xyzw | Vector Matrix Quaternion Euler Angles SLERPs | Math library
kandi X-RAY | xyzw Summary
kandi X-RAY | xyzw Summary
A generic, fast, comprehensive and dependencyless vector algebra library. All included classes are available at xyzw/source. Es5 versions are available at xyzw/es5.
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QUESTION
I have:
df1
...ANSWER
Answered 2022-Apr-15 at 00:31lst=df1.select("multiplier").rdd.flatMap(lambda x: x).collect()#put multiplier into a list
df3 =(
df2.withColumn('a1', array('var1', 'var2', 'var3'))#Create an array from df2
.withColumn('a2', array([F.lit(x) for x in lst]))#Insert array from df1
.withColumn('a1',expr("transform(a1, (x,i)->a2[i]*x)"))#Compute dot product
.select('varA','varB','varC','a1', *[F.col('a1')[i].alias(f'var{str(i+1)}') for i in range(3)])#Expand a1 back to original var columns
.select('*', expr("aggregate(a1,cast(0 as bigint), (x,i) -> x+i)").alias('sumproduct'))#sumproduct
.drop('a1','a2')
)
QUESTION
I'm working with an elastic API on a url like https://something.xyzw.eg/api/search/advance (not the real url). The API works fine on postman. Also the python code generated by postman works fine and returns results. However when using leasticsearch-dsl package I keep getting:
Failed to establish a new connection: [Errno -2] Name or service not known)
Here is my code similar to the first example on documents:
...ANSWER
Answered 2022-Jan-29 at 09:46Can you try to add port=443
as in one of the examples from the doc you mentioned https://elasticsearch-py.readthedocs.io/en/v7.16.3/#tls-ssl-and-authentication ?
QUESTION
I am writing an ASP.NET Core 5 Web API (platform independent) to change the LDAP user password. I'm using the library Novell.Directory.Ldap
.
This is my code:
...ANSWER
Answered 2021-Dec-14 at 23:09While AD has a userPassword
attribute, it's just a pointer to the unicodePwd
attribute, which is the real password attribute. But userPassword
doesn't always work, as described in the documentation. For Active Directory, you're better off using unicodePwd
directly.
The documentation for unicodePwd
says that you require either SSL or SASL encryption to set the attribute. SASL would usually be done with Kerberos. If you were using DirectoryEntry
, that's easily done by specifying AuthenticationTypes.Sealing
. With Novell.Directory.Ldap
, I don't know if that's possible, and this open issue suggests that it isn't (yet).
Unless you're willing to switch to using Sytem.DirectoryServices
(which, in .NET Core, would lock you into running your app on Windows only), then I think you are stuck requiring SSL.
The unicodePwd
attribute also requires a very specific format. The documentation says:
the DC requires that the password value be specified in a UTF-16 encoded Unicode string containing the password surrounded by quotation marks, which has been BER-encoded as an octet string per the Object(Replica-Link) syntax.
In C#, that's easily done like this:
QUESTION
I'm trying to build the following structure recursively using Prolog
...ANSWER
Answered 2021-Dec-01 at 20:17You can use the accumulator Prolog programming pattern
to solve the problem. I am now assuming that you have the
input xyzw
in the form of a list [x,y,z,w]
. The accumulator
is the second argument of the predicate links/3
:
QUESTION
I'm testing a small code fragment and I'm surprised the same representation of 4 bytes as put into std::array and std::tuple yield different in-memory layouts
...ANSWER
Answered 2021-Oct-29 at 10:32std::array
has a layout specified by the standard, but std::tuple
does not, and can be anything the implementation wants.
So it's expected that they may differ, but of course they may also happen to choose the same layout, on some compilers/versions/platforms - there's just no guarantee.
In practice one of the easiest ways to implement std::tuple
is recursively, as it was originally done in the Loki library. This will lay the fields out in reverse order (the most-base class, whose subobject comes first, is the leaf for the last member of the typelist). That's not the only possible implementation though, and I have observed the field order differing between compilers/standard library implementations.
NB. as mentioned in a comment, your current diagnostic has UB - however, you can hexdump the 4 bytes at reinterpret_cast(&i.z)
safely and get an equivalent result.
QUESTION
t=m+n
x=torch.einsum('xyzw,xyzw->xyzw',m,n)
...ANSWER
Answered 2021-Oct-08 at 18:27einsum
is actually a product of its inputs. It's only a sum over the indexes that do not occur in the output.
So,
QUESTION
My question relates to the minting process to create an NTF.
I might be wrong but the tokenization function can be compared to an hashing function which takes as input the media and outputs the token.
Yeah this actually already is a question, cause otherwise the main question maybe does not makes sense.
Assuming the comparison to an hash function makes sense and forgetting about collisions let's assume the following scenario: I create a digital artwork and the related NFT. It's published and sells somehow (hopefully :D).
Imagine Mr.XYZW is a well known digital artist who gets huge revenues from NFT, he sees my artwork, somehow he likes it but also thinks the artwork would look better if for example the colors simply get inverted. Here I'm just mentioning one of all the possible changes he could do, the point is that easily those changes could not even be noticeable to the human eye, but not to the tokenizer, which would in the end clearly create a different token.
Now the problem should be clear.
If what I said makes sense, how is it usually tackled? in case it doesn’t, please help me to understand.
Thank you
...ANSWER
Answered 2021-May-29 at 15:06tokenization function can be compared to an hashing function which takes as input the media and outputs the token
This is an incorrect assumption.
You can compare an NFT collection (at least per the most widely used standard - ERC-721) to a key-value dictionary, where the key is an integer ID, and the value is a URL. The standard defines that the URL should lead to a JSON containing the token name, description, and image URL.
But there's no hashing function that would calculate the token parameters based on the image.
Each collection (holding several NFTs) is a smart contract deployed on a different address (e.g. 0x12345
). Also, each NFT within its collection has a unique ID (e.g. 1
).
Combination of the collection address and the token ID can be used as a unique identificator of each NFT (e.g. 0x12345 / 1
).
It's technically possible for multiple different NFTs (no matter whether they're in the same or different collections) to lead to very similar images or even the same image. But the combination of collection address and token ID is always unique.
QUESTION
I would like to reset/remove offset quaternion data from real-time IMU sensor recordings. E.g. I get [-0.754, -0.0256, 0.0321, 0.324]
(XYZW) when I start recordings. I would like to reset this to be [0, 0, 0, 1] when I start recording, as I am using it to rotate a 3D object which initial quaternion values are [X: 0, Y: 0, Z: 0, W: 1].
I tried subtracting all quaternion data from the first as so:
...ANSWER
Answered 2020-Dec-17 at 09:30Nice description of usage of equation rotation about axis set as quaterion can be found here:
http://wiki.alioth.net/index.php/Quaternion
quote
QUESTION
I am having trouble fully understanding why the output of the following code snippet on both onlinegdb.com and visual studio is 2
when I expected a junk/crashed value
I know what little endian and big endian are. My comp clearly should be little endian since it is a 32 bit intel core duo.
I have 512 which in little endian is:
...ANSWER
Answered 2020-Sep-01 at 20:44You may want to make a copy of the byte before printing it:
QUESTION
Im trying to self join,merge parent field and get results as separate documents data:
...ANSWER
Answered 2020-Aug-18 at 08:37here you can find examples on how to join collections (and self joins further down the page).
In your particular case the query could look something like this:
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