Lean | Lean Algorithmic Trading Engine by QuantConnect | Bot library

 by   QuantConnect C# Version: v2.4.0.1 License: Apache-2.0

kandi X-RAY | Lean Summary

kandi X-RAY | Lean Summary

Lean is a C# library typically used in Financial Services, Banks, Payments, Automation, Bot applications. Lean has no bugs, it has no vulnerabilities, it has a Permissive License and it has medium support. You can download it from GitHub.

Lean Algorithmic Trading Engine by QuantConnect (Python, C#)
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              Lean has a medium active ecosystem.
              It has 7540 star(s) with 2851 fork(s). There are 407 watchers for this library.
              OutlinedDot
              It had no major release in the last 12 months.
              There are 214 open issues and 2642 have been closed. On average issues are closed in 280 days. There are 4 open pull requests and 0 closed requests.
              It has a neutral sentiment in the developer community.
              The latest version of Lean is v2.4.0.1

            kandi-Quality Quality

              Lean has no bugs reported.

            kandi-Security Security

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

            kandi-License License

              Lean 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.

            kandi-Reuse Reuse

              Lean releases are available to install and integrate.
              Installation instructions are not available. Examples and code snippets are available.

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            Lean Key Features

            No Key Features are available at this moment for Lean.

            Lean Examples and Code Snippets

            No Code Snippets are available at this moment for Lean.

            Community Discussions

            QUESTION

            Should I use OpenSSL or gnutls with Apache 2.4?
            Asked 2022-Mar-22 at 03:56

            I went through a lengthy process removing mod_ssl and replaced it with gnutls because I wanted to use TLS 1.3.

            The difference I’ve noticed is gnutls doesn’t support older, legacy methods, only new ones.

            OpenSSL supports them all. Is that a better choice? I could find very little support configuring with gnutls and Apache other than the RTFM pages.

            Cons pro? Should I move back to mod_ssl? I'm leaning towards, I made a mistake with GnuTLS just for TLS 1.3 and to get a good security ranking score.

            ...

            ANSWER

            Answered 2022-Mar-22 at 03:56

            Most people use OpenSSL, and it has been updated to work with newer versions of TLS as well as older versions (backwards compatibility).

            As far as which is better, I don't know, but most use OpenSSL.

            And regarding "Server Fault" in the comment, the user could have been more informative, and likely was referring to the domain, serverfault.com, which they did not elaborate to, making it confusing.

            Source https://stackoverflow.com/questions/71552791

            QUESTION

            Override parameter pack declaration and expansion loci
            Asked 2021-Dec-16 at 18:57

            I have a simple interface setter:

            ...

            ANSWER

            Answered 2021-Dec-16 at 18:57

            You probably want something like this

            Source https://stackoverflow.com/questions/70384034

            QUESTION

            Incrementing number in an object of mongoose array
            Asked 2021-Dec-10 at 20:57

            I am trying to increment the number in MongoDB using mongoose. But I start failing right at the query stage. When I // @ts-ignore it flows silently with no error but the value doesn't update.

            The error it throws out is: Type 'number' is not assignable to type 'undefined'

            My Schema:

            ...

            ANSWER

            Answered 2021-Dec-10 at 20:05

            items is not an array, it is an object. You should access it with items.amount and NOT with items.$.amount. Change your query like this:

            Source https://stackoverflow.com/questions/70309826

            QUESTION

            Resolving a "diamond inheritance" class in lean
            Asked 2021-Dec-06 at 15:02

            I have a pretty basic construction of loops in mind for lean. I construct a class for magmata, a class for quasigroups (cancellative magmata), and a class for unital magmata. From there a loop is just something that is both a quasigroup and a unital magma.

            In Haskell this would look like

            ...

            ANSWER

            Answered 2021-Dec-06 at 15:02

            On Lean 3.35.1, you have several possible solutions. For Haskell-like record merging, there is old_structure_cmd:

            Source https://stackoverflow.com/questions/70246893

            QUESTION

            Work with large raster mosaics in R without merging them to a single file (like lidR catalog)
            Asked 2021-Nov-30 at 16:52

            The lidR package has a neat way to work with huge (pointcloud) datasets: The catalog function (doc here) avoids loading the dataset to memory and can treat mosaics [datasets that are spread across multiple (non-overlapping) tiles] as single dataset. It loads required tiles on-the-fly during computations in an intelligent way. It is great to avoid working with huge files (multiple GBs) and keep memory requirements lean if only working with small parts of the dataset.

            Is there a similar convenient/memory-efficient/"lidR-catalog-way" to process large raster mosaics in R? Or more put in a more general way: Is there a way to work with mosaic raster datasets in R without merging them first?

            I am aware of the mosaic (doc) and merge functions, which allow me to merge my tiled raster mosaic into a single raster dataset. I also found that gdal will do so a lot faster and memory efficient. Here is a R-snippet for this:

            ...

            ANSWER

            Answered 2021-Nov-30 at 16:52

            You should look into the terra package which provides exactly the functionality you're looking for through virtual raster tiles (VRTs). We can use them to treat a collection of raster files on disk as a single raster file while taking advantage of the API to do a majority of the same tasks as you can do through the raster package.

            First, let's create a sample of 4 rasters using the example straight from the ?terra::vrt() documentation.

            Source https://stackoverflow.com/questions/70172378

            QUESTION

            Should I be using functions instead of classes for pages in ReactJS?
            Asked 2021-Nov-18 at 06:02

            I've noticed React Router DOM (v6) is now using functions in their help guides in regards to pages instead of using classes.

            Previously used classes like so:

            ...

            ANSWER

            Answered 2021-Nov-18 at 06:01

            Class vs Function components is irrelevant in RRDv6, they simply render React components specified as JSX, not as a reference to a component, and not as a function returning JSX. There is also no render or component props, the Route components now use only element to render the route components.

            Source https://stackoverflow.com/questions/70015196

            QUESTION

            Certified calculations in a proof assistant
            Asked 2021-Nov-16 at 10:09

            Symbolic calculations performed manually or by a computer algebra system may be faulty or hold only subject to certain assumptions. A classical example is sqrt(x^2) == x which is not true in general but it does hold if x is real and non-negative.

            Are there examples where proof assistants/checkers such as Coq, Isabelle, HOL, Metamath, or others are used to certify correctness of symbolic calculations? In particular, I am interested in calculus and linear algebra examples such as solving definite or indefinite integrals, differential equations, and matrix equations.

            Update: To be more concrete, it would be interesting to know whether there are examples of undergraduate assignments in calculus and linear algebra that could be formally solved (possibly with the help of a proof assistant) such that the solution can be automatically verified by a proof checker. A very simple example assignment for Lean is here.

            ...

            ANSWER

            Answered 2021-Nov-15 at 17:54

            The only thing that comes to my mind is that Isabelle/HOL can replay SMT proofs (as produced e.g. by Z3 or CVC4), e.g. involving integer and real arithmetic. For computer algebra systems, I don't know of any comparable examples.

            The problem is that computer algebra systems tend not to be set up in a way where they can output a detailed certificate for their simplifications – if they were able to do that, one could attempt to replay that in a theorem prover. But it would have to go beyond purely equational reasoning, since many rules (such as your example) require proving inequalities as preconditions.

            If computer algebra systems were able to output a trace of their computations as a list of rewrite rules that were used, including how to prove each of their preconditions, one could in principle replay such a trace in a theorem prover – but that would of course require that every rule used by the CAS has a corresponding rule in the theorem prover (this is roughly how replaying SMT proofs works in Isabelle). However, I do not know of any projects like this.

            There are, on the other hand, various examples where CASs are used to compute some easily verifiable (but hard to compute) result, e.g. factoring a polynomial, isolating the roots of a real polynomial, Wilf–Zeilberger witnesses, and then verifying that this is really a valid result in a theorem prover. However, this does not involve certifying the computation process of the CAS, just the result.

            Source https://stackoverflow.com/questions/69977697

            QUESTION

            My chrome console log filter not working/buggy
            Asked 2021-Nov-09 at 15:31

            Since around 2 weeks ago, my console filter starts to filter out even matching text. Tried restarting, is currently on the latest chrome version, also tried to restore settings, nothing. Searched on the web too didn't really find anything similar... I am banging my head against the wall right now if anyone has a lead, please... (Apparently one of my coworkers also starts to have this issue recently... )

            Edit1: So played with a couple versions of chrome more. I am current on 95.0.4638.69. Tried beta version 96.x, same issue. Tried chromium 94.x, it works all fine! Haven't got a chance to try chrome 94.x as I dont' want to uninstall my chrome yet. But yeah I am leaning towards that the 95.x updates may break it, though I haven't seen any official info regarding it.

            ...

            ANSWER

            Answered 2021-Nov-09 at 15:27

            Same issue on Chrome 95.0.4638.69 (latest as of 9 Nov 2021)

            Workaround I'm using at present is to use Regular Expression format in place of standard filter string e.g. test -> /test/, then it works just the same

            Source https://stackoverflow.com/questions/69847455

            QUESTION

            How to use the summation sign in lean?
            Asked 2021-Oct-23 at 17:01

            In lean, there exists a notation for the summation sign (Σ, large Sigma) to write sums with many terms. Sadly, neither the mathlib documentation nor the reference manual seem to provide much information about how it can be used.

            What imports are required in order to use it, and how do you write sums with it?

            For example, how would you write the theorem that the first n natural numbers add up to n * (n + 1) / 2, using the summation sign?

            ...

            ANSWER

            Answered 2021-Oct-23 at 15:34

            This notation is defined in algebra.big_operators.basic. Here is a minimal working example:

            Source https://stackoverflow.com/questions/69689347

            QUESTION

            Cases tactic in Lean does not create hypothesis
            Asked 2021-Oct-22 at 20:14

            When using the cases-tactic on an inductive data type, lean produces multiple cases, but does not create a hypothesis stating the assumption of the current case. For example:

            ...

            ANSWER

            Answered 2021-Oct-22 at 20:14

            Use cases h : c to get a new hypothesis h for each case. For more detail, see the documentation.

            In the example, this would be

            Source https://stackoverflow.com/questions/69682619

            Community Discussions, Code Snippets contain sources that include Stack Exchange Network

            Vulnerabilities

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            Install Lean

            You can download it from GitHub.

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