Utilities/
linearequation.pro
Calculate a linear equation of the type ax+by+c=0
thanks to coordinates of 2 points.
comment: we can have a table with pairs of points.
linearequation
Utilities
result = linearequation(point1, point2)
Return value
abc is a table of dimension 3, number_of_straight_line,
where for each line of the table we obtain the 3 parameters
a, b and c of the linear equation ax+by+c=0
Parameters
point1
in
required
This is the first point of(the) straight line(s) whose we want to calculate
equation(s)
point2
in
required
This is the second point of(the) straight line(s) whose we want to calculate
equation(s)
There is 2 possibilities:
1) point is a complex or a table of complex, where each element is the coordinates of the point.
2) point is a table of real of dimension 2,number_of_straight_line.
For each row of the table, we have coordinates of the point.
Examples
IDL> abc=linearequation(complex(1,2),[3,4])
IDL> print, abc[0]*1+abc[1]*2+abc[2]
0.00000
Version history
Version
$Id: linearequation.pro 231 2007-03-19 17:15:51Z pinsard $
History
Sebastien Masson (smasson@lodyc.jussieu.fr)
10 juin 2000
Produced by IDLdoc 2.0.
