[ncl-talk] dot product question

[M P]

Hello,
I have two arrays a(:,:,:), b(:,:,:), third dimension being vertical.  I
want to obtain a dot product along  the third index i.e.
c(i,j) = sum[a(i,j,k)*b(i,j,k)]_k=bottom,top.
I tried dim_sum_n but probably incorrectly and it produces wrong results.
Can you advise?
Thanks,
Mark
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