I have added \usepackage{ifsym} in the front, and LaTeX cannot parse the command \Letter. What should I do to fix this?
[Tex/LaTex] How to use the ifsym package
packages
Related Solutions
Your question is not very clear (it always helps if you include a document that shows the problem) but this
Is a document that increases the text width by 2cm and uses a Rain symbol.
\documentclass[a4paper]{article}
\usepackage[weather]{ifsym}
\addtolength\textwidth{2cm}
\addtolength\oddsidemargin{-1cm}
\begin{document}
It's going to \Rain\ today.
\end{document}
Package subcaption is part of package captionas you can see by invoking texdoc caption. Then you get the pdf documentation for caption and subcaption.
I do not use TeXStudio, so I can't help you with your second question. Can the manual of TeXStudio help? Or perhaps the question configure-multiline-autocompletion-in-texstudio?
Best Answer
By default the package only sets up the command
\textifsymboland a couple of font selection commonds, such as\textifsym, which will produce LCD type digits and certain chemistry related symbols. To get the Letter icon you can write\textifsymbol{0}. Of course that is not convenient. In order to use the more meaningful command names, you need to load the package with one of its options:clock- provides\showclockand different clock symbolsweather- weather symbols\Sun,\Rain,...misc- includes the\Lettericon you are afteralpine- map symbols for alpine regions e.g.\Hut,\Summit,...geometry- circles, squares, diamonds,...electronic- digital signalsSo as cgnieder says
\usepackage[misc]{ifsym}will provide the\Lettercommand.