代码：
\documentclass{article}
\usepackage{algorithm}
\usepackage{algorithmic}
\begin{document}
\begin{algorithm}[t]
\caption{Dolphinn: Preprocessing (data structure)}
\label{DolphinnPrep}
\begin{algorithmic}
\INPUT{Metric $(\MM, d_{\MM})$, radius $r>0$, approximation factor $c>1$, LSH family $F=F(c,r)$, data set $P \subset \MM$, parameter $d'$.}
\STATE Initialize empty hashtable $T$.
\FOR{$i = 1$ to $d'$}
\STATE Sample $h_i \in F$ u.a.r.
\FOR{each $x \in h_i(P)$}
\STATE{Flip a fair coin and assign the result to $f_i(x)$.}
\ENDFOR
\ENDFOR
\STATE{For all $p \in P$, $f(p)=(f_1(h_1(p)), \ldots, f_{d'}(h_{d'}(p)))$.}
\STATE{For all $p \in P$, add $p$ to the bucket of $T$ with key $f(p)$.}
\end{algorithmic}
\end{algorithm}
\end{document}
错误：
./sample.tex:11: Undefined control sequence.
<recently read> \INPUT
l.11 \INPUT
{Metric $(\MM, d_{\MM})$, radius $r>0$, approximation factor ...
?
如何解决这个问题？
答案1
你可能想要\INPUTS：
\documentclass{article}
\usepackage{algorithm}
\usepackage{algorithmic}
\newcommand{\MM}{MM}% ???
\begin{document}
\begin{algorithm}[t]
\caption{Dolphinn: Preprocessing (data structure)}
\label{DolphinnPrep}
\begin{algorithmic}
\INPUTS
\STATE Metric $(\MM, d_{\MM})$, radius $r>0$, approximation factor $c>1$,
LSH family $F=F(c,r)$, data set $P \subset \MM$, parameter $d'$.
\ENDINPUTS
\STATE Initialize empty hashtable $T$.
\FOR{$i = 1$ to $d'$}
\STATE Sample $h_i \in F$ u.a.r.
\FOR{each $x \in h_i(P)$}
\STATE Flip a fair coin and assign the result to $f_i(x)$.
\ENDFOR
\ENDFOR
\STATE For all $p \in P$, $f(p)=(f_1(h_1(p)), \ldots, f_{d'}(h_{d'}(p)))$.
\STATE For all $p \in P$, add $p$ to the bucket of $T$ with key $f(p)$.
\end{algorithmic}
\end{algorithm}
\end{document}
