how to get the mathematical function sin

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  1. - 11th July 2010, 16:50 #1
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    The results are in
    Binary Radians as the manual suggest...
    Dave
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  2. - 17th July 2010, 21:20 #2
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    Default more on sin format

    Quote Originally Posted by mackrackit View Post
    The results are in
    Binary Radians as the manual suggest...
    If I'm not mistaken, the results of a sin function are merely a ratio and don't have a unit. In this case, it's -127 to 127, which is as I see it, a number to be divided by 127 to get the actual result.

    Radians are a unit like degrees, and the result wouldn't be in radians anyway, since the result is merely supposed to be a ratio.

    I could be way off base with this, and would be glad to be shown how radians are involved.

    picster
  3. - 18th July 2010, 14:13 #3
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    It is just a way to have a circle fit into a byte. Probably should have been named something different.

    http://www.oopic.com/pgchap15.htm
    Dave
    Always wear safety glasses while programming.
  4. - 18th July 2010, 16:52 #4
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    Quote Originally Posted by mackrackit View Post
    It is just a way to have a circle fit into a byte. Probably should have been named something different.

    http://www.oopic.com/pgchap15.htm
    Interesting link. Sorry, I don't mean to nit-pic, just to provide some clarification.

    From a mathematical standpoint, "Brads" as referred to in the link, is a suggested misnomer as well, since radians play no role in the user's-end of the equation. Lacking any other existing unit, some new unit should be assigned. Since the nature of any angle measurement is that it cycles, similarities in this respect are moot point (since it's a requirement). I'm kind of partial to "Bangles", myself - Binary Angles where there are 256 units in a full cycle.

    The difficulties I encountered while trying to implement SIN properly in my recent program was due to the fact that the manual provided no examples, and the wording was such that one would think that radians (by definition) were the actual unit of measurement (which they aren't, since the function doesn't repeat every 6.28 units). I hope this helps others who are trying to successfully implement this function.

    picster
  5. - 18th July 2010, 17:13 #5
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    I do not see any buttheads or nit-picers...
    I see a confusing subject being discussed.

    I agree that some if not most of the examples are lacking, that is part of the reason the wiki was started.

    Would you be game to writing an article about this for the math section?
    http://www.picbasic.co.uk/forum/content.php?r=163
    Dave
    Always wear safety glasses while programming.
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