iemisc: Additional Examples from GNU Octave Compatible cosd Function
In iemisc: Irucka Embry's Miscellaneous Functions

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cosd Examples (R style)

library("iemisc")

# Examples from GNU Octave cosd

cosd(c(0, 180, 360))


cosd(c(90, 270, 45))



try(cosd(pi * seq(0, 80, by = 10) / 180))
# gives error message since the computed value is in radians rather than degrees


cos(pi * seq(0, 80, by = 10) / 180)
# this is correct since `cos` expects the angle in radians

try(cosd(seq(0, 80, by = 10) * 180 / pi))
# converts angles in radians to degrees; however, it will still receive an error message with this current implementation. You can use the work-around below:

xx <- seq(0, 80, by = 10) * 180 / pi

cosd(xx)


try(cos(seq(0, 80, by = 10) * 180 / pi))
# converts angles in radians to degrees; however, this is incorrect since `cos` expects the angle in radians and not degrees


cosd(90)

cos(pi/2)

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cosd and cos Examples (GNU Octave style)

```{octave eval = FALSE}

cosd(90)

cos(pi/2)

% results

cosd(90) ans = 0

cos(pi/2) ans = 6.1232e-17

```

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Works Cited

John W. Eaton, David Bateman, Søren Hauberg, and Rik Wehbring (November 2022). GNU Octave: A high-level interactive language for numerical computations: Edition 7 for Octave version 7.3.0. https://docs.octave.org/octave.pdf. Page 553.

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