For the MWE below:
\documentclass{report}
\usepackage[left=2.5cm,right=2cm,top=2cm,bottom=2cm]{geometry}
\usepackage[T1]{fontenc}
\usepackage{pgfplots}
\begin{document}
\begin{figure}[H]
\centering
\begin{tikzpicture}
\begin{axis}[xmode=normal,ymode=log,
ybar,
scaled y ticks = true,
grid=both,
minor y tick num=5,
ylabel={Elapsed Time (in hours)},
xlabel={Number of Constraints},
width=1*\textwidth,
height=9cm,
bar width=3.5pt,
symbolic x coords={3,4,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35
},
xtick=data,
ymin=0
%nodes near coords,
%nodes near coords align={vertical},
]
\addplot [fill=red]
coordinates {(3,38.9575) (4,166.897) (6,53.63835) (7,39.6594) (8,82.1631) (9,40.22045) (10,37.2932) (11,131.62625) (12,472.6995) (13,149.837) (14,113.445) (15,108.474) (16,155.24455) (17,95.41392) (18,186.819) (19,153.383) (20,313.361) (21,180.1305) (22,401.3485) (23,1621.092) (24,1929.3) (25,899.283) (26,726.926) (27,1624.4) (28,870.348) (29,979.472) (30,869.418) (31,274.83) (32,1945.87) (33,1359.09) (34,891.24) (35,1625.31) };
\end{axis}
\end{tikzpicture}
\caption{The Elapsed Time vs. The Number of Constraints for the Halving Method}
\end{figure}
\end{document}
How can I draw a trend line on top of the bar chart ? By trend line I mean a line that touches to the top point of each bar on the chart.
Best Answer
You can put your data in a table to reuse it (I did via a couple of find/replace ops). I can't see how to generate the
symbolic x coords
from the first column (though I remember doing it). I've put also thesmooth
andline join
options to make the line less obstructive.