Utilities/
lineintersection.pro
Calculate coordinates of the intersection between 2 straight lines
or of a succession of 2 straight lines.
lineintersection
Utilities
result = lineintersection(abc1, abc2, FLOAT=FLOAT)
Return value
2 possibilities:
1) by default: it is a vector of complex whose each element is the coordinates
of the intersection point of a pair of straight lines.
2) if FLOAT is activated, it is a array of reals of dimension 2,
number_of_pairs_of_straight_lines whose each row is the coordinates
of the intersection point of a pair of straight line.
Parameters
abc1
in
required
type: 3d array
is the first array of dimension 3, number_of_pairs_of_straight_lines,
whose each line contain the 3 parameters a, b and c of the first linear
equation of the type ax+by+c=0
abc2
in
required
type: 3d array
is second array of dimension 3, number_of_pairs_of_straight_lines,
whose each line contain the 3 parameters a, b and c of the second linear
equation of the type ax+by+c=0
Keywords
FLOAT
To return the output as a array of real numbers instead of vectors of
complex (by default)
Examples
IDL> abc1=linearequation(complex(1,2),[3,4])
IDL> abc2=linearequation(complex(1,2),[8,15])
IDL> print, lineintersection(abc1, abc2)
( 1.00000, 2.00000)
IDL> print, lineintersection(abc1, abc2,/float)
1.00000 2.00000
Version history
Version
$Id: lineintersection.pro 327 2007-12-13 16:22:35Z pinsard $
History
Sebastien Masson (smasson@lodyc.jussieu.fr)
10 juin 2000
Known issues
Restrictions
If the 2 straight lines are parallel, we return coordinates
(!values.f_nan,!values.f_nan)
Beware of the precision of the machine which make
that calculated coordinates may not exactly verify
equations of the pair of straight lines.
Produced by IDLdoc 2.0.
