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JavaScript Math trigonometrical methods return wrong results.
alert(Math.sin(Math.PI));
// sin(180) in degrees should return 0, but above code doesn'tit doesn’t return 0.
Maybe problem is with JavaScript decimal number precision. Is there any workaround to get correct results?
It’s very, very close to zero, though. (~ 10^-16)
And
alert(Math.sin(Math.PI/2))does return1.It’s just one of things you have to be careful of when dealing with floating point arithmetic. Rounding errors pop up all over the place.