Java calculations for calculating the volume of a cylinder and elliptical cylinder
Here is my calculations for a circular (regular) cylinder
volume = Math.PI * Math.pow(length / 2.0, 2) * depth;
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Here are my calculations for an elliptical cylinder
volume = Math.PI * Math.pow(length * width, 2) * depth;
When I run it as a circle it comes out fine, but when I run it as an oval it returns a huge number. I'm not sure if my calculations are wrong or what.
volume = Math.PI * length * width * depth / 4; // div by 4
It's really (length/2) * (width/2), but we can simplify it to (length * width / 4)
Off the top, the volume for the oval (elliptical cylinder) is not correct dimensionally. It should be
volume = Math.PI * (length * width) / 4.0 * depth;
Mike,
Test your formula against Wolfram Alpha:
http://www.wolframalpha.com/entities/calculators/elliptic_cylinder_volume/1n/ld/39/
Remember that:
- semi-major axis is length divided by two
- semi-minor axis is width divided by two
- Length is the case of wolfram alpha, is actually what you refer to as depth
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