I am new to Matrix. Let $(\tau_{nij})_{N\times N\times J}$ $(X_{nj})_{N\times J}$, $(\gamma_{n jk})_{N\times J\times J}$, $(\pi_{i n j})_{N\times N\times J}$ and $(\alpha_{nj})_{N \times J}$, $(D_n)_N$ be matrix. How can I write the following summation in matrix form? $X_{nj}- \sum_{k=1}^J \gamma_{njk} \sum_{i=1}^N X_{ik} \frac{\pi_{i nk}}{1+\tau_{i nk}}- \alpha_{nj} \sum_{j=1}^J \sum_{i=1}^N \tau_{n ij} \frac{\pi_{n ij} }{1+\tau_{n ij}}X_{nj}=\alpha_{nj} D_n$.
where $\tau_{nij}=\tau_{inj}$ .