sind,cosd,tand, etc. | R Documentation |
Trigonometric functions expecting input in degrees, not radians.
sind(x)
cosd(x)
tand(x)
cotd(x)
asind(x)
acosd(x)
atand(x)
acotd(x)
secd(x)
cscd(x)
asecd(x)
acscd(x)
atan2d(x1, x2)
x , x1 , x2 |
numeric or complex scalars or vectors |
The usual trigonometric functions with input values as scalar or vector
in degrees. Note that tan(x)
with fractional part does not return
NaN
as tanpi(x)
, but is computed as sind(x)/cosd(x)
.
For atan2d
the inputs x1,x2
can be both degrees or radians,
but don't mix! The result is in degrees, of course.
Returns a scalar or vector of numeric values.
These function names are available in Matlab, that is the reason they have been added to the ‘pracma’ package.
Other trigonometric functions in R.
# sind(x) and cosd(x) are accurate for x which are multiples
# of 90 and 180 degrees, while tand(x) is problematic.
x <- seq(0, 720, by = 90)
sind(x) # 0 1 0 -1 0 1 0 -1 0
cosd(x) # 1 0 -1 0 1 0 -1 0 1
tand(x) # 0 Inf 0 -Inf 0 Inf 0 -Inf 0
cotd(x) # Inf 0 -Inf 0 Inf 0 -Inf 0 Inf
x <- seq(5, 85, by = 20)
asind(sind(x)) # 5 25 45 65 85
asecd(sec(x))
tand(x) # 0.08748866 0.46630766 1.00000000 ...
atan2d(1, 1) # 45
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