algebra | Abstract algebra for Rust | Animation library

by brendanzab Rust Version: v0.1.0 License: Apache-2.0

X-Ray Key Features Code Snippets Community Discussions(10)Vulnerabilities Install Support

kandi X-RAY | algebra Summary

algebra is a Rust library typically used in User Interface, Animation applications. algebra has no bugs, it has no vulnerabilities, it has a Permissive License and it has low support. You can download it from GitHub.

Abstract algebra organises organises a wide range of structures into a logically consistent framework. These classifications can be incredibly useful for creating composable libraries and APIs.

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Quality

Security

License

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Support

algebra has a low active ecosystem.

It has 59 star(s) with 10 fork(s). There are 12 watchers for this library.

It had no major release in the last 6 months.

There are 14 open issues and 9 have been closed. On average issues are closed in 185 days. There are no pull requests.

It has a neutral sentiment in the developer community.

The latest version of algebra is v0.1.0

Quality

algebra has no bugs reported.

Security

algebra has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

License

algebra is licensed under the Apache-2.0 License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

Reuse

algebra releases are not available. You will need to build from source code and install.

Installation instructions are not available. Examples and code snippets are available.

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algebra Key Features

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algebra Examples and Code Snippets

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Community Discussions

Trending Discussions on algebra

Python: Converting a list of strings into pandas data-frame with two columns a and b, corresponding to odd and even strings respectively

When x = 10³⁰, y = -10³⁰ and z = 1, why do (x+y)+z and x+(y+z) differ?

Haskell monadic parser with anamorphisms

what if the size of training set is not the integer multiple of batch size

Parse soapMessage XML as String and search it with XPath in Java

Most effective way to fold polynomial parse tree

How to implement Exp in Bool or Iff from the paper Extensibility for the Masses

C# Get YouTube videoId from Json

Why is hash index slower using "Less than" in SQL

Using Breeze Libraries or Apache Commons with Scala Native

QUESTION

Python: Converting a list of strings into pandas data-frame with two columns a and b, corresponding to odd and even strings respectively

Asked 2021-Jun-15 at 12:32

I have this kind of input as below. It is a list of strings, every odd string is a number starting with MR and every even string is some mixed text. I need to convert this list of strings to a pandas data-frame which strictly has two columns, but because some of the MR numbers are present several times paired with different mixed text counter parts I am getting extra columns everywhere where an MR is repeated, as I am demonstrating below:

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ANSWER

Answered 2021-Jun-15 at 11:48

Try this

Source https://stackoverflow.com/questions/67985204

QUESTION

When x = 10³⁰, y = -10³⁰ and z = 1, why do (x+y)+z and x+(y+z) differ?

Asked 2021-Jun-11 at 11:28

What Every Computer Scientist Should Know About Floating-Point Arithmetic makes the following claim:

Due to roundoff errors, the associative laws of algebra do not necessarily hold for floating-point numbers. For example, the expression (x+y)+z has a totally different answer than x+(y+z) when x = 10³⁰, y = -10³⁰ and z = 1 (it is 1 in the former case, 0 in the latter).

How does one reach the conclusion in their example? That is, that (x+y)+z=1 and x+(y+z)=0?

I am aware of the associative laws of algebra, but I do not see the issue in this case. To my mind, both x and y will overflow and therefore both have an integer value that is incorrect but nonetheless in range. As x and y will then be integers, they should add as if associativity applies.

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ANSWER

Answered 2021-Jan-14 at 22:56

Round off error, and other aspects of floating point arithmetic, apply to floating point arithmetic as a whole. While some of the values that a floating point variable can store are integers (in the sense that they are whole numbers), they are not integer-typed. A floating point variable cannot store arbitrarily large integers, any more than an integer variable can. And while wraparound integer arithmetic will make (a+b)-a=b for any unsigned integer-typed a and b, the same is not true for floating point arithmetic. The overflow rules are different.

Source https://stackoverflow.com/questions/65727965

QUESTION

Haskell monadic parser with anamorphisms

Asked 2021-Jun-11 at 01:28

My problem is how to combine the recursive, F-algebra-style recursive type definitions, with monadic/applicative-style parsers, in way that would scale to a realistic programming language.

I have just started with the Expr definition below:

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ANSWER

Answered 2021-Jun-10 at 17:15

If you need a monadic parser, you need a monad in your unfold:

Source https://stackoverflow.com/questions/67924053

QUESTION

what if the size of training set is not the integer multiple of batch size

Asked 2021-Jun-09 at 05:18

I am running the following code against the dataset of PV_Elec_Gas3.csv, the network architecture is designed as follows

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ANSWER

Answered 2021-Jun-09 at 05:18

NO!!!!

In your forward method you x.view(-1) before passing it to a nn.Linear layer. This "flattens" not only the spatial dimensions on x, but also the batch dimension! You basically mix together all samples in the batch, making your model dependant on the batch size and in general making the predictions depend on the batch as a whole rather than on the individual data points.

Instead, you should:

Source https://stackoverflow.com/questions/67896539

QUESTION

Parse soapMessage XML as String and search it with XPath in Java

Asked 2021-Jun-07 at 20:10

I have a problem which I cannot solve. I have SOAP response which I get from the web service, then I parse it to String and then pass it to method in which I want to find car by id. I constantly get NPE if I use Node or 0 list length if I use NodeList. As a test, I want to get the first car.

SoapResponse:

...

ANSWER

Answered 2021-Jun-07 at 20:10

Since you are already using SAAJ for your call, why not use the same API to read the response?

Source https://stackoverflow.com/questions/67850141

QUESTION

Most effective way to fold polynomial parse tree

Asked 2021-Jun-07 at 19:34

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:

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ANSWER

Answered 2021-May-03 at 15:35

"Fold" has two related but distinct meanings in common parlance.

Fold as in Foldable. 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 which lens's Fold uses the term.) Not every datatype is Foldable — 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.

Source https://stackoverflow.com/questions/67368081

QUESTION

How to implement Exp in Bool or Iff from the paper Extensibility for the Masses

Asked 2021-Jun-05 at 10:08

I'm currently going through the paper Extensibility for the Masses. Practical Extensibility with Object Algebras by Bruno C. d. S. Oliveira and William R. Cook (available many places on the internet - for example here: https://www.cs.utexas.edu/~wcook/Drafts/2012/ecoop2012.pdf).

On page 10, they write:

Adding new data variants is easy. The first step is to create new classes Bool and Iff in the usual object-oriented style (like Lit and Add):
...

ANSWER

Answered 2021-Jun-05 at 10:08

@Mark. Let me try to clarify the confusion points that you have.

Definition of Exp

The definition of Exp that we are assumming in page 10 is:

Source https://stackoverflow.com/questions/67818254

QUESTION

C# Get YouTube videoId from Json

Asked 2021-Jun-05 at 08:05

I need help. I'm making a program using the youtube library, for c#.

For songs it works perfect. The problem is in the playlist I want to recover "videoId" to add it to a database, to put the videos in "queue".

I am using this method:

...

ANSWER

Answered 2021-Jun-05 at 06:08

Instead of going to every path you can use below code :

Source https://stackoverflow.com/questions/67846628

QUESTION

Why is hash index slower using "Less than" in SQL

Asked 2021-Jun-03 at 22:23

I've finished my first semester in a college-level SQL course where we used "SQL queries for Mere Mortals" 3rd edition.

Long term I want to work in data governance or as a data scientist, so digging deeper is needed and I found the Stanford SQL course. Today taking the first mini quiz, I got the answers right but on these two I'm not understanding WHY I got the answers right.

My 'SQL for Mere Mortals' book doesn't even cover hash or tree-based indexes so I've been searching online for them.

I mostly guessed based on what she said but it feels more like luck than "I solidly understand why". So I've ordered "Introduction to Algorithms" 3rd edition by Thomas Cormen and it arrived last week but it will take me a while to read through all 1,229 pages.

Found that book in this other stackoverflow link =>https://stackoverflow.com/questions/66515417/why-is-hash-function-fast

Stanford Course => https://www.edx.org/course/databases-5-sql

I thought a hash index on College.enrollment would not speed up because they limit it to less than a number vs an actual number ?? I'm guessing per this link Better to use "less than equal" or "in" in sql query that the query would be faster if we used "<=" rather than "<" ?

This one was just a process of elimination as it mentions the first item after the WHERE clause, but then was confusing as it mentions the last part of Apply.cName = College.cName.

My questions:

I'm guessing that similar to algebra having numerators and denominators, quotients, and many other terms that specifically describe part of an equation using technical terms. How would you use technical terms to describe why these answers are correct.
On the second question, why is the first part of the second line referenced and the last part of the same line referenced as the answers. Why didn't they pick the first part of each of the last part of each?

For context, most of my SQL queries are written for PostgreSQL now within PyCharm on python but I do a lot of practice using the PgAgmin4 or MySqlWorkbench desktop platforms.

I welcome any recommendations you have on paper books or pdf's that have step-by-step tutorials as many, many websites have holes or reference technical details that are confusing.

Thanks

...

ANSWER

Answered 2021-Jun-03 at 22:22

1. A hash index is only useful for equality matches, whereas a tree index can be used for inequality (< or >= etc).

With this in mind, College.enrollment < 5000 cannot use a hash index, as it is an inequality. All other options are exact equality matches.

This is why most RDBMSs only let you create tree-based indexes.

2. This one is pretty much up in the air.

"the first item after the WHERE clause" is not relevant. Most RDBMSs will reorder the joins and filters as they see fit in order to match indexes and table statistics.

I note that the query as given is poorly written. It should use proper JOIN syntax, which is much clearer, and has been in use for 30 years already.

Source https://stackoverflow.com/questions/67829047

QUESTION

Using Breeze Libraries or Apache Commons with Scala Native

Asked 2021-Jun-03 at 21:23

I am trying to use Scala native while performing few linear algebra computations (using Scala version 2.13.4 and Native version 0.4.0). When I try apache commons or Breeze library for linear algebra computations, I get the linking error as below, while running "sbt run".

[error] Found 1 missing definitions while linking [error] Not found Top(org.apache.commons.math3.linear.MatrixUtils$).

Error using Breeze Scala library: Found 3 missing definitions while linking Not found Top(breeze.linalg.DenseMatrix$)

Any help is appreaciated.

...

ANSWER

Answered 2021-Jun-03 at 21:23

Apache Commons is a Java library. I don't think there's a way to use it with Scala native. You'll have to find a native libary. Maybe this one? https://github.com/ekrich/sblas

Source https://stackoverflow.com/questions/67816163

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Vulnerabilities

No vulnerabilities reported

Install algebra

You can download it from GitHub.
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