Store this matrix into the supplied double array in column-major order.
<p>
In order to specify an explicit offset into the array, use the method {@link #get(double[], int)}.
@see #get(double[], int)
@param arr
the array to write the matrix values into
@return the passed in array
Store this matrix into the supplied double array in column-major order. <p> In order to specify an explicit offset into the array, use the method {@link #get(double[], int)}.
@see #get(double[], int)
@param arr the array to write the matrix values into @return the passed in array