Hi Jiangcheng,

the instruction of the method field_energy_in_box points out it only has
> one parameter but it requires two (another calls d) when I use the method


Thanks for pointing this out. It was an inconsistency with the scheme
interface, and is fixed in PR 239: https://github.com/stevengj/meep/pull/239

Chris

On Sun, Mar 18, 2018 at 9:44 PM, 盛建诚 <a807920...@gmail.com> wrote:

> Dear meep users,
> I just want to calculate the transmission efficiency of a waveguide and I
> don't know why there is not a attribute of direction in the attribute list
> of sources. In this case,the energy of sources spreads out and how can I
> calculate the efficiency?Additionally , the instruction of the method
> field_energy_in_box  points out it only has one parameter but it requires
> two (another calls d) when I use the method, what's the function of
> parameter d?
> wish to get your help,thanks a lot !
> Best,
> Jiangcheng
>
>
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