Return the length of a vector, a.k.a the norm or magnitude - Java java.lang

Java examples for java.lang:Math Vector

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Description

Return the length of a vector, a.k.a the norm or magnitude

Demo Code

/**//from   ww w  .j  a  v  a 2s .c om
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import java.util.ArrayList;

public class Main{
    /**
     * Return the length of a vector, a.k.a the <i>norm</i> or <i>magnitude</i>
     */
    public static float normVec2(final float[] vec) {
        return sqrt(normSquareVec2(vec));
    }
    /**
     * Return the squared length of a vector, a.k.a the squared <i>norm</i> or squared <i>magnitude</i>
     */
    public static float normSquareVec2(final float[] vec) {
        return vec[0] * vec[0] + vec[1] * vec[1];
    }
    /**
     * Return the squared length of a vector, a.k.a the squared <i>norm</i> or squared <i>magnitude</i>
     */
    public static float normSquareVec2(final float[] vec, final int offset) {
        float v = vec[0 + offset];
        final float r = v * v;
        v = vec[1 + offset];
        return r + v * v;
    }
}

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