算法包中 for 循环内的 if-else

Question

我正在尝试在 for 循环内使用 if-else 语句。这是我的代码，内部 for 循环和 if-else 语句存在一些问题。代码如下

\begin{algorithm}
\caption{Euclid’s algorithm}
\label{alg:euclid}
\begin{algorithmic}[1]
\State U: a set of authentic users
\State T: a set containing trustor and trustee information
    \Procedure{DepthDetection}{$T_t_h, U_i$}
    % \State $r\gets a\bmod b$
    \State $T_u_i  \gets list\ of\ trustee\ taking\ U_i\ as\ trustor$
    \State $I_u_i  \gets list\ of\ items\ rated\ by\ U_i$
    \State Build ${U_i}'s\  trust\ network\ using\ $T_t_h$

    \For{each item $i$ in $I_u_i$ }
    \State $NU_u_i  \gets list\ of\ users\ who\ rated\ I_i$
        \For{each user $u$ in $NU_u_i$ }
            \IF{$u$ is in $T_u_i$}
                \STATE use the rating and trust of $u$ for prediction of rating
            \ENDIF
        \EndFor
    \EndFor

    \State \textbf{return} $L$
    \EndProcedure
\end{algorithmic}\end{algorithm}  

我得到的输出是

如您所见，内循环之后还有 if 条件和语句的延续。我希望采用嵌套格式。

Answer 1

你正在混合algorithmic语法algpseudocode。

\documentclass{article}
\usepackage{algorithm,algpseudocode}

\begin{document}

\begin{algorithm}
\caption{Euclid’s algorithm}
\label{alg:euclid}
\begin{algorithmic}[1]
\State $U$: a set of authentic users
\State $T$: a set containing trustor and trustee information
    \Procedure{DepthDetection}{$T_{t_h}$, $U_i$}
    \State $T_{u_i} \gets$ list of trustee taking $U_i$ as trustor
    \State $I_{u_i} \gets$ list of items rated by $U_i$
    \State Build $U_i$'s trust network using $T_{t_h}$
    \For{each item $i$ in $I_{u_i}$}
    \State $NU_{u_i} \gets$ list of users who rated $I_i$
        \For{each user $u$ in $NU_{u_i}$ }
            \If{$u$ is in $T_{u_i}$}
                \State use the rating and trust of $u$ for prediction of rating
            \EndIf
        \EndFor
    \EndFor
    \State \textbf{return} $L$
    \EndProcedure
\end{algorithmic}
\end{algorithm}

\end{document}

我还修复了数学模式和双下标的误用。