Rth | Norm Matloff 's Rth package | GPU library
kandi X-RAY | Rth Summary
kandi X-RAY | Rth Summary
Rth is a package of functions written in [Thrust] callable from R. It thus provides to R programmers a set of parallel applications that run on both GPUs and multicore systems. Thrust is a C++ package for parallel processing. It was originally designed as a high-level approach to GPU programming, but actually can be compiled to multiple backends—GPUs (CUDA) and multicore (OpenMP, TBB). This ability to have the same parallel code run on both GPU and multicore systems is extremely valuable. (You need not have a GPU to run the multicore backends.). Operations are high-level, such as sorting, selecting, searching and prefix scan. From these basic building blocks, a myriad of parallel applications can be coded. For example, consider Rth’s rthorder(), which (in one of its options) serves as a parallel version of R’s rank(). It first calls Thrust’s sort_by_key() function, and then uses Thrust’s scatter() function to permute the results in a way that produces the proper ranks. R programmers can use Rth without knowing C, Thrust, OpenMP or CUDA! But those who do know C/Thrust can easily develop their own apps using the Rth approach.
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QUESTION
Ultimately I am trying to retrieve substrings from file paths which match a particular pattern of characters and numbers. But at this point I'm just trying to get my pattern matching correct. The issue is that I don't always know how many characters are in parts of the matching strings.
For example, the broad pattern is: All uppercase followed by underscore, 4 digit number, underscore, and then mix of upper/lowercase characters and numbers.
filepath/here/of/unknown/length/THISISTHEPATTERN_1111_Iwanttomatch/......
so far, I have tried variations on re.compile(r'\b[A-Z]+_\d{4}_[a-zA-Z][0-9]*')
however this still captures cases where the UPPERCASE part of the pattern is interspersed with lowercase characters.
Here is a test case:
...ANSWER
Answered 2021-Apr-21 at 18:14The test output shows that your regex is working perfectly to your stated pattern:
QUESTION
I am working on some code for an online bible. I need to identify when references are written out. I have looked all through stackoverflow and tried various regex examples but they all seem to fail with single books (eg Jude) as they require a number to proceed the book name. Here is my solution so far :
...ANSWER
Answered 2021-Mar-26 at 14:50It does not match as it expects 2 characters using (([ .)\n|])([^a-zA-Z]))
where the second one can not be a char a-zA-Z due to the negated character class, so it can not match the s
in Jude some
.
What you might do is make the character class in the second part optional, if you intent to keep all the capture groups.
You could also add word boundaries \b
to make the pattern a bit more performant as it is right now.
See a regex demo
(Note that Jude is listed twice in the alternation)
If you only want to use 3 groups, you can write the first part as:
QUESTION
I am trying to run a query in snowflake:
...ANSWER
Answered 2021-Mar-12 at 19:26So correlated sub queries can normally be turn into some form of join in you case the primary things you are doing is matching on two columns and selecting what appears randomly (if you have more than 1 row in active=false state) a row, this can be turned into a row_number() and using QUALITY as the equivalent as LIMIT.
Thus:
QUESTION
I have a dataframe like:
...ANSWER
Answered 2021-Mar-08 at 15:37I don't see a way to split the column, but you can use a combination of left_join()
and mutate()
to achieve the desired output.
QUESTION
I'm trying to pack a script that contains these external imports:
...ANSWER
Answered 2021-Jan-05 at 23:23After playing around with it for about an hour, I've come to a solution. I added --hidden-import "pywin32"
to the pyinstaller command, and it worked! So if uninstalling and reinstalling doesn't work, try adding "pywin32" as a hidden import.
QUESTION
I'm having trouble with Pandas groupby functionality and Time Series. I've read the documentation, but I can't see to figure out how to apply aggregate functions to multiple columns and calculate the mean of the volume (average) of the „aggregate “ correctly.
This is my code for import the CSV File:
...ANSWER
Answered 2020-Dec-31 at 14:07Does this work for you:
QUESTION
I am trying to encrypt a password in python and decrypt it in java springboot application using the jasypt library through jasypt plugin.
What i have done so far
- For simplicity i have used a zero salt and a fixed iv
- I have written the python script to perform the encryption using hselvarajan's pkcs12kdf ...
ANSWER
Answered 2020-Jun-25 at 08:53PBEWITHHMACSHA512ANDAES_256
applies PBKDF2 to generate the key. Encryption is performed with AES-256, CBC.
The (originally) posted Jasypt test function used RandomIvGenerator
, which creates a random IV. For the salt, ZeroSaltGenerator
is applied, which generates a salt consisting of 16 zero bytes.
To implement the Python function you are looking for, it is best to use a fixed IV, e.g. with StringFixedIvGenerator
. StringFixedSaltGenerator
provides a corresponding functionality for the salt (FixedStringSaltGenerator
has the same functionality but is deprecated since 1.9.2). StringFixedSaltGenerator
and StringFixedIvGenerator
encode the passed string with UTF-8 by default (but another encoding can be specified), so that the salt (or IV) 0000000000000000
is hex encoded 0x30303030303030303030303030303030
.
Note that a fixed salt and IV may only be used for testing. In practice, a new random salt and a new random IV must be used for each encryption. Since salt and IV are not secret, they are usually concatenated with the ciphertext on byte level (e.g. in the order salt, iv, ciphertext) and sent to the receiver, who separates the parts and uses them for decryption.
If the same parameters (especially the same salt and IV) are used on both sides, then encryption with Python and decryption with Java works.
Encryption with Python (PyCryptodome):
QUESTION
I have a timeseries dataframe and I need to create a boolean column if the time is between certain hours of the day. I am able to get an array with the matching index location, but how do I turn that into a boolean column? Is the indexer_between_time method the quickest way of doing this calculation?
aapl.csv
...ANSWER
Answered 2020-Nov-01 at 22:15Use np.where its faster:
QUESTION
I want to concanate the data from TABLE1 to TABLE 2
TABLE 1
...ANSWER
Answered 2020-Sep-10 at 14:38In the simplest case, like @jarlh said, you can just do an update:
QUESTION
I am writing a sql where I am trying to pull out information of the status of the courses the user has enrolled. I am trying to return single record for each user. Two fields in the select list would derive the value in the following manner
CourseResultStatusId - If the status of all the courses is passed then return the status as passed otherwise. If any status is fail, the overall status is fail. If any of the status is expired, then overall status is expired. If any of the status is in-progress then overall status is in-progress
ExpiryDateTime - Training expiring (nearest date) I need to apply the following logic on courses he has been assigned. cr.ExpiryDateTime > GetDate() and cr.ExpiryDateTime <= dateadd(dd,30,getdate()) )
If you see below , the query I have written so far pulls the courses that each user has been enrolled but it is not a cumulative result. Do I need to group, if yes would need help.
...ANSWER
Answered 2020-Jun-01 at 21:41If I followed you correctly, you can implement the priorization rules on the overall result of each user using conditional aggregation.
Starting from your existing query, the logic would be:
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