SciSharp / NumSharp

High Performance Computation for N-D Tensors in .NET, similar API to NumPy.
https://github.com/SciSharp
Apache License 2.0
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How to create an NDArray from pointer and NPTypeCode? #390

Open LarryThermo opened 4 years ago

LarryThermo commented 4 years ago

First of all thanks for this project.

My code calls into lower level C++ code and I wish to represent the returned array as an NDArray in C#. I have a pointer to the data, the length of the data in bytes, as well as type code. How would I go about creating an NDArray for this case? Something like:

NDArray CreateNDArray(void* data,int dataLengthBytes,NPTypeCode typeCode) { var storage = new UnmanagedStorage( "something here" ); var nda = new NDArray(storage); return nda; }

Thanks,

Lars

Oceania2018 commented 4 years ago

@LarryThermo This snippet of code will help you.

LarryThermo commented 4 years ago

Thank you. It was helpful.

Although this works for me I was hoping to find a solution that did not involve maintaining a case statement for all possible types, and instead took in a void* pointer and an NPTypeCode.

From: Haiping [mailto:notifications@github.com] Sent: Friday, January 24, 2020 3:19 PM To: SciSharp/NumSharp NumSharp@noreply.github.com Cc: Rystrom, Larry Larry.Rystrom@thermofisher.com; Mention mention@noreply.github.com Subject: Re: [SciSharp/NumSharp] How to create an NDArray from pointer and NPTypeCode? (#390)

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@LarryThermohttps://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_LarryThermo&d=DwMCaQ&c=q6k2DsTcEGCcCb_WtVSz6hhIl8hvYssy7sH8ZwfbbKU&r=HYF8_GLywj_CyctTtBeHSUbdP3vNJRlUPrSvd7uyd9o&m=ldPFDjE4dQk0khAa1Qi3wOEZBkbjT8L6EAyK7HDruZo&s=a2DXbWNMcxPC_TztnWcAT5iT8MtgAUT-mH2lENF0pdE&e= This snippet of codehttps://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_SciSharp_SharpCV_blob_792c8744856cff69f06ddfb17c2866d4d18a05db_src_SharpCV_Core_Mat.cs-23L128&d=DwMCaQ&c=q6k2DsTcEGCcCb_WtVSz6hhIl8hvYssy7sH8ZwfbbKU&r=HYF8_GLywj_CyctTtBeHSUbdP3vNJRlUPrSvd7uyd9o&m=ldPFDjE4dQk0khAa1Qi3wOEZBkbjT8L6EAyK7HDruZo&s=1Lvm_MMqopf-gcAI9EOGnt1j6tQK0FwjqQ18wrRZVeE&e= will help you.

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