B = gpucoder.stencilKernel(FUN,A,[M N],shape,param1,param2...)applies the functionFUNto each[M,N]sliding window of the inputA. FunctionFUNis called for each[M,N]submatrix ofAand computes an element of outputB. The index of this element corresponds to the center of the[M,N]window.

FUNis the handle to a user-defined function that returns a scalar output of the same type as the input.

C= FUN(X,param1,param2, ...)

Xis the[M,N]submatrix of the original inputA.Xcan be zero-padded when necessary, for instance at the boundaries of inputA.Xand the window can also be 1-D.

Cis a scalar valued output ofFUN. It is the output computed for the center element of the[M,N]arrayXand is assigned to the corresponding element of the output arrayB.

param1,param2are optional arguments. Pass these arguments ifFUNrequires any additional parameters in addition to the input window.

The window[M,N]must be less than or equal to the size ofA, with the same shape asA.

IfAis 1-D row vector, the window must be[1,N].

IfAis 1-D column vector, the window must be[N,1].

shapedetermines the size of the output arrayB. It can have one of three possible values:

The inputAmust be a vector or matrix with a numeric type supported byFUN. The class ofBis the same as the class ofA.

Code generation is supported only for fixed size outputs. Shape and window must be compile-time constants because they determine the size of the output.