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Standard trigonometric functions with angles in degrees.
-
sinDeg( theta )
-
Sine of an angle.
- Parameters:
-
theta
(floating point): an angle, in degrees
- Return value
-
(floating point): the sine of the argument
-
cosDeg( theta )
-
Cosine of an angle.
- Parameters:
-
theta
(floating point): an angle, in degrees
- Return value
-
(floating point): the cosine of the argument
-
tanDeg( theta )
-
Tangent of an angle.
- Parameters:
-
theta
(floating point): an angle, in degrees
- Return value
-
(floating point): the tangent of the argument.
-
asinDeg( x )
-
Arc sine.
The result is in the range of -90 through 90.
- Parameters:
-
x
(floating point): the value whose arc sine is to be returned.
- Return value
-
(floating point): the arc sine of the argument in degrees
-
acosDeg( x )
-
Arc cosine.
The result is in the range of 0.0 through 180.
- Parameters:
-
x
(floating point): the value whose arc cosine is to be returned.
- Return value
-
(floating point): the arc cosine of the argument in degrees
-
atanDeg( x )
-
Arc tangent.
The result is in the range of -90 through 90.
- Parameters:
-
x
(floating point): the value whose arc tangent is to be returned.
- Return value
-
(floating point): the arc tangent of the argument in degrees
-
atan2Deg( y, x )
-
Converts rectangular coordinates (
x
,y
)
to polar (r
,theta
).
This method computes the phase
theta
by computing an arc tangent
of y/x
in the range of -180 to 180.
- Parameters:
-
y
(floating point): the ordinate coordinate
-
x
(floating point): the abscissa coordinate
- Return value
-
(floating point): the
theta
component in degrees of the point
(r
,theta
)
in polar coordinates that corresponds to the point
(x
,y
) in Cartesian coordinates.
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TOPCAT - Tool for OPerations on Catalogues And Tables
Starlink User Note253
TOPCAT web page:
http://www.starlink.ac.uk/topcat/
Author email:
m.b.taylor@bristol.ac.uk
Mailing list:
topcat-user@jiscmail.ac.uk