fit long equation into one line

Question

I think this equation will fit into one line, but I'm running out of space in the editor. I don't want to split the equation (I don't think I will need to)

\begin{subequations}
\begin{align}
\nu_{p} 
& =\frac{\partial V_{c}}{\partial \sigma_{p}}\\
&=PN'(d1)\frac{\partial d1}{\partial \sigma}\frac{\partial \sigma}{\sigma_{p}}\\
&\ -GHN'(d2)\frac{\partial d2}{\partial \sigma}\frac{\partial \sigma}{\partial \sigma_{p}}
\end{align}
\end{subequations}

any suggestions? Thanks!

Answer 1

I'm not sure what you mean by running out of space in the editor, you can write the equation on as many lines as you want in the editor not leaving blank lines.

\begin{align}
\nu_{p} &=\frac{\partial V_{c}}{\partial \sigma_{p}} \notag\\
&=PN'(d_1)\frac{\partial d_1}{\partial\sigma}\frac{\partial\sigma}{\partial\sigma_p}-GHN'(d_2)\frac{\partial d_2}{\partial\sigma}\frac{\partial \sigma}{\partial\sigma_p}
\end{align}

Answer 2

Yes, it all fits in one line. I also suggest you simplify typing partial differentials with the \diffp command, from esdiff.

\documentclass{article}
\usepackage{mathtools, esdiff}
\usepackage{showframe}
\renewcommand\ShowFrameLinethickness{0.3pt}

\begin{document}

\begin{subequations}
  \begin{align}
    \nu_{p}
    =\diffp{V_{c}}{{\sigma_p}}
    =PN'(d1)\diffp{d1}{σ}\diffp{σ}{{\sigma_p}}
    \ -GHN'(d2)\diffp{d2}{σ}\diffp{σ}{{\sigma_p}}
  \end{align}
\end{subequations}

\end{document}