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====== L2IP ====== compute the L2 inner product between two fields options <code> -d --digits <int> default == 7 number of digits -n --normalize normalize by norms of each field <flowfield> (trailing arg 2) input field #1 <flowfield> (trailing arg 1) input field #2 </code> usage <code> L2IP u.ff v.ff </code> returns <latex> \text{L2IP(u,v)} = ({\bf u}, {\bf v}) = \frac{1}{L_x L_y L_z} \int_{\Omega} {\bf u} \cdot {\bf v} \,\, d{\bf x} </latex> or, if -n option is specified, %%L2IP(u,v) / (L2Norm(u) L2Norm(v))%%