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math.h

 
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rikotech8



Joined: 10 Dec 2011
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Location: Sofiq,Bulgariq

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math.h
PostPosted: Mon Feb 27, 2012 11:49 am     Reply with quote
Hello! How could I return sinus value from a given angle. I'm using 18f2520 and I wanna utilize with trigonometric functions. Some sample codes would be very useful. Excuse my bad english.
PCM programmer



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PostPosted: Mon Feb 27, 2012 1:56 pm     Reply with quote
Read the description of the sin() function in math.h. It's right there:
Code:

////////////////////////////////////////////////////////////////////////////
//   float sin(float x)
////////////////////////////////////////////////////////////////////////////
// Description : returns the sine value of the angle x, which is in radians

You give the sin() function an angle (in Radians, not degrees) and you get
back the sine value (as a floating point number).
rikotech8



Joined: 10 Dec 2011
Posts: 376
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PostPosted: Mon Feb 27, 2012 2:24 pm     Reply with quote
oh I see! My mistake was that I put angle with degree dimension. I test the formula: result = sin((3.14*angle_degree)/180) and it works. Thank you very much.
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