NOTE: Due to the limitations of the wiki markup language, the r command on this page does not appear as it would on the calculator. See Wiki Markup Limitations for more information.
The r symbol used after an angle makes sure the angle is interpreted as being in radians. If the calculator is already in radian mode, xr is equal to x; in degree mode, xr is equal to 180*x/π; and in gradian mode, xr is equal to 200*x/π.
If you're using radian angle measures extensively in a program, it's a better idea to use setMode() to switch to radian mode and not worry about this. However, there are two reasons you might want to use r:
- If you need an angle in radians only once or twice, don't bother changing the mode setting.
- In a function, you're forced to use r, since setMode() isn't valid in a function.
Make sure to use parentheses around an expression like (π/3)r, since π/3r will be interpreted as π/(3r), and the conversion will be done incorrectly.
In radian mode (no conversion is necessary, so no conversion is done):
:sin(π/6) 1/2 :sin((π/6)^r) 1/2 :π^r π
In degree mode:
:sin(π/6) sin(π/6) :sin((π/6)^r) 1/2 :π^r 180