gradient.cc File Reference

evaluating a specific spline, derivatives, precision More...

#include <random>
#include <iostream>
#include <vspline/vspline.h>

Go to the source code of this file.

Functions
int	main (int argc, char *argv[])

Detailed Description

evaluating a specific spline, derivatives, precision

If we create a b-spline over an array containing, at each grid point, the sum of the grid point's coordinates, each 1D row, column, etc will hold a linear gradient with first derivative == 1. If we use NATURAL BCs, evaluating the spline with real coordinates anywhere inside the defined range should produce precisely the sum of the coordinates. This is a good test for both the precision of the evaluation and it's correct functioning, particularly with higher-D arrays.

compile: clang++ -O3 -DUSE_VC -march=native -std=c++11 -pthread -o gradient gradient.cc -lVc

(with Vc; use -DUSE_HWY and -lhwy for highway, or -std=c++17 and -DUSE_STDSIMD for the std::simd backend)

or clang++ -O3 -march=native -std=c++11 -pthread -o gradient gradient.cc

Definition in file gradient.cc.

Function Documentation

main()

int main	(	int	argc,
		char *	argv[]
	)

Definition at line 57 of file gradient.cc.