public static void addEquals( DMatrix4 a , DMatrix4 b ) {
        a.a1 += b.a1;
        a.a2 += b.a2;
        a.a3 += b.a3;
        a.a4 += b.a4;
    }
public static void addEquals ( DMatrix4 a , DMatrix4 b ) { a . a1 += b . a1 ; a . a2 += b . a2 ; a . a3 += b . a3 ; a . a4 += b . a4 ; }
<p>Performs the following operation:<br>
<br>
a = a + b <br>
a<sub>i</sub> = a<sub>i</sub> + b<sub>i</sub> <br>
</p>

@param a A Vector. Modified.
@param b A Vector. Not modified.