Is there a
\dashrightarrow
equivalent of:
\xrightarrow{\hspace*{4mm}} or \longrightarrow
or a similar way to fudge it?
[Tex/LaTex] Long Dashed Right Arrow
amsmatharrows
Related Solutions
I find the horizontal spacing of the chemarrows in mathematical formulas surprisingly bad. It may well be that the spacing is adjusted to the use in chemistry. If you want an arrow with (approximately) the same length and spacing as a \longrightarrow, then you can use this code:
\documentclass{article}
\usepackage{amsmath,xspace}
\usepackage{chemarrow}
\newcommand{\lra}{\ensuremath{\mathrel{%
\mkern1.5mu\textrm{\arro\symbol{71}}%
\mkern-1.1mu\textrm{\arro\symbol{65}}%
}}\xspace}
\begin{document}
Test \lra Result
Test $\longrightarrow$ Result
\end{document}
The xspace package is only needed for having \lra behave in the same way as $\lra$ (otherwise TeX wouldn't put a space after \lra). It is always a good idea to include an \xspace if you use \ensuremath in a macro that takes no arguments.
Basic Solution:
Now sure exactly what problem you had with using \rotatebox, but it seems to work if used as \rotatebox{-90}{$\dashrightarrow$}:
Notes:
Depending on the actual application this might need to be raised vertically, and that can be down with
\raisebox:\newcommand{\dashdownarrow}{\raisebox{2.0ex}{\rotatebox{-90}{$\dashrightarrow$}}}If it is a binary/relational operator than you can enclose the symbol in
\mathbin{}/\mathrel{}:\newcommand{\dashdownarrow}{\mathbin{\raisebox{2.0ex}{\rotatebox{-90}{$\dashrightarrow$}}}}
Use \mathchoice to auto resize:
As per Gonzalo Medina 's suggestion, to be able to use this for different math sizes such as in subscripts, you can use \mathchoice to ensure that the symbol also adjusts in size depending on the surrounding math environment:
Code:
\documentclass{article}
\usepackage{amssymb}
\usepackage{graphicx}
\newcommand\dashdownarrowi{\mathchoice%
{\rotatebox[origin=c]{-90}{$\displaystyle\dashrightarrow$}}%
{\rotatebox[origin=c]{-90}{$\displaystyle\dashrightarrow$}}%
{\rotatebox[origin=c]{-90}{$\scriptstyle\dashrightarrow$}}%
{\rotatebox[origin=c]{-90}{$\scriptscriptstyle\dashrightarrow$}}%
}
\newcommand{\dashdownarrow}{\mathrel{\dashdownarrowi}}
\begin{document}
$A\dashdownarrow B\quad M_{A\dashdownarrow B}\quad L_{M_{A\dashdownarrow B}}$
\end{document}
Use \text{} for auto resizing (and change size):
egreg had provided a simpler way to get the same effect and that is by enclosing the symbol in \text{}, allows it to re size appropriately:
Notes:
- In this version I added
\scaleboxso that you can make the symbol smaller -- adjust the scale factor to suit. - If you desire to move it vertically you can use
\raisebox{<length>}{}.
Code:
\documentclass{article}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{graphicx}
\newcommand\ddaaux{\rotatebox[origin=c]{-90}{\scalebox{0.70}{$\dashrightarrow$}}}
\newcommand\dashdownarrow{\mathrel{\text{\ddaaux}}}
\begin{document}
$A\dashdownarrow B\quad M_{A\dashdownarrow B}\quad L_{M_{A\dashdownarrow B}}$
\end{document}
Best Answer
Here is an option:
The above defines a new
\arrowfill@@style (analogous to the original\arrowfill@already defined byamsmath. The new style removes any negative\mkernbetween elements used to build the extensible arrow. Also, instead of\cleaders, it uses\xleadersto spread out the dashes as best possible (see Want to fill line with repeating string).Strange, by
amsmathdoes not define\xleftrightarrow, even though it provides a fill for the arrow throughleftrightarrowfill@...