I am quite new to LaTeX and want to typeset a optimisation problem.

I found a very neat example at https://jcnts.wordpress.com/2009/11/11/formatting-optimization-problems-with-latex/:

The only problem is it don't show a new equation number for each line. So I changed it and now get the equation numbers but there's a huge gap between min/subject to and the cost function/constraints now. Is there any possibility to combine the best of both approaches?

Code for both approaches:

```
\documentclass{report}
\usepackage{amsmath}
\usepackage{hyperref}
\newcommand{\norm}[1]{\lVert#1\rVert_2}
\begin{document}
my approach
\begin{subequations}
\begin{align}
&\underset{x}{\text{min}}
&&\norm{f(x)}^2\label{eq:optProb}\\
&\text{subject to}
&&\alpha \geq 0,\label{eq:constraint1}\\
&&&\beta \geq 0.\label{eq:constraint2}
\end{align}
\end{subequations}
%
%
approach from\\ \url{https://jcnts.wordpress.com/2009/11/11/formatting-optimization-problems-with-latex/}:
\begin{equation}
\begin{aligned}
&\underset{x}{\text{min}}&&\norm{f(x)}^2\\
&\text{subject to} &&\alpha \geq 0,\\
&&&\beta \geq 0.
\end{aligned}
\end{equation}
\end{document}
```

## Best Answer

Just change

`align`

into`alignat`

: