Organise arrows in organigram

Question

I made a organigram and everything works well except an arrow that I can not put it in a precise position as in the photo
This is my code :
documentclass[a4paper,12pt]{book}
usepackage[left=3.5cm,right=2.5cm,top=4cm,bottom=4cm]{geometry}
usepackage{tikz}
usetikzlibrary{shapes,arrows.meta,calc,fit,backgrounds,shapes.multipart,positioning}
begin{document}
begin{tikzpicture}[line width=.5pt, node distance = .5cm and 1.5cm,
block/.style = {inner sep=3pt,rectangle split, draw, rectangle split parts=2,
     text centered, rounded corners, minimum height=4em,rectangle split part fill={blue!20,white},font=fontsize{10}{0}
     selectfont},line/.style={draw, -{Latex[length=2.5mm,width=1.75mm]}}
                     ]
node (A)  [block] {initial};
node (B) [block,below = of A] {First};
node (C) [block,below = of B] {Second};
node (D) [block,below = of C] {Calculate};
node (E) [draw, diamond, aspect=5][below = of D] {if not};
node (F) [block,below = of E] {End};

draw [line,line width=1pt] (A) -- (B);
draw [line,line width=1pt] (B) -- (C);
draw [line,line width=1pt] (C) -- (D);
draw [line,line width=1pt] (D) -- (E);
draw [line,line width=1pt] (E) -- (F);

draw [line] (E) -| node[above,pos=0.25] {No} ([xshift=-4.50cm]A.south west) |- (A); 
end{tikzpicture}
end{document}

AndréC · Accepted Answer

It suffices to define an auxiliary node (here called (aux)) halfway between A and B with the calc library.
node (aux) at ($(A)!.5!(B)$){};%<-- auxiliary node

documentclass[a4paper,12pt]{book}
usepackage[left=3.5cm,right=2.5cm,top=4cm,bottom=4cm]{geometry}
usepackage{tikz}
usetikzlibrary{shapes,arrows.meta,calc,fit,backgrounds,shapes.multipart,positioning}
begin{document}
begin{tikzpicture}[line width=.5pt, node distance = .5cm and 1.5cm,
block/.style = {inner sep=3pt,rectangle split, draw, rectangle split parts=2,
     text centered, rounded corners, minimum height=4em,rectangle split part fill={blue!20,white},font=fontsize{10}{0}
     selectfont},line/.style={draw, -{Latex[length=2.5mm,width=1.75mm]}}
                     ]
node (A)  [block] {initial};
node (B) [block,below = 1cm of A] {First};
node (aux) at ($(A)!.5!(B)$){};%<-- auxiliary node
node (C) [block,below = of B] {Second};
node (D) [block,below = of C] {Calculate};
node (E) [draw, diamond, aspect=5][below = of D] {if not};
node (F) [block,below = of E] {End};

draw [line,line width=1pt] (A) -- (B);
draw [line,line width=1pt] (B) -- (C);
draw [line,line width=1pt] (C) -- (D);
draw [line,line width=1pt] (D) -- (E);
draw [line,line width=1pt] (E) -- (F);

draw [line] (E) -| node[above,pos=0.25] {No} ([xshift=-4.50cm]aux.south west) |- (aux); 
end{tikzpicture}
end{document}

Zarko · Answer

I would draw your flowchart as follows:
documentclass[a4paper,12pt]{book}
usepackage[left=3.5cm,right=2.5cm,top=4cm,bottom=4cm]{geometry}
usepackage{tikz}
usetikzlibrary{arrows.meta,
                calc, chains,
                quotes,
                shapes.geometric, shapes.multipart}

begin{document}
%---------------------------------------------------------------%
  begin{tikzpicture}[
  node distance = 8mm and 16mm,
    start chain = A going below,
   block/.style = {rectangle split, rectangle split parts=2,
                   draw, rounded corners, 
                   rectangle split part fill={blue!20,white},
                   text width = 24mm, align=center, font=small,
                   on chain=A, join=by arr},
decision/.style = {draw, sharp corners, diamond, 
                   inner xsep=-3pt, aspect=2},
     arr/.style = {draw, -{Latex[length=2.5mm,width=1.75mm]}}
                     ]
    begin{scope}[nodes=block]
node {initial};    % A-1
node {First};
node {Second};
node {Calculate};
node [decision, on chain=A] {if not};
node {End};        % A-6
    end{scope}
%
draw[arr] (A-5.west) -- node[above] {No} ++ (-1,0)  
                      |- ($(A-1.south)!0.5!(A-2.north)$);
path (A-5) -- node[left] {Yes} (A-6);
end{tikzpicture}
end{document}

Organise arrows in organigram

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