The C interface for Gradient along a dimension. More...

afError	af_grad_B (bool d_dx, bool d_dy, unsigned nx, unsigned ny, const bool *d_in, unsigned batch)

afError	af_grad_U (unsigned d_dx, unsigned d_dy, unsigned nx, unsigned ny, const unsigned *d_in, unsigned batch)
	Unsigned integer gradient function. More...

afError	af_grad_I (int d_dx, int d_dy, unsigned nx, unsigned ny, const int *d_in, unsigned batch)
	Integer gradient function. More...

afError	af_grad_S (float d_dx, float d_dy, unsigned nx, unsigned ny, const float *d_in, unsigned batch)
	Single precision, floating point gradient function. More...

afError	af_grad_D (double d_dx, double d_dy, unsigned nx, unsigned ny, const double *d_in, unsigned batch)
	Double precision, floating point gradient function. More...

Detailed Description

The C interface for Gradient along a dimension.

grad computes the gradient of a matrix using a central difference along a given dimension. For an interior point in the matrix, \( n_i \), the central difference is computed as \( \frac{n_{i+1} - n_{i-1}}{2} \). For exterior points (those along the edge of the matrix), a one-sided difference is used.

array a; //a = [4  5  3]
         //    [8 10  9]
         //    [9 15 20]
array dx,dy;
grad(dcol,drow,a);
// Vertical gradient (along columns)
// dcol = [4   5   6]
//        [2.5 5 8.5]
//        [1   5  11]
// Horizontal gradient (along rows)
// drow = [1 -0.5 -2]
//        [2  0.5 -1]
//        [6  5.5  5]

Function Documentation

afError af_grad_B	(	bool *	d_dx,
		bool *	d_dy,
		unsigned	nx,
		unsigned	ny,
		const bool *	d_in,
		unsigned	batch
	)

Parameters

[out]	d_dx	Output gradient along the first dimension
[out]	d_dy	Output gradient along the second dimension
[in]	nx	Number of elements in the first dimension
[in]	ny	Number of elements in the second dimension
[in]	d_in	The input the the gradient function
[in]	batch	The number of input tiles being handledBoolean gradient function

afError af_grad_U	(	unsigned *	d_dx,
		unsigned *	d_dy,
		unsigned	nx,
		unsigned	ny,
		const unsigned *	d_in,
		unsigned	batch
	)

Unsigned integer gradient function.

afError af_grad_I	(	int *	d_dx,
		int *	d_dy,
		unsigned	nx,
		unsigned	ny,
		const int *	d_in,
		unsigned	batch
	)

Integer gradient function.

afError af_grad_S	(	float *	d_dx,
		float *	d_dy,
		unsigned	nx,
		unsigned	ny,
		const float *	d_in,
		unsigned	batch
	)

Single precision, floating point gradient function.

afError af_grad_D	(	double *	d_dx,
		double *	d_dy,
		unsigned	nx,
		unsigned	ny,
		const double *	d_in,
		unsigned	batch
	)

Double precision, floating point gradient function.