system.numerics

Cannot find the Vector<T>(Span<T>) constructor

由 百般思念 提交于 2021-02-10 14:35:53
问题 I'm giving a try to SIMD in c# and trying to initialize a Vector from a Span ( var myVector = new Vector<T>(myTSpan); ) as promised in: https://docs.microsoft.com/en-us/dotnet/api/system.numerics.vector-1?redirectedfrom=MSDN&view=netstandard-2.1 I'm using Visual Studio 2019, C# 7.3; targeting to .NET Framework 4.7.2. I'm using the System.Numerics 4.0.0.0, System.Numerics.Vectors 4.1.4.0 from NuGet, and System.Memory 4.0.1.0 I have also downloaded the NETStandard.Library 2.0.3 from NuGet and

3D Rotation using System.Numerics.Quaternion

由 一个人想着一个人 提交于 2021-01-29 15:40:18
问题 Anybody here know how to rotate a vector3 using .net(4.6 and up) System.Numerics.Quaternion? My maths is pretty poor though and my understanding only really goes as far as: quaternions are 4d "structures" that can produce translation, scaling and rotation in 3d. So I had a play and cannot get any rotation. Doing what seemed obvious : changing the W component of the Quaternion.(angle) then reading the vector produces scaling ?!? Anyone able to help or point me in the right direction for help?

System.Numerics.Vector<T> Initialization Performance on .NET Framework

由 不羁岁月 提交于 2020-12-13 03:16:49
问题 System.Numerics.Vector brings SIMD support to .NET Core and .NET Framework. It works on .NET Framework 4.6+ and .NET Core. // Baseline public void SimpleSumArray() { for (int i = 0; i < left.Length; i++) results[i] = left[i] + right[i]; } // Using Vector<T> for SIMD support public void SimpleSumVectors() { int ceiling = left.Length / floatSlots * floatSlots; for (int i = 0; i < ceiling; i += floatSlots) { Vector<float> v1 = new Vector<float>(left, i); Vector<float> v2 = new Vector<float>

What is the .NET System.Numerics.BigInteger Equivalent of Org.BouncyCastle.Math.BigInteger.ToByteArrayUnsigned?

由 本秂侑毒 提交于 2020-01-16 08:13:11
问题 I am currently working with the .NET port of BouncyCastle and I am having some trouble converting a big integer into a System.Guid using the native .NET BigInteger . For some context, I am using BouncyCastle in one ("source") application to convert a System.Guid to a Org.BouncyCastle.Math.BigInteger . This value is then saved as a string in the format 3A2B847A960F0E4A8D49BD62DDB6EB38 . Then, in another ("destination") application, I am taking this saved string value of a BigInteger and am

How can I count the occurrence of a byte in array using SIMD?

由 隐身守侯 提交于 2019-12-23 03:48:12
问题 Given the following input bytes: var vBytes = new Vector<byte>(new byte[] {72, 101, 55, 08, 108, 111, 55, 87, 111, 114, 108, 55, 100, 55, 55, 20}); And the given mask: var mask = new Vector<byte>(55); How can I find the count of byte 55 in the input array? I have tried xoring the vBytes with the mask : var xored = Vector.Xor(mask, vBytes); which gives: <127, 82, 0, 91, 91, 88, 0, 96, 88, 69, 91, 0, 83, 0, 0, 35> But don't know how I can get the count from that. For the sake of simplicity let

Can C# make use of fused multiply-add?

由 假如想象 提交于 2019-12-22 06:55:44
问题 Does the C# compiler / jitter make use of fused multiply-add operations if they are available on the hardware being used? If it does, are there any particular compiler settings I need to set in order to take advantage of it? My intent is to use compensated algorithms for extended precision arithmetic, and some of them can be written to use FMA. 回答1: At last, .NET Core 3.0 provides System.Math.FusedMultiplyAdd. The rationale for not using this operation automatically is explained in a github

How to add a reference to System.Numerics.dll

由 只谈情不闲聊 提交于 2019-11-27 05:14:16
I want to use the BigInteger class from the System.Numerics but if i want to write using System.Numerics; Numerics is not found. I searched the web, and I found that I have to add a reference to System.Numerics.dll , but how can I do that? http://msdn.microsoft.com/en-us/library/7314433t(v=vs.80).aspx From MSDN: In Solution Explorer, select the project. On the Project menu, choose Add Reference. The Add Reference dialog box opens. Select the tab indicating the type of component you want to reference. In the top pane, select the component you want to reference, and then click the Select button.

How to add a reference to System.Numerics.dll

由 杀马特。学长 韩版系。学妹 提交于 2019-11-26 11:28:33
问题 I want to use the BigInteger class from the System.Numerics but if i want to write using System.Numerics; Numerics is not found. I searched the web, and I found that I have to add a reference to System.Numerics.dll , but how can I do that? 回答1: http://msdn.microsoft.com/en-us/library/7314433t(v=vs.80).aspx From MSDN: In Solution Explorer, select the project. On the Project menu, choose Add Reference. The Add Reference dialog box opens. Select the tab indicating the type of component you want
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