from "Recovery" database into another table "Tags" in "R3" database
they all live in my laptop similar SQL Server instance
I have built the insert query and because Recovery..Tags table is around 180M records I decided to break it into smaller sebsets. ( 1 million recs at the time)
Here is my query (Let's call Query A)
...ANSWER
Answered 2021-Jun-10 at 00:06The reason the first query is so much faster is it went parallel. This means the cardinality estimator knew enough about the data it had to handle, and the query was large enough to tip the threshold for parallel execution. Then, the engine passed chunks of data for different processors to handle individually, then report back and repartition the streams.
With the value as a variable, it effectively becomes a scalar function evaluation, and a query cannot go parallel with a scalar function, because the value has to determined before the cardinality estimator can figure out what to do with it. Therefore, it runs in a single thread, and is slower.
Some sort of looping mechanism might help. Create the included indexes to assist the engine in handling this request. You can probably find a better looping mechanism, since you are familiar with the identity ranges you care about, but this should get you in the right direction. Adjust for your needs.
With a loop like this, it commits the changes with each loop, so you aren't locking the table indefinitely.
QUESTION
I am working on a symbolic algebra system. I'm currently looking at how to carry out polynomial addition/multiplication from a binary parse tree. I will later consider this to be a general ring.
Parsing is not relevant here -- this intended to be the output of parsing. The parse tree that is formed. If something could be improved here, I'm certainly happy to learn about that too.
I 'feel' that this tree structure could be folded/crushed, yet I'm not too clear on how to go about it. I believe I can hack something together, but as I'm still learning Haskell, I wanted to learn what the more advanced users would do.
Below is relevant code background.
My two relevant data declarations are:
...ANSWER
Answered 2021-May-03 at 15:35"Fold" has two related but distinct meanings in common parlance.
Fold
as inFoldable
. Viewing the datatype as a container,Foldable
gives you access to the container's elements while throwing away any information about the shape of the container itself. (This is also the sense in whichlens
'sFold
uses the term.) Not every datatype isFoldable
— only those which can be viewed as a container.- "Fold" can also mean "catamorphism", which is a technique for writing higher-order functions which reduce a structure to a summary value. Every datatype has a corresponding catamorphism, but the signature of the catamorphism depends on the datatype.
The two meanings of "fold" happen to coincide when the datatype you're talking about is []
(which partly explains the confusion over the two meanings), but in general they don't. Your Tree
happens to be a suitable candidate for either type of fold, and from your question I can't quite tell which one you're after, so I'll show you how to do both.
The easiest way to write an instance of Foldable
is to turn on DeriveFoldable
.
QUESTION
I have a table like this
A B C D E 1 Co1 Te1 S1 R1 Yes 2 Co1 Te1 R2 No 3 Co1 Te1 R3 No 4 Te2 S2 R4 Yes 5 Te2 R5 NoI'm using the following drag down formula to join and filter D where A repeats
=IF(E="Yes"; JOIN(CHAR(10);FILTER(D1:D;A1:A=A1;D1:D<>""));"")
The result is the following
row/header| F
1| R1
1| R2
1| R3
2| R4
2| R5
There is a way to achieve the same result with an arrayformula?
Link to the real table (column T)
...ANSWER
Answered 2021-Jun-07 at 18:47You should know that in a situation like this, an Arrayformula will not make the sheet faster than a dragdown Filter.
That said, here is the traditional way to solve these problems. Make a new tab. Place this formula in cell B2.
QUESTION
I'm looking to format a phone number in real time as it is typed into a TextField. The goal is to add a "separator" (a space, a dash, a dot...) between the different digits forming the phone number according to the country. By default France : 06 23 65 14 85 But also for other countries as the international format French : +33 6 23 65 14 85 Or the german international format : +xx xxx xxx xx xxx
For this, I have a Listener that looks permanently when a new number is added in the TextField. The program then takes care of detecting the format of the phone number that is being entered, and depending on that, the program uses a "format" that I created myself to modify the format of the string.
The problem is that the user's cursor is constantly moving while reformatting the string. If the user deletes or selects a zone and then deletes it... each time, the cursor moves to the beginning or the end of the string which is very annoying to write.
Would you have a solution to change the format of the string in real time while making sure that the cursor is in the right place? The only alternative I found for the moment is a lib but that seems to be difficult to maintain so I'd rather do it myself. Otherwise I have to wait for the unfocus on the graphic component and change the format after that, but that's not what I want.
I provide you my code below, excuse me if there is a little bit of French in it, I sometimes write some.
...ANSWER
Answered 2021-Jun-03 at 15:46TextFormatter is definitely the way to go. What you need to build is the filter
component for the TextFormatter. Basically, you can think of this as a keystroke processor (that handles mouse actions as well), where all of the low-level stuff has been handled for you. You get a TextFormatter.Change
object passed to you, and you can see how that change will impact the value in the field, and then modify it, suppress it, or let it pass through.
So all of the formatting happens instantly, right in the TextField as you type.
I built one to handle North American style phone numbers, because it's a little more interesting than the European style since it has brackets and dashes. But you can adapt it.
The approach I took was to strip all of the formatting characters out of the string, then reformat it from scratch each time a change was made. This seems easier than trying to fiddle with it character by character. The only tricky part was hitting over a "-" or ")", where I assumed that you'd want to delete the number in front of the special character. It might make more sense to just move the caret to the left of the special character:
QUESTION
I'm trying to figure out how to make a dataframe out of a table I made.
This is what the table looks like stored in a variable:
...ANSWER
Answered 2021-Jun-03 at 16:49We can convert to data.frame
as
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