geom.cpp File Reference

Functions
void	IniGeom (const int myid, const int procx, const int procy, int neigh[], int &color)
void	IniCoord (const int myid, const int procx, const int procy, double &xl, double &xr, double &yb, double &yt)

---

Function Documentation

void IniCoord	(	const int	myid,
		const int	procx,
		const int	procy,
		double &	xl,
		double &	xr,
		double &	yb,
		double &	yt
	)

The quadratic domain [0,1] x [0,1] is divided into procx * procy subdomains numbered rowise. According to my process with rank number myid, the coordinates of the lower left corner (xl, yb) and of the upper right corner (xr, yt) are generated.

Parameters:

[in]	myid	my rank
[in]	procx	number of processes in x-direction
[in]	procy	number of processes in y-direction
[out]	xl	x-coordinate of left boundary
[out]	xr	x-coordinate of right boundary
[out]	yb	y-coordinate of lower boundary
[out]	yt	y-coordinate of upper boundary

void IniGeom	(	const int	myid,
		const int	procx,
		const int	procy,
		int	neigh[],
		int &	color
	)

The quadratic domain [0,1] x [0,1] is divided into procx * procy subdomains numbered rowise. According to my process with rank number myid, the vector neigh contains the ranks of the neighbours t the South, East, North, West.

Parameters:

[in]	myid	my rank
[in]	procx	number of processes in x-direction
[in]	procy	number of processes in y-direction
[out]	neigh	vector of 4 elements containing the ranks of neighbouring processes, -1 indicates a boundary in this direction
[out]	color	red/black coloring of subdomains (0/1)