Results 1 to 6 of 6
Thread: Math.cos()
 03262011, 03:01 AM #1Member
 Join Date
 Mar 2011
 Posts
 19
 Rep Power
 0
Math.cos()
Hello, I am trying to calculate a very complex calculation that involves sines x cosines and dividing by cosines etc etc etc.
For example if I want to calculate the Math.cos(x + c+ s) where x,c and s are numbers, it gives me a wrong ans and multiply with cos(x).sin(x^2),
how do I do it?
Any help would be appreciated.
Cheers
 03262011, 03:24 AM #2Moderator
 Join Date
 Feb 2009
 Location
 New Zealand
 Posts
 4,615
 Rep Power
 12
if I want to calculate the Math.cos(x + c+ s) where x,c and s are numbers, it gives me a wrong ans
Post a SSCCE: some brief, runnable code. Say what output it produces as well as what output you were expecting. In other words elaborate on what "wrong" means in this context.
 03262011, 09:54 AM #3Member
 Join Date
 Mar 2011
 Posts
 19
 Rep Power
 0
double a= Math.cos(12.26);
double b = 19.635;
double c = Math.tan(a/b);
double d = Math.sin(c);
double e = a * (a/b);
double g= a * a* (ss * ((b)/(c*d)));
double h =a *a * (ss * ((e)/(g*a)));
This is something in similar lines.
The ans I get in java for g and h is not equal, if I calculate it using a calculator and I am getting exception on my screen while calculating, is this normal. i get exceptions like
event dispatch thread exceptions, could this be the problem
most of the exceptions show something similar to this
java.awt.EventDispatchThread.pumpEventsForFilter(E ventDispatchThread:java3)
Thanks for any help I get
 03262011, 10:20 AM #4
 Join Date
 Jan 2011
 Location
 Richmond, Virginia
 Posts
 3,069
 Blog Entries
 3
 Rep Power
 9
This isn't a short compilable bit of code, it's just some random lines. Also, you paraphrasing errors isnt helping, is there a GUI to this code? Post the exact error messages and a small program that can be compiled and run.
 03262011, 03:18 PM #5Member
 Join Date
 Apr 2009
 Posts
 49
 Rep Power
 0
hey mate,
I have to say I agree with what was posted before, what exactly are you trying to do??
Given you are using the trig functions from the Math library, I thought you should know that that the angle a taken as the single argument (angle 'a') for sin, cos, tan, etc measure in radians.
i.e. (sourced directly from Javadoc)
for Sin 
sin
public static double sin(double a)
Returns the trigonometric sine of an angle. Special cases:
If the argument is NaN or an infinity, then the result is NaN.
If the argument is zero, then the result is a zero with the same sign as the argument.
The computed result must be within 1 ulp of the exact result. Results must be semimonotonic.
Parameters:
a  an angle, in radians.
Returns:
the sine of the argument.
Javadoc for Math Library
The earlier you get used to reading the Javadoc, the less painful learning new packages will be.
I understand that being new to Java, a lot will not make sense, if you are not use to thinking in a programming framework, i.e. If you are new to the language, I can't recommend enough to hit up the likes of W3Schools Online Web Tutorials, this forum and most importantly get a book or two from the library and ploughing through them, its the best way to learn (IMO).
There is a reason why they call it a language, don't expect to be able to 'talk' to the computer in Java in a week or two, and moreover, don't think because you know two or three words that you can complete a sentence :)
 03272011, 02:52 PM #6Member
 Join Date
 Mar 2011
 Posts
 19
 Rep Power
 0
Similar Threads

Using math.round
By Hype in forum New To JavaReplies: 3Last Post: 01312011, 12:57 AM 
Create Math.sin without math.sin
By vudoo in forum New To JavaReplies: 11Last Post: 12072010, 07:23 AM 
Need help with math equation
By annabellastorm in forum New To JavaReplies: 4Last Post: 01102010, 06:12 PM 
Math.random()
By Dieter in forum New To JavaReplies: 4Last Post: 09142009, 09:28 AM 
Math Program
By stlboi in forum New To JavaReplies: 8Last Post: 04022009, 09:34 PM
Bookmarks