Math symbol explanation in the same line

I would like to write the explanation of symbols on the same line of the equation.

I would like to see something like this:

This is my code:

\documentclass{article}
\usepackage[utf8]{inputenc}

\usepackage{amsmath}

\begin{document}

$$K_0 = \frac{\sum x}{n} && \text{where, x_i - raw yaw angle at idle state} \label{eq:2} \\ \text{n - total number of measurements}$$

\end{document}


I generally would not add that as a part of the equation as there is often limited space available. If you insist, you could do something like

K_0 = \frac{\sum x}{n} \qquad \text{where,}\quad \begin{alignedat}[t]{2} &x_i &&\text{ -- raw yaw angle at idle state} \\ & n &&\text{ -- total number of measurements} \end{alignedat}


I'd simply use a tabular. Two versions, one with the equation number centered as a whole, one with top alignment of the equation number.

\documentclass{article}
\usepackage{amsmath}

\begin{document}

$$\label{eq:center} \begin{gathered} K_0 = \frac{1}{n}\sum_i x_i \qquad\text{where} \begin{tabular}[t]{ll} x_i & -- raw yaw angle at idle state \\ n & -- total number of measurements \end{tabular} \end{gathered}$$

$$\label{eq:top} K_0 = \frac{1}{n}\sum_i x_i \qquad\text{where} \begin{tabular}[t]{ll} x_i & -- raw yaw angle at idle state \\ n & -- total number of measurements \end{tabular}$$

\end{document}


Meanwhile, I found another way.

\begin{align} % multi-line equation
K_0 = \frac{\sum x}{n} \label{eq:311} \quad \text{where,}
& \text{ $x_i$ - raw yaw angle at idle state}\\
& \text{$n$ - total number of measurements}\nonumber
\end{align}


• It would be great if you could add an image to show how your answer parses – mrbolichi May 7 '18 at 10:25
• @mrbolichi I have it now. – JeJo May 7 '18 at 10:46