Sin and cos functions wrong?

[iBeatz]

I've been doing an angle-based movement project, and haven't really done anything major with angles in GScript until now.
When I use a variable which is equal to 180 and take the sine of it using sin(), instead of echoing 0 for the sine value of 180 (which I know it should), it echoes a value of -0.801.
The same goes for the cosine value of 180. It echoes a value of -0.598 instead of -1.

Any reason for this, or is there something wrong with the functions?

[Crow]

Use radian values, not degrees. pi is a built-in variable that'll help a lot.

[Sinkler]

Originally Posted by Crow

Use radian values, not degrees. pi is a built-in variable that'll help a lot.

I know nothing about scripting, but does it have something to do with units? In calculus, we're not permitted to use degrees due to the units associated with degrees. Is this a fair assumption?

--This is coming from an unknowledgeable person in regards to scripting--

[cbk1994]

Originally Posted by Sinkler

I know nothing about scripting, but does it have something to do with units? In calculus, we're not permitted to use degrees due to the units associated with degrees. Is this a fair assumption?

You know how your calculator has a mode for radians and a mode for degrees? In programming, radians are almost always used.

I don't really know what you mean by "units associated with degrees" but that sounds like a silly reason to use radians.

[Sinkler]

Originally Posted by cbk1994

You know how your calculator has a mode for radians and a mode for degrees? In programming, radians are almost always used.

I don't really know what you mean by "units associated with degrees" but that sounds like a silly reason to use radians.

When using related rates, some problems (if you use degrees) can end up with:

"___ degrees/hour"

Which doesn't make sense (if we're talking angular calculus). That's why Radians is the preferable mode in calculus. There are no units.

[cbk1994]

Originally Posted by Sinkler

Which doesn't make sense (if we're talking angular calculus). That's why Radians is the preferable mode in calculus. There are no units.

Radians are units . You just generally don't write it because it's assumed. There's also radians per second and similar.

[fowlplay4]

There's also:

degtorad(angle);
radtodeg(angle);

To convert back and forth. You really shouldn't need to do that though.

[iBeatz]

Originally Posted by fowlplay4

There's also:

degtorad(angle);
radtodeg(angle);

To convert back and forth. You really shouldn't need to do that though.

I'm using degtorad().
I just feel more comfortable using degrees than radian values.

[fowlplay4]

Originally Posted by iBeatz

I'm using degtorad().
I just feel more comfortable using degrees than radian values.

Well yeah of course degtorad(45) is a lot easier to read/understand than say (pi / 4) for 45 degrees.

Keep in mind that pi is equal to a 180 degrees and it's easy enough to calculate degrees using it. I.e: 360 (pi * 2) or 90 (pi / 2) or 45 (pi / 4) and so on.