\underset italicizes whatever in it

Question

I'm trying to write a simple argmin equation. However \underset command italicizes whatever in it. Here is my code:

\begin{align}

\label{Eq:argmin}

&{x}={\arg\underset{p}{\rm min}}\{N_{clip}(\bar{\pmb{\rm x}})\}\\

&{\rm subject~to}~ {p}~ \epsilon~\Theta \nonumber

\end{align}

and here is the output

It is strange because I used the same code many times before and it was working properly. Only in this file I have that problem... Do you have a guess about the source of that error or any solution to get rid of it?

Thank you in advance

Answer 1

Some guidelines...

• Don't wrap your math components in braces; {x} removes the appropriate spacing around x.
• Don't use {\rm ..} for roman text font. Rather use \text{..} as supplied by amsmath.
• \in denotes "member of", as opposed to \epsilon.
• If you're using proper operators, you can underset an argument using "limits".

\documentclass{article}
\usepackage{amsmath}% http://ctan.org/pkg/amsmath
\DeclareMathOperator*{\argmin}{arg\,min}
\begin{document}

\begin{align}
  \label{Eq:argmin}
  & x = \argmin_p \{N_{\text{clip}}(\bar{\mathbf{x}})\} \\
  & \text{subject to } p \in \Theta \nonumber
\end{align}

\end{document}

For better/different definitions of \argmin, see Command for argmin or argmax?

1: http://i.stack.imgur.com/W7jhG.pngSome guidelines...

• Don't wrap your math components in braces; {x} removes the appropriate spacing around x.
• Don't use {\rm ..} for roman text font. Rather use \text{..} as supplied by amsmath.
• \in denotes "member of", as opposed to \epsilon.
• If you're using proper operators, you can underset an argument using "limits".

\documentclass{article}
\usepackage{amsmath}% http://ctan.org/pkg/amsmath
\DeclareMathOperator*{\argmin}{arg\,min}
\begin{document}

\begin{align}
  \label{Eq:argmin}
  & x = \argmin_p \{N_{\text{clip}}(\bar{\mathbf{x}})\} \\
  & \text{subject to } p \in \Theta \nonumber
\end{align}

\end{document}

For better/different definitions of \argmin, see Command for argmin or argmax?