sof | Sound Open Firmware | Audio Utils library
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QUESTION
This is a question about traversing mutually recursive data types. I am modeling ASTs for a bunch of mutually recursive datatypes using Indexed Functor as described in this gist here. This works well enough for my intended purposes.
Now I need to transform my data structure with data flowing top-down. here is an SoF question asked in the context of Functor where it's shown that the carrier of the algebra can be a function that allows one to push data down during traversal. However, I am struggling to use this technique with Indexed Functor. I think my data type needs to be altered but I am not sure how.
Here is some code that illustrates my problem. Please note, that I am not including mutually recursive types or multiple indexes as I don't need them to illustrate the issue.
setDepth should change every (IntF n) to (IntF depth). The function as written won't type check because kind ‘AstIdx -> *’ doesn't match ‘Int -> Expr ix’. Maybe I am missing something but I don't see a way to get around this without relaxing the kind of f to be less restrictive in IxFunctor but that seems wrong.
Any thoughts, suggestions or pointers welcome!
...ANSWER
Answered 2022-Apr-01 at 22:53I'm assuming here that you're trying to set each IntF
node to its depth within the tree (like the byDepthF
function from the linked question) rather than to some fixed integer argument named depth
.
If so, I think you're probably looking for something like the following:
QUESTION
I am using Perl 5.34.0 and I want to find wether an input is only hebrew letters and some signs like the question mark, etc. Even though I found a solution with a lot of overhead, I would like to learn how to do it simpler with regular expression.
This is my solution without regular expression.
First I defined the Hebrew characters in a constant hash in a Perl module.
...ANSWER
Answered 2022-Mar-24 at 20:47You can use a relatively simple pattern match to do this.
The interesting bit here is the \p{Hebrew}
, which allows you to match every character with a specific Unicode property. The rest is just beginning ^
and end $
of string, and a quantifier +
to say one or more.
QUESTION
I need to create a new branch, from the existing branch using the git checkout
and option start-point
but I am not sure how I can determine it properly.
from git log
I need to find a commit which has specific transaction number in the message.
E.g. from git log
ANSWER
Answered 2022-Mar-21 at 18:02To find a revision that has a certain message you do:
QUESTION
In the below Hibernate generated query, the student_id
and college_id_fk
fields are selected twice, why is it so and what is the purpose? Can this be fixed.
ANSWER
Answered 2022-Feb-21 at 18:01The select SQL that you mentioned is triggered by the eager loading of the students for a college. I briefly trace the source codes and it boils down to OneToManyPersister
to generate the select clauses at here. I have no ideas why the author will generate the select clause which include some duplicated columns for this case, and I don't think there are anything that you can do to change this behaviour unless you use your own patched version of hibernate.
If you really don't want it to happen , my advise is not to use eager fetching for the college 's students. After all , it is a bad idea because eager fetching will introduce N+1 query issue. If you have 100 colleges , such SQL will repeat 100 times to load the students for these 100 colleges one by one after you load the colleges.
To avoid N+1 query issue and the duplicated columns in SQL , you can write a JPQL query to fetch join the college and its students together:
QUESTION
We track an internal entity with java.util generated UUID. New requirement is to pass this object to a third party who requires a unique identifier with a max character limit of 11. In lieu of generating, tracking and mapping an entirely new unique ID we are wondering if it is viable to use a substring of the UUID as a calculated field. The number of records is at most 10 million.
java.util.UUID.randomUUID().toString() // code used to generate
Quotes from other resources (incl. SOF): "....only after generating 1 billion UUIDs every second for approximately 100 years would the probability of creating a single duplicate reach 50%."
"Also be careful with generating longer UUIDs and substring-ing them, since some parts of the ID may contain fixed bytes (e.g. this is the case with MAC, DCE and MD5 UUIDs)."
We will check out existing IDs' substrings for duplicates. What are the chances the substring would generate a duplicate?
...ANSWER
Answered 2022-Jan-20 at 17:28This is an instance of the Birthday Problem. One formulation of B.P.: Given a choice of n values sampled randomly with replacement, how many values can we sample before the same value will be seen at least twice with probability p?
For the classic instance of the problem,
p = 0.5, n = the 365 days of the year
and the answer is 23. In other words, the odds are 50% that two people share the same birthday when you are surveying 23 people.
You can plug in
n = the number of possible UUIDs
instead to get that kind of cosmically large sample size required for a 50% probability of a collision — something like the billion-per-second figure. It is
n = 16^32
for a 32-character string of 16 case-insensitive hex digits.
B.P. a relatively expensive problem to compute, as there is no known closed-form formula for it. In fact, I just tried it for your 11-character substring (n = 16^11) on Wolfram Alpha Pro, and it timed out.
However, I found an efficient implementation of a closed-form estimate here. And here's my adaptation of the Python.
QUESTION
How to hide values that are false ? ( 0, null or undefined)
I have tried to do something like
...ANSWER
Answered 2022-Jan-18 at 16:21You can filter your data beforeHand and use object notation togehter with it:
QUESTION
I am currently learning the use of selenium with python, and tried to collect some data. I have been struggling for the last couple days with clicking on a dropdown not accessible by Select method. I looked at A LOT of questions on SOF, blogs, tutorials ... and could not find the answer to my problem.
The dropdown is accessible to this website <"https://en.volleyballworld.com/volleyball/competitions/olympics-2020/schedule/11349/">, then by clicking on the "Box Score" tab. Just below the teams flags, you'll see the dropdown with "ALL SETS" writing in it.
I would like to access the data from "SET 1", "SET 2", "SET 3". My guess would be to click on the dropdown, then click on "SET 1" and so on. But I couldn't make the code work to click on the dropdown.
Below is my code :
...ANSWER
Answered 2021-Dec-27 at 21:54To click() on the element with text as ALL SETS and then to click on the element with text as SET 1 instead of presence_of_element_located() you need to induce WebDriverWait for the element_to_be_clickable() and you can use the following Locator Strategies:
Code Block:
QUESTION
I'm trying to remove all instances of "universiti", "university", "university of", "college", and "college of" in my query but the "university of" and "college of" only replaces the first word and not second i.e. "of".
This is what I've tried
...ANSWER
Answered 2021-Dec-10 at 13:26You can use
QUESTION
So I'm working on a NewsApp and I could successfully manage to fetch data and display it, however the search function wasn't working! yesterday it just stuck with that error! I've every solution that I came across SOF and git but ended with failure. I provide images of every related code below. please, help
- base URL: https://newsapi.org/
- method : v2/top-headlines?
- queries : country=us&category=business&apiKey=65f7f556ec76449fa7dc7c0069f040ca
for search purpose: https://newsapi.org/v2/everything?q=tesla&apiKey=65f7f556ec76449fa7dc7c0069f040ca
dio code ...DioError [DioErrorType.other]: SocketException: Failed host lookup: 'newsapi.orgv2' (OS Error: No address associated with hostname, errno = 7)
ANSWER
Answered 2021-Nov-03 at 15:15try to put / after org in your baseUrl
QUESTION
I'm have been spending past few days in learning of python. Today I come with a topic called web scraping. I'm trying to scrape all p tag inside a div except first 3 p tag. Since there is no class or id for the p tag I can't find way to un-scrape them
My code:
...ANSWER
Answered 2021-Aug-25 at 09:13You should add the div strings to an array to store them. You should then remove the first three elements of the array. This can be done like this:
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