not able to get two flow charts side by side

Question

Hi All if any one can help me. I am using Latex first time. I have to add 2 flow chart side by side. But the code which I write prints the chart side by side but my second table of both charts are connected moreover they are not completely separate. does any one can help me how I can have complete separate side by side table I added the code as well which I used to compile this pdf in the pic.

documentclass[a4paper,10pt]{article}
usepackage[utf8]{inputenc}
usepackage{tikz}
usetikzlibrary{matrix,shapes,arrows,positioning,chains}
usetikzlibrary{shapes.geometric, arrows}

usetikzlibrary{shapes.geometric, arrows, shadows}
begin{document}
begin{figure}
centering
tikzstyle{startstop} = [trapezium, rounded corners, minimum width=3cm, minimum height=1cm,text centered, draw=black, fill=red!30, drop shadow]
tikzstyle{startstop} = [trapezium, rounded corners, minimum width=3cm, minimum height=1cm,text centered, draw=black, fill=red!30, drop shadow]

tikzstyle{io} = [trapezium, trapezium left angle=70, trapezium right angle=110, minimum width=2cm, minimum height=1cm, text centered, draw=black, fill=blue!30]
tikzstyle{process} = [rectangle, minimum width=3cm, minimum height=1cm, text centered, text width=3cm, draw=black, fill=orange!30]
tikzstyle{decision} = [diamond, minimum width=3cm, minimum height=1cm, text centered, draw=black, fill=green!30]
tikzstyle{arrow} = [thick,->,>=stealth]
tikzstyle{line} = [draw, -latex']

begin{tikzpicture}[node distance=2cm, auto]
begin{scope}[local bounding box=left]

node (start) [startstop] {Start};
node (in1) [io, below of=start] {CovidNon-Covid data};
node (pro1) [process, below of=in1] {Feature extraction};
node (in3) [process, below of=pro1] {Feature selection};

%node (pro2b) [process, right of=dec1, xshift=2cm] {};
node (out1) [io, below of=in3] {classifier};
node (stop) [startstop, below of=out1] {Results};

draw [arrow] (start) -- (in1);
draw [arrow] (in1) -- (pro1);
draw [arrow] (pro1) -- (in3);

draw [arrow] (in3) -- (out1);
draw [arrow] (out1) -- (stop);

end{scope}
draw[color=gray,thick](left.south west) rectangle (left.north east);
node[anchor=north,font=bfseries] at ([yshift=-2em]left.south) {flow 1 label};
begin{scope}[local bounding box=right,xshift=6cm]

node (start) [startstop] {Start};
node (in1) [io, below of=start] {Covid/Non-Covid data};
node (pro1) [process, below of=in1] {Feature extraction};
node (in3) [process, below of=pro1] {Feature selection};

%node (pro2b) [process, right of=dec1, xshift=2cm] {};
node (out1) [io, below of=in3] {classifier};
node (stop) [startstop, below of=out1] {Results};

draw [arrow] (start) -- (in1);
draw [arrow] (in1) -- (pro1);
draw [arrow] (pro1) -- (in3);

draw [arrow] (in3) -- (out1);
draw [arrow] (out1) -- (stop);
 % % % % % % % % % % % % % % % %      
end{scope}
draw[color=gray,thick](right.south west) rectangle (right.north east);
node[anchor=north,font=bfseries] at ([yshift=-2em]right.south) {flow 2 label};

end{tikzpicture}

end{figure}

end{document}

samcarter_is_at_topanswers.xyz · Answer

You can use the trapezium stretches=true option to save some space, then both diagrams will fit sie-by-side

is a special character in latex that indicates the start of macro names. You must not use it in text. To print a  use textbackslash.

documentclass[a4paper,10pt]{article}
usepackage[utf8]{inputenc}
usepackage{tikz}
usetikzlibrary{matrix,shapes,arrows,positioning,chains}
usetikzlibrary{shapes.geometric, arrows}

usetikzlibrary{shapes.geometric, arrows, shadows}
begin{document}
begin{figure}
centering
tikzstyle{startstop} = [trapezium, rounded corners, minimum width=3cm, minimum height=1cm,text centered, draw=black, fill=red!30, drop shadow]
tikzstyle{startstop} = [trapezium, rounded corners, minimum width=3cm, minimum height=1cm,text centered, draw=black, fill=red!30, drop shadow]

tikzstyle{io} = [trapezium, trapezium left angle=70, trapezium right angle=110, minimum width=2cm, minimum height=1cm, text centered, draw=black, fill=blue!30,trapezium stretches=true]
tikzstyle{process} = [rectangle, minimum width=3cm, minimum height=1cm, text centered, text width=3cm, draw=black, fill=orange!30]
tikzstyle{decision} = [diamond, minimum width=3cm, minimum height=1cm, text centered, draw=black, fill=green!30]
tikzstyle{arrow} = [thick,->,>=stealth]
tikzstyle{line} = [draw, -latex']

begin{tikzpicture}[node distance=2cm, auto]
begin{scope}[local bounding box=left]

node (start) [startstop] {Start};
node (in1) [io, below of=start] {Covidtextbackslash Non-Covid data};
node (pro1) [process, below of=in1] {Feature extraction};
node (in3) [process, below of=pro1] {Feature selection};