bar width not recognized in group plot

I am trying to put four bar charts within one groupplot. My file is

\documentclass[tikz,border=3pt]{standalone}
\usepackage{xcolor}
\usepackage{pgfplots,pgfplotstable}
\usepgfplotslibrary{groupplots}
\pgfplotsset{compat=1.4}
\pgfplotsset{every non boxed x axis/.append style={x axis line style=-},
every non boxed y axis/.append style={y axis line style=-}}
\renewcommand{\rmdefault}{phv}
% Arial font
\renewcommand{\sfdefault}{phv}
% Arial font
\definecolor{MediumSeaGreen}{rgb}{0.235294,0.701961,0.443137}
\definecolor{gold}{rgb}{1.000000,0.843137,0.000000}
\definecolor{LightBlue}{rgb}{0.678431,0.847059,0.901961}\definecolor{LightGrey}{rgb}{0.827451,0.827451,0.827451}
\definecolor{DarkGrey}{rgb}{0.662745,0.662745,0.662745}\definecolor{DarkGrey}{rgb}{0.662745,0.662745,0.662745}
\makeatletter
\pgfplotsset{/pgfplots/flexible xticklabels from table/.code n args={3}{%
\pgfplotstablegetcolumn{#2}\of{\coordinate@table}\to\pgfplots@xticklabels
\let\pgfplots@xticklabel=\pgfplots@user@ticklabel@list@x}}
\makeatother
\pgfplotscreateplotcyclelist{mycolor}{
{black,fill=MediumSeaGreen,mark=none},
{black,fill=gold,mark=none},
{black,fill=LightBlue,mark=none},
{black,fill=LightGrey,mark=none},
}
%
\begin{document}
\color{DarkGrey}
\pgfplotsset{ tick label style = {font=\tiny}, every axis/.append style={font=\tiny}}
\begin{tikzpicture}
\begin{groupplot}[
group style={group size=2 by 2,vertical sep=1.5cm},
width=8cm,
height=5cm,
major x tick style = transparent,
yticklabel={\ifdim\tick pt=0pt 0 \else\pgfmathprintnumber{\tick}\fi},
y tick label style={/pgf/number format/fixed,/pgf/number format/precision=1,
ylabel near ticks,
yticklabel pos=left,
/pgf/number format/fixed zerofill},
ybar=0pt,
cycle list name=mycolor,
ymajorgrids=false,
ylabel = {\%},
xtick={0,1,2,3,4,5,6,7,8,9,10,11},
flexible xticklabels from table={data}{month}{col sep=space},
x tick label style={rotate=270,anchor=west},
scaled y ticks = false,
enlarge x limits=0.05,
ymin=0,
ymax=.6]
%
\nextgroupplot[legend to name=grouplegend,]
\pgfplotsinvokeforeach {1,...,4}{\addplot[bar width=2pt] table [x expr={\coordindex}, y index=#1] {\mydata};}
%
\nextgroupplot[legend to name=grouplegend,]
%
\pgfplotsinvokeforeach {1}{\addplot[bar width=2pt,color=black,fill=MediumSeaGreen] table [x expr={\coordindex}, y index=#1] {\mydata};}
\pgfplotsinvokeforeach {2}{\addplot[bar width=2pt,color=black,fill=gold] table [x expr={\coordindex}, y index=#1] {\mydata};}
\pgfplotsinvokeforeach {3}{\addplot[bar width=2pt,color=black,fill=LightBlue] table [x expr={\coordindex}, y index=#1] {\mydata};}
\pgfplotsinvokeforeach {4}{\addplot[bar width=2pt,color=black,fill=LightGrey] table [x expr={\coordindex}, y index=#1] {\mydata};}
%
\nextgroupplot
%
\pgfplotsinvokeforeach {1}{\addplot[bar width=2pt,color=black,fill=MediumSeaGreen] table [x expr={\coordindex}, y index=#1] {\mydata};}
\pgfplotsinvokeforeach {2}{\addplot[bar width=2pt,color=black,fill=gold] table [x expr={\coordindex}, y index=#1] {\mydata};}
\pgfplotsinvokeforeach {3}{\addplot[bar width=2pt,color=black,fill=LightBlue] table [x expr={\coordindex}, y index=#1] {\mydata};}
\pgfplotsinvokeforeach {4}{\addplot[bar width=2pt,color=black,fill=LightGrey] table [x expr={\coordindex}, y index=#1] {\mydata};}
%
\nextgroupplot[legend to name=grouplegend,]
%
\pgfplotsinvokeforeach {1}{\addplot[bar width=2pt,color=black,fill=MediumSeaGreen] table [x expr={\coordindex}, y index=#1] {\mydata};}
\pgfplotsinvokeforeach {2}{\addplot[bar width=2pt,color=black,fill=gold] table [x expr={\coordindex}, y index=#1] {\mydata};}
\pgfplotsinvokeforeach {3}{\addplot[bar width=2pt,color=black,fill=LightBlue] table [x expr={\coordindex}, y index=#1] {\mydata};}
\pgfplotsinvokeforeach {4}{\addplot[bar width=2pt,color=black,fill=LightGrey] table [x expr={\coordindex}, y index=#1] {\mydata};}
%
\end{groupplot}
\end{tikzpicture}
\end{document}


and data input file is

month   a   b   c   d
OCT'12  0.62    0.02    3.48    0.22
NOV'12  0.70    0.00    3.58    0.19
DEC'12  0.37    0.00    2.21    0.20
JAN'13  0.37    0.18    3.41    0.25
FEB'13  0.29    1.09    4.04    0.18
MAR'13  0.10    1.12    3.54    0.26
APR'13  0.00    0.60    3.50    0.18
MAY'13  0.21    0.37    3.50    0.18
JUN'13  0.07    0.37    2.58    0.14
JUL'13  0.00    0.42    3.25    0.02
AUG'13  0.00    0.37    4.62    0.12
SEP'13  0.00    0.48    3.94    0.15


My first question is: If I set the bar width within the braces following \begin{group plot} I get an error because bar width is not recognized by group plot, so I have to set the value whenever I invoke every plot within the group. And my second question relates to the bar colors, invoking the color cycle I have defined in the preamble (\mycolor) with cycle list name=mycolor the colors are not recognized (look at the plot in the upper left corner, all bars are white, the pony way I have found to solve this is invoking each color for each bar as I have done in the other three plots, I am sure there is an easiest way to do this

• Welcome at Tex.sx! We would appreciate it if you could provide a complete minimal working example, including any referenced content files or 3rd party styles. – Christian Feuersänger Oct 27 '13 at 18:10
• It also seems as if you have two question in one: the first referring to the bar width and the second appears to be "how can I draw individually colored bars?". It would help you and others if you would make two separate questions, each with its own answer. – Christian Feuersänger Oct 27 '13 at 18:11

Regarding your first question, you can set the bar width after the \begin{group plot} by specifying /pgf/bar width=2pt.
Regarding your second question, you need to replace your \addplot[...] commands with \addplot+[...] (add the + sign). With \addplot+[...], options within the brackets are added to the currently set options in the groupplot style, without the + they replace these options.