函数没有产生预期的结果吗？

Question

I am having some trouble trying to figure out why one of my functions isn't producing the results I expect. I am pretty sure it has something to do with converting this equation into code but I can't pinpoint what is wrong exactly.

This is the given formula: d=radius * arccos(sin(x1)sin(x2)+cos(x1)cos(x2)cos(|y1-y2|)) http://img42.com/yfTmc+

Here is my code:

part1 = math.cos(abs(y1 - y2))
part2 = math.cos(x1) * math.cos(x2)
part3 = math.sin(x1) * math.sin(x2)
d = RADIUS * math.acos(part3 + (part2 * part1))
return d

Answer 1

You're giving your values in degrees instead of the radians that the math.sin , etc. functions expect. Try converting your values to radians with math.radians(degValue) .