2.1.18.7 ocmath_find_xy_in_circle

Description

Find how many points in the circle and their indices

Syntax

int ocmath_find_xy_in_circle( uint nPts, const double * pX, const double * pY, uint * pIndices, const double xc, const double yc, const double dRadius )

Parameters

nPts

[input]the size of pX and pY

pX

[input]pointer to array containing the x-coordinate;

pY

[input]pointer to array containing the y-coordinate;

pIndices

[output] the indexs of the points which are in the circle

xc

[input] the x-coordinate of the circle center

yc

[input] the y-coordinate of the circle center

dRadius

[input] the radius of the circle

Return

Returns number of points found.

Examples

EX1

#include <wks2mat.h>

void ocmath_find_xy_in_circle_ex1()
{
	uint nPts = 5;
	double pX[] = {-3.0, -2.0, 0.0, 1.0, 1.0};
	double pY[] = {1.0, 0.0, 1.0, 1.0, 0.0};
	uint pIndices[5];
	int nRet = ocmath_find_xy_in_circle(nPts, pX, pY, pIndices, 0.0, 0.0, 2.0);
	out_int("nRet = ", nRet);
	out_str("The point in circle are:");
	for(int ii = 0; ii < nRet; ii++)
	{
		printf("Point #%d: (%f, %f)\n",pIndices[ii], pX[pIndices[ii]], pY[pIndices[ii]]);
	}
}

Remark

Should trim Missing Value before using this function

See Also

ocmath_find_xy_in_rect

Header to Include

wks2mat.h

Reference