arrayfire | ArrayFire : a general purpose GPU library | GPU library

I have the following piece of code that needs to optimized (and be later ported to the GPU through SYCL or ArrayFire):

I'm trying to use the matching_template function from the ArrayFire library But I don't know how to find the X and Y coordinates of the best matching value. I was using the imageproc library to perform this function and there it has the find_extremes function that returns the coordinates to me. How would you do the same using ArrayFire lib?

My example using imageproc

I can already cross-compile some simple applications using x86_64-w64-mingw32-g++. However, I cannot find out how to find libraries for my project (in my case I need to use SDL2 and SDL2_image). I know how to install these libraries already (sudo apt install libsdl2-dev libsdl2-image-dev), but apt search does not show any libraries for x86_64-w640mingw32-g++.

Here are the links I've looked at:

https://arrayfire.com/cross-compile-to-windows-from-linux/

https://stackoverflow.com/questions/2033997/how-to-compile-for-windows-on-linux-with-gcc-g

Is there a way to use precompiled libraries, or do I need to add the source code in my project?

Update: I followed the instructions advised by Laurent Jospin, and can compile a "Hello World" program that works with Windows (I sent it to a friend to test). However, I cannot compile my program that uses SDL.

Terminal output:

I'm trying to learn the Arrayfire idioms by translating some vectorised numpy code.

For example, this is valid rowwise addition and multiplication in numpy,

I want to use the plotting functionality of Plots.jl with an image loaded using the load_image() function of ArrayFire.

What I have is :

I want to develop an OpenCL based application with host code in C, using Ubuntu.

But the development packages overwhelm me:

I am trying to modify a value in an existing Arrayfire Matrix with a custom value. Below is an example of changing several rows and columns to a specified value (1.0) However I am struggling no doing two things:

1. Change the dimensions of the area to be changed (3x3) -> (2x2) instead.
2. Move the area to be changed Horizontally or vertically. Any change I make seems to give an invalid index error.

When trying to retrieve data from an af::array (arrayfire) from the device via host(), my output data on the host is wrong (i.e. wrong values). For testing that, I wrote a small code sample (based on https://stackoverflow.com/a/29212923/2546099):

I would like to use the ArrayFire library to run multiple artificial neural networks on the GPU in parallel.

Since I am mainly a C# developer I tried to realize it via SiaNet. But I encountered the problem that SiaNet can only run one neural network at a time.

This is because SiaNet and the C# API of ArrayFire do not implement the batchFunc function.

I wanted to make up for this and built my own little library. There I call the batchFunc function and want to build an API which can be called from C# with PInvokes.

The problem is that I can only use af_array from C#, but the batchFunc function can only process af::array. Therefore I need to convert one into the other.

My MatrixMultiply function, to have a function that I can pass batchFunc: