Forcing caption to single line

Question

I am new to LaTex and I am writing my thesis. I am currently experiencing an issue with a table in landscape mode. I would like my caption to be on a single line. I guess I have to use the captionsetup but I can't solve it. Thanks for any help.

Here is the code for the table (with less lines than the one in figure and with \pm substituted by +).

\documentclass[12pt,twoside]{report}
\usepackage[utf8]{inputenc}
\usepackage{lscape}
\usepackage[width=0.9\textwidth,labelfont=bf]{caption}
\usepackage{array} \usepackage{tabularx}

\begin{document}

\begin{landscape}
    \begin{table}[h!]
        \centering
        \caption{Elemental composition (in wt.$\%$) of the nine alloys investigated in this work}
        \renewcommand{\arraystretch}{2}
        \begin{tabularx}{0.9\hsize}[h!]{ 
           >{\raggedright\arraybackslash}p{3.9cm} 
           >{\centering\arraybackslash}X
           >{\centering\arraybackslash}X
           >{\centering\arraybackslash}X
           >{\centering\arraybackslash}X
           >{\centering\arraybackslash}X
           >{\raggedright\arraybackslash}X } 
        \hline
            & \multicolumn{6}{c}{Results (wt.$\%$)} \\
            Alloy name & Ti & Nb & Ga & Cu & O & N \\
            (Ti-45Nb)-2Ga & 53.61 + 0.72 & 43.86 + 0.73 & 1.99 + 0.07 & & 0.099 + 0.010 & 0.002 + 0.000\\
            (Ti-45Nb)-4Ga & 52.58 + 0.35 & 42.77 + 0.24 & 3.87 + 0.05 & & 0.111 + 0.008 & 0.004 + 0.001 \\
            (Ti-45Nb)-6Ga & 51.51 + 0.36 & 41.97 + 0.33 & 5.83 + 0.05 & & 0.091 + 0.015 & 0.003 + 0.001 \\
            (Ti-45Nb)-8Ga & 50.23 + 0.59 & 41.03 + 0.31 & 7.89 + 0.12 & & 0.088 + 0.004 & 0.001 + 0.000 \\
\hline
        \end{tabularx}
        \label{tab:Elemental composition of the nine alloys}
    \end{table}
\end{landscape}

\end{document}

and here is how it appears:

In order for others to test your code, please provide a full but minimal example instead of just a sniplet like this ,which we cannot test without adding stuff to it. — daleif, Dec 20, 2021 at 9:57
Hello, what do you mean exactly? Something like "usepackage" etc? — Ludovico, Dec 20, 2021 at 9:58
@Ludovico Welcome to TEX.SE. A minimal working example (MWE) is a compilable code that produces the (problematic) output that you are currently getting and starts with \documentclass... and ends with \end{document}. See the link for more details. — Imran, Dec 20, 2021 at 10:05
Probably you want width=0.9\linewidth not width=0.9\textwidth as \textwidth is the original portrait textwidth inside landscape — David Carlisle, Dec 20, 2021 at 10:07
Your code isn't compilable since \pm can't be used outside of math mode. — leandriis, Dec 20, 2021 at 10:13

David Carlisle · Accepted Answer · 2021-12-20 11:21:58Z

\textwidth inside landscape is the original (narrow) portrait text width. You can specify a wider length that fits your text eg \columnwidth

\documentclass[12pt,twoside]{report}
\usepackage[utf8]{inputenc}
\usepackage{lscape}
\usepackage[width=0.9\textwidth,labelfont=bf]{caption}
\usepackage{array} \usepackage{tabularx}

\begin{document}

\begin{landscape}
    \begin{table}[h!]
        \centering
         \captionsetup{width=0.9\columnwidth,labelfont=bf}
        \caption{Elemental composition (in wt.$\%$) of the nine alloys investigated in this work}
        \renewcommand{\arraystretch}{2}
        \begin{tabularx}{0.9\hsize}[h!]{ 
           >{\raggedright\arraybackslash}p{3.9cm} 
           >{\centering\arraybackslash}X
           >{\centering\arraybackslash}X
           >{\centering\arraybackslash}X
           >{\centering\arraybackslash}X
           >{\centering\arraybackslash}X
           >{\raggedright\arraybackslash}X } 
        \hline
            & \multicolumn{6}{c}{Results (wt.$\%$)} \\
            Alloy name & Ti & Nb & Ga & Cu & O & N \\
            (Ti-45Nb)-2Ga & 53.61 + 0.72 & 43.86 + 0.73 & 1.99 + 0.07 & & 0.099 + 0.010 & 0.002 + 0.000\\
            (Ti-45Nb)-4Ga & 52.58 + 0.35 & 42.77 + 0.24 & 3.87 + 0.05 & & 0.111 + 0.008 & 0.004 + 0.001 \\
            (Ti-45Nb)-6Ga & 51.51 + 0.36 & 41.97 + 0.33 & 5.83 + 0.05 & & 0.091 + 0.015 & 0.003 + 0.001 \\
            (Ti-45Nb)-8Ga & 50.23 + 0.59 & 41.03 + 0.31 & 7.89 + 0.12 & & 0.088 + 0.004 & 0.001 + 0.000 \\
\hline
        \end{tabularx}
        \label{tab:Elemental composition of the nine alloys}
    \end{table}
\end{landscape}

\end{document}

But this would influence the entire document, so all the captions of all images and tables. I would need a local modification — Ludovico, Dec 20, 2021 at 11:09

egreg · Accepted Answer · 2021-12-20 11:29:17Z

Just use the same trick as in the table, that is, use \hsize.

On the other hand, the table can easily fit the width.

\documentclass[12pt,twoside]{report}
\usepackage[utf8]{inputenc}
\usepackage{lscape}
\usepackage[width=0.9\textwidth,labelfont=bf]{caption}
\usepackage{array}
\usepackage{tabularx}
\usepackage{booktabs}
\usepackage{siunitx}

\begin{document}

\begin{landscape}
\begin{table}[!htp]
\centering
\captionsetup{width=0.9\hsize}

\caption{Elemental composition (in wt.$\%$) of the nine alloys investigated in this work}
\label{tab:Elemental composition of the nine alloys}

\begin{tabularx}{0.9\hsize}{ 
  >{\raggedright\arraybackslash}p{3.9cm} 
  >{\centering\arraybackslash}X
  >{\centering\arraybackslash}X
  >{\centering\arraybackslash}X
  >{\centering\arraybackslash}X
  >{\centering\arraybackslash}X
  >{\raggedright\arraybackslash}X
} 
\toprule
Alloy name & \multicolumn{6}{c}{Results (wt.$\%$)} \\
\cmidrule{2-7}
& Ti & Nb & Ga & Cu & O & N \\
\midrule
(Ti-45Nb)-2Ga & 53.61 + 0.72 & 43.86 + 0.73 & 1.99 + 0.07 & & 0.099 + 0.010 & 0.002 + 0.000 \\
\addlinespace
(Ti-45Nb)-4Ga & 52.58 + 0.35 & 42.77 + 0.24 & 3.87 + 0.05 & & 0.111 + 0.008 & 0.004 + 0.001 \\
\addlinespace
(Ti-45Nb)-6Ga & 51.51 + 0.36 & 41.97 + 0.33 & 5.83 + 0.05 & & 0.091 + 0.015 & 0.003 + 0.001 \\
\addlinespace
(Ti-45Nb)-8Ga & 50.23 + 0.59 & 41.03 + 0.31 & 7.89 + 0.12 & & 0.088 + 0.004 & 0.001 + 0.000 \\
\bottomrule
\end{tabularx}

\end{table}
\end{landscape}

\begin{table}[!htp]
\centering
\sisetup{input-signs=}
\setlength{\tabcolsep}{0pt}

\caption{Elemental composition (in wt.$\%$) of the nine alloys investigated in this work}
\label{tab:Elemental composition of the nine alloys-again}

\begin{tabular*}{0.9\textwidth}{
  @{\extracolsep{\fill}}
  l
  S[table-format=2.2{+}]
  S[table-format=2.2{+}]
  S[table-format=1.2{+}]
  S[table-format=2.2{+}] % missing data for Cu
  S[table-format=1.3{+}]
  S[table-format=1.3{+}]
  @{}
} 
\toprule
Alloy name & \multicolumn{6}{c}{Results (wt.$\%$)} \\
\cmidrule{2-7}
& {Ti} & {Nb} & {Ga} & {Cu} & {O} & {N} \\
\midrule
(Ti-45Nb)-2Ga & 53.61+ & 43.86+ & 1.99+ & & 0.099+ & 0.002+ \\
              &  0.72  &  0.73  & 0.07  & & 0.010  & 0.000  \\
\addlinespace
(Ti-45Nb)-4Ga & 52.58+ & 42.77+ & 3.87+ & & 0.111+ & 0.004+ \\
              &  0.35  &  0.24  & 0.05  & & 0.008  & 0.001  \\
\addlinespace
(Ti-45Nb)-6Ga & 51.51+ & 41.97+ & 5.83+ & & 0.091+ & 0.003+ \\
              &  0.36  &  0.33  & 0.05  & & 0.015  & 0.001  \\
\addlinespace
(Ti-45Nb)-8Ga & 50.23+ & 41.03+ & 7.89+ & & 0.088+ & 0.001+ \\
              &  0.59  &  0.31  & 0.12  & & 0.004  & 0.000  \\
\bottomrule
\end{tabular*}

\end{table}

\end{document}

Zarko · Accepted Answer · 2021-12-20 14:35:22Z

With use of talltblr table environment defined in the tabularray package you will not have problems with caption width:

\documentclass[12pt,twoside]{report}
%\usepackage[utf8]{inputenc}
\usepackage{pdflscape}
%\usepackage[width=0.9\linewidth, labelfont=bf]{caption} % <--- if need for other floats
other floats
\usepackage{tabularray}
\UseTblrLibrary{booktabs}

\usepackage[version=4]{mhchem}
\usepackage{siunitx}

\begin{document}

\begin{landscape}
    \begin{table}[ht]
    \SetTblrStyle{caption-tag}{font=\bfseries}
    \begin{talltblr}[
        caption={Elemental composition (in wt.$\%$) 
                 of the nine alloys investigated in this work},
        label={tab:Elemental composition of the nine alloys}
                ]
                {colspec={@{} c *{6}{X[c,$]} @{}}
                }
    \toprule
    & \SetCell[c=6]{c,mode=text}  Results (wt. \%)                      \\
    \cmidrule{2-7}
Alloy name  
    & \ce{Ti}    & \ce{Nb}    & \ce{Ga}   & \ce{Cu} 
                                            & \ce{O}      & \ce{N}      \\
    \midrule
\ce{(Ti-45Nb)-2Ga} 
    & 53.61+0.72 & 43.86+0.73 & 1.99+0.07 & & 0.099+0.010 & 0.002+0.000 \\
\ce{(Ti-45Nb)-4Ga}
    & 52.58+0.35 & 42.77+0.24 & 3.87+0.05 & & 0.111+0.008 & 0.004+0.001 \\
\ce{(Ti-45Nb)-6Ga} 
    & 51.51+0.36 & 41.97+0.33 & 5.83+0.05 & & 0.091+0.015 & 0.003+0.001 \\
\ce{(Ti-45Nb)-8Ga} 
    & 50.23+0.59 & 41.03+0.31 & 7.89+0.12 & & 0.088+0.004 & 0.001+0.000 \\
    \bottomrule
    \end{talltblr}
    \end{table}
\end{landscape}

\end{document}

Off-topic:
I took a liberty and made some small changes in your table design. As you can see, to your MWE and table were added:

booktabs package (loaded as `tabularray library) for horizontal rules in table
[version=4]{mhchem} package for chemistry formulae
to table are added rules at column headers and at table bottom
for this table is not needed caption package, however for other floats can be used as is suggested in @David Carlisle answer or in commented code line in above MWE

Bernard · Accepted Answer · 2021-12-20 11:09:28Z

A simple solution with floatrow:

\documentclass[12pt,twoside]{report}
\usepackage[utf8]{inputenc}
\usepackage{lscape}
\usepackage[labelfont=bf]{caption}%
\usepackage{array} \usepackage{tabularx}
\usepackage{floatrow}

\begin{document}

\begin{landscape}
    \begin{table}[h!]
        \centering
       \ttabbox[\FBwidth]{ \caption{Elemental composition (in wt.$\%$) of the nine alloys investigated in this work}\label{tab:Elemental composition of the nine alloys}}
       { \renewcommand{\arraystretch}{2}
        \begin{tabularx}{0.9\hsize}[h!]{
           >{\raggedright\arraybackslash}p{3.9cm}
           >{\centering\arraybackslash}X
           >{\centering\arraybackslash}X
           >{\centering\arraybackslash}X
           >{\centering\arraybackslash}X
           >{\centering\arraybackslash}X
           >{\raggedright\arraybackslash}X }
        \hline
            & \multicolumn{6}{c}{Results (wt.$\%$)} \\
            Alloy name & Ti & Nb & Ga & Cu & O & N \\
            (Ti-45Nb)-2Ga & 53.61 + 0.72 & 43.86 + 0.73 & 1.99 + 0.07 & & 0.099 + 0.010 & 0.002 + 0.000\\
            (Ti-45Nb)-4Ga & 52.58 + 0.35 & 42.77 + 0.24 & 3.87 + 0.05 & & 0.111 + 0.008 & 0.004 + 0.001 \\
            (Ti-45Nb)-6Ga & 51.51 + 0.36 & 41.97 + 0.33 & 5.83 + 0.05 & & 0.091 + 0.015 & 0.003 + 0.001 \\
            (Ti-45Nb)-8Ga & 50.23 + 0.59 & 41.03 + 0.31 & 7.89 + 0.12 & & 0.088 + 0.004 & 0.001 + 0.000 \\
\hline
        \end{tabularx}}

    \end{table}
\end{landscape}

\end{document}

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