Argthtjtr

How to set hline to be appropriate for the table?

documentclass[12pt,a3paper]{report}

usepackage{booktabs, makecell,amsmath, graphicx}

usepackage[output-decimal-marker={,}]{siunitx}

NewDocumentCommand{anote}{}{makebox[0pt][l]{$^*$}}

usepackage[margin=0.25in]{geometry}

usepackage{pdflscape}

usepackage{lscape}



begin{document}

begin{landscape}

begin{table}[h!!]

tiny

renewcommand{arraystretch}{1.45}

begin{tabular*}{textwidth}{@{extracolsep{fill}}  

  r|ccccccccccccccccccccc

}

Fit&&   1&  2&  3&  4&  5&  6&  7&  8&  9&  10& 11& 12& 13& 14& 15& 16& 17&\

hline

A&  54867,608227&   54867,600478&   54867,597004&   54867,598053&   54867,598004&   54867,597391&   54867,597323&   54867,595745&   54867,59403&    54867,595847&   54867,594425&   54867,595113&   54867,59502&    54868,48386&    54867,591154&   54867,591663&   54867,592885&   \



end{tabular*}

end{table} 



end{landscape}

end{document}  

This?

documentclass[12pt,a3paper]{report}

usepackage{booktabs, makecell,amsmath, graphicx}

usepackage[margin=.25in]{geometry}

usepackage{pdflscape}

usepackage{lscape}

begin{document}

begin{landscape}

begin{table}[h!!]

tiny

renewcommand{arraystretch}{1.45}

begin{tabular*}{linewidth}{r|ccccccccccccccccccccc}

Fit&&   1&  2&  3&  4&  5&  6&  7&  8&  9&  10& 11& 12& 13& 14& 15& 16& 17&\

hline

A&  54867,608227&   54867,600478&   54867,597004&   54867,598053&   54867,598004&   54867,597391&   54867,597323&   54867,595745&   54867,59403&    54867,595847&   54867,594425&   54867,595113&   54867,59502&    54868,48386&    54867,591154&   54867,591663&   54867,592885&   \



end{tabular*}

end{table} 

end{landscape}

end{document} 

which goes to the right margin

or this?

documentclass[12pt,a3paper]{report}

usepackage{booktabs, makecell,amsmath, graphicx}

usepackage[margin=.25in]{geometry}

usepackage{pdflscape}

usepackage{lscape}

begin{document}

begin{landscape}

begin{table}[h!!]

tiny

renewcommand{arraystretch}{1.45}

begin{tabular}{r|ccccccccccccccccccccc}

Fit&&   1&  2&  3&  4&  5&  6&  7&  8&  9&  10& 11& 12& 13& 14& 15& 16& 17&\

hline

A&  54867,608227&   54867,600478&   54867,597004&   54867,598053&   54867,598004&   54867,597391&   54867,597323&   54867,595745&   54867,59403&    54867,595847&   54867,594425&   54867,595113&   54867,59502&    54868,48386&    54867,591154&   54867,591663&   54867,592885&   \



end{tabular}

end{table} 

end{landscape}

end{document} 

which is better I think

It's not good practice to employ a tabular* environment, set its width to textwidth (or some other specific length), but then not let LaTeX adjust the amount of intercolumn whitespace via an @{extracolsep{fill}} directive, at the start of the second argument of the tabular* environment, in order to achieve the desired overall width.

There is no need to shrink the font size all the way to tiny -- footnotesize will do just fine. The difference, in terms of legibility, of shrinking something 20% linearly (aka footnotesize) or 50% linearly (aka tiny) is enormous.

documentclass[12pt]{report}

usepackage{rotating} % for "sidewaystable" environment

usepackage[margin=0.25in,a3paper]{geometry}

begin{document}



begin{sidewaystable}

setlengthtabcolsep{0pt}

footnotesize % no need for "tiny"

renewcommand{arraystretch}{1.45}

begin{tabular*}{textwidth}{@{extracolsep{fill}} r *{17}{c}}

Fit& 0&  1&  2&  3&  4& 5&  6&  7&  8&  9& 10& 11& 12& 13& 14& 15& 16\

hline

A&  

54867,608227&   54867,600478&   54867,597004&   54867,598053&   54867,598004&   

54867,597391&   54867,597323&   54867,595745&   54867,59403 &   54867,595847&   

54867,594425&   54867,595113&   54867,59502 &   54868,48386 &   54867,591154&   

54867,591663&   54867,592885 \

end{tabular*}

end{sidewaystable} 

end{document}