inpolygon (MathScript Function) (Windows, Not in Base Package)

LabVIEW 8.5 Help
August 2007

NI Part Number:
371361D-01

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Member of the geometry class.

Syntax

a = inpolygon(px, py, polyx, polyy)

[a, b] = inpolygon(px, py, polyx, polyy)

Determines whether given points in the plane are inside a specified polygon.

Name	Description
px	Specifies a vector of real numbers that represent the x-coordinates of the given points.
py	Specifies a vector of real numbers that represent the y-coordinates of the given points. length(py) must equal length(px).
polyx	Specifies a vector of real numbers that represent the x-coordinates of the given points of the polygon.
polyy	Specifies a vector of real numbers that represent the y-coordinates of the given points of the polygon. length(polyy) must equal length(polyx).

Name	Description
a	Returns a vector of logical numbers of the same size as px. If the nth point (px, py) is inside or on the edge of the polygon, the nth element of a is 1. Otherwise, the nth element of a is 0.
b	Returns a vector of logical numbers of the same size as px. If the nth point (px, py) is on the edge of the polygon, the nth element of b is 1. Otherwise, the nth element of b is 0.

Z = 0:pi / 4:2*pi;
Polyx = cos(Z);
Polyy = sin(Z);
Px = 2*rand(500, 1) - 1;
Py = 2*rand(500, 1) - 1;
A = inpolygon(Px, Py, Polyx, Polyy)