Trigonometric Functions in Degrees
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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