如何将这个数学公式写入乳胶

Question

我想将此公式更改为Latex代码：

MathType生成的乳胶代码如下：

\[\widetilde v(i) = \frac{{\sum\nolimits_{j \in {N_i}(D)} {w(i,j)v(j)} }}{{\sum\nolimits_{j \in {N_i}(D)} {w(i,j)} }}\]

但是当我将此代码插入vim-latex时，会发生一些错误，因此vim-latex无法接受它：

mypaper.tex|559 error| LaTeX Error: Bad math environment delimiter.
mypaper.tex|559 error| Missing delimiter (. inserted). \endgroup  \[\widetilde v(i) = \frac\left\{ \sum\nolimits_{j \in {N_i}(D)} {w(i,j...
mypaper.tex|559 error| Missing \right. inserted. \right . \[\widetilde v(i) = \frac\left\{ \sum\nolimits_{j \in {N_i}(D)} {w(i,j...
mypaper.tex|559 error| Extra }, or forgotten $. ...\nolimits_{j \in {N_i}(D)} {w(i,j)v(j)} } }\left\{ \sum\nolimits_{j ...
mypaper.tex|559 error| Extra }, or forgotten $. ...nolimits_{j \in {N_i}(D)} {w(i,j)v(j)} }} \left\{ \sum\nolimits_{j \...
mypaper.tex|559 error| Extra }, or forgotten \right. ...\sum\nolimits_{j \in {N_i}(D)} {w(i,j)} } }\] \right\}<++> \right\}<++>
mypaper.tex|559 error| Extra }, or forgotten \right. ...sum\nolimits_{j \in {N_i}(D)} {w(i,j)} }} \] \right\}<++> \right\}<++>
mypaper.tex|559 error| LaTeX Error: Bad math environment delimiter.
mypaper.tex|559 error| Extra \right. ...}(D)} {w(i,j)} }}\] \right\}<++> \right\} <++>

如何解决这个问题？

Answer 1

用$$符号围绕您的数学代码。

例如：

$$ sin^2(\theta) +cos^2(\theta) = 1 $$

将产生您想要的等式。

Answer 2

我使用以下代码来解决此问题：

\widetilde v(i) = \frac{ \sum\nolimits_{j \in {N_i}(D)} {w(i,j)v(j)} }{ \sum\nolimits_{j \in {N_i}(D)} {w(i,j)}}

Answer 3

   \begin{document}

   \begin{equation}
   \tilde{v}(\it {i})=\frac{\Sigma_{j\epsilon N_iD}    
    W(\it{i,j})v(\it{j})}{{\Sigma_{j\epsilon N_iD} W(\it{i,j})}}
    \end{equation}
     \end{document}

这似乎可行。