1

I need to use the aligned environment to nicely format an equation but I am unable to set a label and a number to one of the equations. How could I achieve this?

\begin{align}
    \begin{aligned}
        &&  \text{MSD}  &= 4D \cdot t                  \nonumber \\
        &\Rightarrow    &\frac{\text{MSD}}{t}   &= 4D  \label{eq:diffusion}
    \end{aligned}
\end{align}

enter image description here

Many thanks in advance!

  • why have you got aligned there? As it is you just have a single one-line equation in the align, with no alignment points specified. – David Carlisle Dec 13 '16 at 15:59
  • @DavidCarlisle Without the aligned, I am unable to get this alignment with the \Rightarrow – Sam Dec 13 '16 at 16:01
  • but if you use aligned then you should just use equation outside not align as there is no alignment outside that block – David Carlisle Dec 13 '16 at 16:09
1

There is no need for alignat unless you need more than one point of alignment (without spaces). In your case, it suffices to use align:

enter image description here

\documentclass{article}

\usepackage{amsmath}

\begin{document}

\begin{align}
                              \text{MSD} &= 4D \cdot t    \nonumber \\
  \Rightarrow \quad \frac{\text{MSD}}{t} &= 4D \label{eq:diffusion}
\end{align}

\end{document}
  • yes I used align initially but tried to get the arrow without explicit space so switched to alignat but ended up using \quad anyway. I think I'll leave my answer in place but you should probably get the tick:-) – David Carlisle Dec 13 '16 at 17:12
0

If I understand correctly I think you want something like

enter image description here

\documentclass{article}
\usepackage{amsmath}
\begin{document}



alignat
\begin{alignat}{2}
        &&\text{MSD}  &= 4D \cdot t                  \nonumber \\
        \Rightarrow \quad &&\frac{\text{MSD}}{t}  &= 4D  \label{eq:diffusion}
\end{alignat}
\end{document}

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