TELL ME
this post was submitted on 13 Feb 2024
438 points (92.3% liked)
Lemmy Be Wholesome
6546 readers
3 users here now
Welcome to Lemmy Be Wholesome. This is the polar opposite of LemmeShitpost. Here you can post wholesome memes, palate cleanser and good vibes.
The home to heal your soul. No bleak-posting!
Rules:
1. Be Respectful
Refrain from using harmful language pertaining to a protected characteristic: e.g. race, gender, sexuality, disability or religion.
Refrain from being argumentative when responding or commenting to posts/replies. Personal attacks are not welcome here.
...
2. No Illegal Content
Content that violates the law. Any post/comment found to be in breach of common law will be removed and given to the authorities if required.
That means: -No promoting violence/threats against any individuals
-No CSA content or Revenge Porn
-No sharing private/personal information (Doxxing)
...
3. No Spam
Posting the same post, no matter the intent is against the rules.
-If you have posted content, please refrain from re-posting said content within this community.
-Do not spam posts with intent to harass, annoy, bully, advertise, scam or harm this community.
-No posting Scams/Advertisements/Phishing Links/IP Grabbers
-No Bots, Bots will be banned from the community.
...
4. No Porn/Explicit
Content
-Do not post explicit content. Lemmy.World is not the instance for NSFW content.
-Do not post Gore or Shock Content.
...
5. No Enciting Harassment,
Brigading, Doxxing or Witch Hunts
-Do not Brigade other Communities
-No calls to action against other communities/users within Lemmy or outside of Lemmy.
-No Witch Hunts against users/communities.
-No content that harasses members within or outside of the community.
...
6. No NSFW Content
-Content shouldn't be NSFW
-Refrain from posting triggering content, if the content might be triggering try putting it behind NSFW tags.
7. Content should be Wholesome, we accept cute cats, kittens, puppies, dogs and anything, everything that restores your faith in humanity!
Content that isn't wholesome will be removed.
...
8. Reposting of Reddit content is permitted, try to credit the OC.
-Please consider crediting the OC when reposting content. A name of the user or a link to the original post is sufficient.
...
Also check out:
Partnered Communities:
6.Jokes
...
Reach out to LillianVS for inclusion on the sidebar.
All communities included on the sidebar are to be made in compliance with the instance rules.
founded 1 year ago
MODERATORS
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
Ever wondered what’s the difference between NA and NULL?
Let’s say you have a string of numbers like 5, 8, NA, 3.
What’s the first number? It’s 5.
What’s the third one? It’s NA (missing).
What’s the seventeenth number? It’s NULL, meaning it doesn’t even make any sense to request a number like that when this vectors is so short.
BTW some programs/languages may treat these terms differently.
I do a lot of training for our new hire data analysts. My favorite lesson is explaining to them how this applies in the tools we use. You can get a feel for how someone's brain works by their reaction. Horror, wonder, or pop...always fun.
These things can be quite mind blowing at first. Eventually you get configurable in creating a 0x0 matrix and adding more rows to it.
But what about empty string, and what’s the difference between NULL and “NULL”? Is NaN a null number?
So there is the "it depends" answer, but generally:
NULL means a value doesn't exist in memory, usually because the variable was never given a value, or because the variable was given the null value.
"NULL" is a string with the word null written in all caps. It's not an empty string and it's not NULL. It's a value with the word "NULL".
"" is an empty string. It's not NULL because technically it's fully initialized value. It's a string that has a length of 0 characters.
NaN is not a number. A value could or could not exist, but if it's not a number then if you check for a number you could get NaN.
It depends on the context. What was described as NA in that example by be NULL or NaN in another application. For example, excel power query would call it NULL, which I find baffling having used R.
It’s basically Wild West out there. There are no rules, there is only chaos.
Excel probably thinks null is Jan-01-1900.
And empty cells are zeroes. 🤯
Interesting. I've never wondered about that though.
You don’t have to until you start wondering why a particular value in your program is NULL instead of a number. Then you realize that the program is trying to do something completely absurd like find the tenth number of a vector that has only 5 values.