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Question by Sam_Space · Jan 08, 2020 at 03:48 PM · c#error messagemathsine-wavenan

Sin function returns NaN

I'm trying to figure out why this function is returning a NaN value for v3.y. The object of the script is to move the "centerPoint" up and down using the sin. Whenever the script runs from the beginning of the scene this code throws a NaN error. However if I enable the script after the scene is run it works without throwing an error. I'm guessing it may be because centerPoint starts at 0, but I am not sure. Seeking guidance and help!

 Vector3 v3 = centerObject.localPosition;
 v3.y = Mathf.Sin(Time.time * _frequency + phase + (centerPoint / width)) * amplitude;   
 centerObject.localPosition = v3;

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avatar image Owen-Reynolds · Jan 08, 2020 at 06:42 PM 0
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To sum up the answer below -- the problem has nothing to do with the sin function. The problem is the math before it. The input was NaN (which is a special float value meaning Not A Number) so sin gave you NaN right back.

If you redid it as val=Time.time + _frequency + phase + (centerPoint / width); then you'd see val is NaN.

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Answer by unity_ek98vnTRplGj8Q · Jan 08, 2020 at 04:01 PM

Often NaN's happen when you divide by 0. Make sure your width is set before the first time the function executes (try adding a Debug.Log(width) right before your code)

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avatar image Bunny83 · Jan 08, 2020 at 05:14 PM 0
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Dividing by zero does almost never result in NaN but in positive or negative infinity. Only 0/0 results in NaN. However you are right that this is probably the cause. Because sin(infinity) will also result in NaN.

avatar image unity_ek98vnTRplGj8Q Bunny83 · Jan 08, 2020 at 05:27 PM 0
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Good to know, thanks for the correction!

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