math-modesymbols
I'd love to achieve a nice format for the following snippet:
$$Z_{eq}(j\omega) = R_0 + \left(R_1 + \frac{1}{j\omega C_1}\right) || \left(R_2 + \frac{1}{j\omega C_2}\right)$$
If printed as such, the || bars aren't tall enough to get a nice result.
I've also tried this solution but it doesn't work either.
$$Z_{eq}(j\omega) = R_0 + \left(R_1 + \frac{1}{j\omega C_1}\right)\parallel \left(R_2 + \frac{1}{j\omega C_2}\right)$$
Thank you!
\parallel isn't defined as a delimiter which is necessary to work with \left and \right. To achieve the desired effect try:
\[\left\lVert \frac a b\right\rVert\]
This needs amsmath, so make sure you load it.
Environment array can be used:
\documentclass{article}
\newcommand*{\threefrac}[3]{%
\begin{array}{@{\,}c@{\,}}%
#1\\
\hline
#2\\
\hline
#3%
\end{array}%
}
\begin{document}
\[
\threefrac{NI}{IN}{aI} = \threefrac{Ia}{NI}{IN}
\]
\end{document}
The lines are longer on each sides by a thin space (\,). This can be changed, if the lines should be smaller or larger.
Here a variant with uniform line spacing using \halign. The vertical space can be configured by redefining \threefracLineSep.
\documentclass{article}
\newcommand*{\threefrac}[3]{%
\ensuremath{%
\vcenter{%
\halign{\hfil$\,##\,$\hfil\cr
#1\cr
\noalign{\kern\threefracLineSep}%
\hline
\noalign{\kern\threefracLineSep}%
#2\cr
\noalign{\kern\threefracLineSep}%
\hline
\noalign{\kern\threefracLineSep}%
#3\cr
}%
}%
}%
}
\newcommand*{\threefracLineSep}{.4ex}
\begin{document}
\[
\threefrac{NI}{IN}{aI} = \threefrac{Ia}{NI}{IN}
\neq \threefrac{\sum\limits_{n=1}^\infty NI^n}{\dots}{n}
\]
\end{document}
Best Answer
As @DavidCarlisle has already noted in a comment, you may want to replace
\parallelwith\Vert. Importantly, the symbol produced by\Vertcan be enlarged vertically with the help of the\big,\Big,\bigg, and\Biggprefixes:\big\Vert,\Big\Vert,\bigg\Vert, and\Bigg\Vert. Finally, in case you need a bit of extra spacing around the double vertical lines, you could use the additional prefix elementm:\bigm\Vert,\Bigm\Vert,\biggm\Vert, and\Biggm\Vert.