Mdthbs

How can I add the same text that appear inside the area surrounded by the arrow above the phrase "Item-based", meaning, {$mathrm{sim}(u_{a},u_{j})$} but inside the area surrounded by the arrow next to the text "User-based similarity measure"?

CODE

documentclass[tikz,border=3.14mm]{standalone}

usetikzlibrary{matrix}

begin{document}

    begin{tikzpicture}[font=footnotesize,b/.style={text=blue,font=bfseries}]

    matrix(m)[matrix of nodes,

    nodes={minimum size=5ex,anchor=center,draw},

    row 1/.style={nodes={draw=none,fill=none}},

    column 5/.style={nodes={fill=gray!30}},

    column 6/.style={nodes={fill=gray!30}},

    row 4/.style={nodes={fill=orange!30}},

    column 1/.style={nodes={draw=none,fill=none}},

    row sep=-pgflinewidth,

    column sep={-pgflinewidth},

    nodes in empty cells,

    ]{

        & $i_{1}$& $i_{2}$ & $i_{3}$ & dots &$ i_{k}$    & $ i_{a}$  & dots &$ i_{n}$ \ 

        $u_{1}$ & & 5 &   & 2 & 4    &    &  &  \ 

        $u_{2}$ & & 5 & 4 &  & 5 &   & 4  &\ 

        |[fill=none]|dots & &   &   &  &   & 1 & 1 & 2   \ 

        $u_{j}$ & 3 &  & |[b]| ? &  & |[b]| ? & 3 & &  0 \ 

        $u_{a}$ & & |[b]| ? & 2 &  & 4 &  &|[b]| ? &  \ 

        dots& & |[b]| ? & 2 &  & 4 &  &|[b]| ? &  \ 

        $u_{6}$ & & |[b]| ? & 2 &  & 4 &  &|[b]| ? &  \

    };

    draw[-latex](m-6-9.east)--+(1,0)node[above right]{User-based similarity measure}|-(m-5-9.east);

    node[left]at(m-4-1.west){Active User};

    draw[latex-] (m-1-6) -- ++ (-1,1) node[above left,align=left]

    {Item preference score is\ predicted for active user};

    draw[-latex]([xshift=-2pt]m-8-6.south east)--++(0,-1) -| 

    ([xshift=2pt]m-8-5.south west)

    node[pos=0.25,below]{Item-based}

    node[pos=0.25,above,font=tiny]{$mathrm{sim}(u_{a},u_{j})$};

    end{tikzpicture}

end{document}

Since the loop is built with the syntax |-, it is sufficient to use the specific placement of nodes on such paths. To know:

• 0.5 is the right angle


• .25 is half of the first segment.

For aesthetic reasons, I have divided the text into two lines.

draw[-latex,align=center](m-6-9.east)--+(1.8,0)node[above right]{User-based\ similarity measure}|-(m-5-9.east)node[pos=.25,left]{$mathrm{sim}(u_{a},u_{j})$};

documentclass[tikz,border=3.14mm]{standalone}

usetikzlibrary{matrix}

begin{document}

    begin{tikzpicture}[font=footnotesize,b/.style={text=blue,font=bfseries}]

    matrix(m)[matrix of nodes,

    nodes={minimum size=5ex,anchor=center,draw},

    row 1/.style={nodes={draw=none,fill=none}},

    column 5/.style={nodes={fill=gray!30}},

    column 6/.style={nodes={fill=gray!30}},

    row 4/.style={nodes={fill=orange!30}},

    column 1/.style={nodes={draw=none,fill=none}},

    row sep=-pgflinewidth,

    column sep={-pgflinewidth},

    nodes in empty cells,

    ]{

        & $i_{1}$& $i_{2}$ & $i_{3}$ & dots &$ i_{k}$    & $ i_{a}$  & dots &$ i_{n}$ \ 

        $u_{1}$ & & 5 &   & 2 & 4    &    &  &  \ 

        $u_{2}$ & & 5 & 4 &  & 5 &   & 4  &\ 

        |[fill=none]|dots & &   &   &  &   & 1 & 1 & 2   \ 

        $u_{j}$ & 3 &  & |[b]| ? &  & |[b]| ? & 3 & &  0 \ 

        $u_{a}$ & & |[b]| ? & 2 &  & 4 &  &|[b]| ? &  \ 

        dots& & |[b]| ? & 2 &  & 4 &  &|[b]| ? &  \ 

        $u_{6}$ & & |[b]| ? & 2 &  & 4 &  &|[b]| ? &  \

    };

    draw[-latex,align=center](m-6-9.east)--+(1.8,0)node[above right]{User-based\ similarity measure}|-(m-5-9.east)node[pos=.25,left]{$mathrm{sim}(u_{a},u_{j})$};

    node[left]at(m-4-1.west){Active User};

    draw[latex-] (m-1-6) -- ++ (-1,1) node[above left,align=left]

    {Item preference score is\ predicted for active user};

    draw[-latex]([xshift=-2pt]m-8-6.south east)--++(0,-1) -| 

    ([xshift=2pt]m-8-5.south west)

    node[pos=0.25,below]{Item-based}

    node[pos=0.25,above,font=tiny]{$mathrm{sim}(u_{a},u_{j})$};

    end{tikzpicture}

end{document}

This is more or less repetition from the answer that yielded your code. It is designed in such a way that, if you add more text, the arrow loop will adjust its size.

documentclass[tikz,border=3.14mm]{standalone}

usetikzlibrary{matrix}

begin{document}

    begin{tikzpicture}[font=footnotesize,b/.style={text=blue,font=bfseries}]

    matrix(m)[matrix of nodes,

    nodes={minimum size=5ex,anchor=center,draw},

    row 1/.style={nodes={draw=none,fill=none}},

    column 5/.style={nodes={fill=gray!30}},

    column 6/.style={nodes={fill=gray!30}},

    row 4/.style={nodes={fill=orange!30}},

    column 1/.style={nodes={draw=none,fill=none}},

    row sep=-pgflinewidth,

    column sep={-pgflinewidth},

    nodes in empty cells,

    ]{

        & $i_{1}$& $i_{2}$ & $i_{3}$ & dots &$ i_{k}$    & $ i_{a}$  & dots &$ i_{n}$ \ 

        $u_{1}$ & & 5 &   & 2 & 4    &    &  &  \ 

        $u_{2}$ & & 5 & 4 &  & 5 &   & 4  &\ 

        |[fill=none]|dots & &   &   &  &   & 1 & 1 & 2   \ 

        $u_{j}$ & 3 &  & |[b]| ? &  & |[b]| ? & 3 & &  0 \ 

        $u_{a}$ & & |[b]| ? & 2 &  & 4 &  &|[b]| ? &  \ 

        dots& & |[b]| ? & 2 &  & 4 &  &|[b]| ? &  \ 

        $u_{6}$ & & |[b]| ? & 2 &  & 4 &  &|[b]| ? &  \

    };

    node[left]at(m-4-1.west){Active User};

    path (m-6-9.south east) -- (m-5-9.north east) 

     node[midway,right,font=tiny] (ub) {$mathrm{sim}(u_{a},u_{j})$};

    draw[-latex](m-6-9.east) --

    ([xshift=2pt]ub.east|-m-6-9.east) |-(m-5-9.east)

    node[pos=0.25,right,align=left]  {User-based si-\milarity measure};

    ;

    draw[latex-] (m-1-6.north) -- ++ (-1,1) node[above left,align=left]

    {Item preference score is\ predicted for active user};

    draw[-latex]([xshift=-2pt]m-8-6.south east)--++(0,-1) -| 

    ([xshift=2pt]m-8-5.south west)

    node[pos=0.25,below]{Item-based}

    node[pos=0.25,above,font=tiny]{$mathrm{sim}(u_{a},u_{j})$};

    end{tikzpicture}

end{document}

To see this automatic adjustment, try

path (m-6-9.south east) -- (m-5-9.north east) 

 node[midway,right] (ub) {$mathrm{sim}(u_{a},u_{j})$};

to get

There is no hardcoded distance.