line-spacingtables
What is the easiest way to get one and a half line spacing in all my tables? I have the setspace package loaded, if that helps. The relevant bits of my preamble currently read:
\usepackage{setspace}
\onehalfspacing
\usepackage[font={onehalfspacing}]{caption}
This gives me one half spacing for my body text and the captions of figures/tables/etc.
(Aside: I updated/simplified significantly after the OP indicated the method he/she uses to change the default line spacing of the document as well as the packages needed to make the code compilable.)
I have several suggestions:
Since you're using the setspace package and the instruction \onehalfspacing to change the default line spacing for the document as a whole, you could insert the instruction \singlespacing after the start of the ThreePartTable environment to switch locally to single-spacing.
The contents of the longtable environment are made needlessly complicated because of all those \multicolumn{1}{l}{...} and \multicolumn{1}{c}{...} wrappers. As far as I can tell, these wrappers are not needed. (All they do is create code clutter.)
Since you're using the threeparttablex package, you could write \tnote{a} and \item[a] instead of the more-laborious \textsuperscript{a} and \item \textsuperscript{a}, etc.
Here's a simplified version of the example code you gave. I've commented out the instructions that load packages that aren't actually used in the MWE. By the way, there's no point in loading graphics and graphicx individually since the rotating package loads graphicx. Similarly, don't load color if you're also going to load xcolor.
\documentclass{report}
% packages
%\usepackage{amsmath} % Extra math definitions
%\usepackage{graphics} % PostScript figures
\usepackage{setspace} % 1.5 spacing
\usepackage{longtable,threeparttablex} % Tables spanning pages
%\usepackage{color}
%\usepackage{graphicx}
%\usepackage{rotating}
%\usepackage{array}
%\usepackage{multirow}
\usepackage{booktabs}
%\usepackage[table]{xcolor}
%\usepackage{subcaption}
%\usepackage{pdfpages}
%\usepackage[notes,backend=bibtex]{biblatex-chicago}
%\addbibresource{dissbiblio.bib}
%\addbibresource{}
\usepackage[utf8]{inputenc}
%\usepackage[full]{textcomp}
\usepackage[T1]{fontenc}
\usepackage{afterpage}
%\usepackage{float}
%\usepackage{fp}
%\usepackage{pdflscape} %To rotate pages with sideways tables or large figures.
%\usepackage{xparse}
%\usepackage{siunitx} %Lets tables align columns by decimal point.
%\usepackage{lmodern}
%\usepackage[french,english]{babel}
%\usepackage{caption}
%\usepackage{pifont}
%\usepackage{microtype}
%\usepackage{amssymb}
%\usepackage{arydshln}
%\usepackage[bottom]{footmisc} %This places footnotes at the bottom so figures will appear above footnotes.
%\usepackage[colorlinks=true,linkcolor=red,citecolor=blue,hyperfigures=true]{hyperref}
%\usepackage{cleveref}
%\newcommand{\tabitem}{~~\llap{\textbullet}~~}
%\DisableLigatures[f]{encoding=T1}
%\crefformat{footnote}{#2\footnotemark[#1]#3}
%
%%Let tables fit to width of page.
%\newcommand\totextwidth[1]{%
%\sbox{\mytabularbox}{#1}%
%\figwidthc=\wd\mytabularbox%
%\textwidthc=\textwidth%
%\FPdiv\scaleratio{\the\textwidthc}{\the\figwidthc}%
%\FPmin\scaleratio{\scaleratio}{1}%
%\scalebox{\scaleratio}{\usebox{\mytabularbox}}%
%}
\begin {document}
\onehalfspacing
\afterpage{%
\begin{ThreePartTable}
\singlespacing % switch locally to single-spacing
\setlength{\LTleft}{0pt}
\setlength{\LTright}{0pt}
\renewcommand\TPTminimum{\textwidth}
%\renewcommand{\arraystretch}{0.8} % not necessary, is it?
\begin{TableNotes}[flushleft]
\small
\item[a] \textit{Event Density} (1.5) refers to the number of notes identified in a 1.5~s window starting from the onset of cadential arrival.
\item[b] \textit{Caesura} refers to the presence of a rest across all four instrumental parts.
\item[c] \textit{Elision} refers to the superposition of a new intrathematic phrase at the moment of cadential arrival, an accompanimental overlap in the bass, or a melodic lead-in.
\item[d] \textit{Interthematic Function} refers to one of the following temporal functions to characterize the passage at the theme level following cadential arrival: Before-the-Beginning, Beginning, Middle, End, After-the-End.
\textit{Intrathematic Function} refers to either the Beginning, Middle, or End functions that characterize the passage at the phrase level following cadential arrival.
\end{TableNotes}
\setlength\tabcolsep{0.1pt} % default value: 6pt
\begin{longtable}{@{\extracolsep\fill}lccc} % make longtable span width of text block
\caption{Descriptive statistics for the 11 retrospective features.} \label{tab:ex2rhetorical}\\
\toprule
\textit{Retrospective Features}
& \textit{M} (\textit{SD})
& \textit{Range}
& \textit{Mode} (\textit{Frequency}) \\
\midrule
\textbf{Segmentational Grouping} & & & \\
\quad (1) \textit{Next Note Onset} (s) & .57 (.44) & .1--1.8 & \\
\quad (2) \textit{Next Bass Note Onset (s)} & .97 (.77) & .1--2.8 & \\
\quad (3) \textit{Next Soprano Note Onset} (s) & .99 (.66) & .1--2.6 & \\
\quad (4) \textit{Event Density}\tnote{a} & 9.98 (5.25) & 3--19 & \\
\quad (5) \textit{Caesura}\tnote{b} & & & Absent (28) \\
\quad (6) \textit{Elision}\tnote{c} & & & None (26) \\
\textbf{Temporal Function} & & & \\
\quad (7) \textit{Interthematic Function}\tnote{d} & & & End (20) \\
\quad (8) \textit{Intrathematic Function} & & & Beginning (19) \\
\quad (9) \textit{Repetition} & & & Present (25) \\
\quad (10) \textit{Stimulus Length} (s) & 15.68 (4.14) & 9.2--27.6 & \\
\quad (11) \textit{Stimulus Length from CA} (s) & 7.20 (2.15) & 3.6--14.1 & \\
\bottomrule
\insertTableNotes
\end{longtable}
\end{ThreePartTable}
}
\end{document}
What you view as 1.5-spacing of the tabular lines is the regular spacing. In fact, using \usepackage[onehalfspacing]{setspace} (or \usepackage[doublespacing]{setspace} for a better visible effect) does not affect the tabular lines. You can control their spacing by adding e.g.
\renewcommand\arraystretch{0.8}
to the preamble. The default value is 1.0, a larger value stretches the lines, a smaller one moves them closer together. However, this may lead to a poor quality of the tables from a typesetting point of view (see below); the default space has been chosen deliberately as rather large.
\documentclass[11pt,a4paper,twoside]{report}
\usepackage{caption}
\usepackage{booktabs}
\usepackage[onehalfspacing]{setspace}
\renewcommand\arraystretch{0.8}
\begin{document}
Some text Some more text which continues on the next row. More text
and more and more and more and more text.
\begin{table}[htb]
\caption{Caption to be placed here.}
\centering
\begin{tabular}{cccc}
\toprule
\textbf{A}&\textbf{B}&\textbf{C}&\textbf{D}\\
\midrule
\textbf{1}&bla&bla&blabla\\
\textbf{2}&bla&bla&bl\\
\textbf{3l}&blablaba&bla&bla\\
\textbf{4}&bla&b&la\\
\bottomrule
\end{tabular}
\end{table}
\end{document}
Best Answer
The answer depends a bit on what "onehalfspacing" entails. If it's equivalent to
\setstretch{1.5}, you should try\renewcommand\arraystretch{1.5}.If your
tabular-like envrionments are located insidetableenvironments, and if you're using the terminology of thesetspacepackage and your main font size is10pt, you should try\renewcommand\arraystretch{1.25}; for11ptand12ptmain font sizes, you should use values of1.213and1.241, respectively.In the screenshot below, the left-hand and right-hand
tabularenvironments are typeset before and after a\renewcommand\arraystretch{1.5}is executed, respectively. (The default value is1.)