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@@ -0,0 +1,82 @@
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+% defining the new dimensions and parameters
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+\newlength{\hatchspread}
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+\newlength{\hatchthickness}
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+\newlength{\hatchshift}
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+\newcommand{\hatchcolor}{}
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+% declaring the keys in tikz
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+\tikzset{hatchspread/.code={\setlength{\hatchspread}{#1}},
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+ hatchthickness/.code={\setlength{\hatchthickness}{#1}},
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+ hatchshift/.code={\setlength{\hatchshift}{#1}},% must be >= 0
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+ hatchcolor/.code={\renewcommand{\hatchcolor}{#1}}}
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+% setting the default values
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+\tikzset{hatchspread=6pt,
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+ hatchthickness=0.4pt,
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+ hatchshift=0pt,% must be >= 0
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+ hatchcolor=black}
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+% declaring the pattern
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+\pgfdeclarepatternformonly[\hatchspread,\hatchthickness,\hatchshift,\hatchcolor]% variables
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+ {custom north west lines}% name
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+ {\pgfqpoint{\dimexpr-2\hatchthickness}{\dimexpr-2\hatchthickness}}% lower left corner
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+ {\pgfqpoint{\dimexpr\hatchspread+2\hatchthickness}{\dimexpr\hatchspread+2\hatchthickness}}% upper right corner
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+ {\pgfqpoint{\dimexpr\hatchspread}{\dimexpr\hatchspread}}% tile size
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+ {% shape description
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+ \pgfsetlinewidth{\hatchthickness}
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+ \pgfpathmoveto{\pgfqpoint{0pt}{\dimexpr\hatchspread+\hatchshift}}
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+ \pgfpathlineto{\pgfqpoint{\dimexpr\hatchspread+0.15pt+\hatchshift}{-0.15pt}}
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+ \ifdim \hatchshift > 0pt
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+ \pgfpathmoveto{\pgfqpoint{0pt}{\hatchshift}}
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+ \pgfpathlineto{\pgfqpoint{\dimexpr0.15pt+\hatchshift}{-0.15pt}}
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+ \fi
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+ \pgfsetstrokecolor{\hatchcolor}
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+% \pgfsetdash{{1pt}{1pt}}{0pt}% dashing cannot work correctly in all situation this way
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+ \pgfusepath{stroke}
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+ }
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+
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+\begin{tikzpicture}
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+ \begin{axis}[
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+ legend pos=south west,
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+ axis x line=middle,
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+ axis y line=middle,
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+ %grid = major,
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+ %width=9cm,
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+ %height=4.5cm,
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+ grid style={dashed, gray!30},
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+ xmin=-1, % start the diagram at this x-coordinate
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+ xmax= 6, % end the diagram at this x-coordinate
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+ ymin=-0.25, % start the diagram at this y-coordinate
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+ ymax= 5, % end the diagram at this y-coordinate
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+ axis background/.style={fill=white},
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+ xlabel=$X_1$,
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+ ylabel=$X_2$,
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+ %xticklabels={,,},
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+ %yticklabels={,,},
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+ %xtick={-1,0,1,2,3,4,5},
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+ %ytick={-1,0,1,2,3,4,5},
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+ ticks=none,
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+ %tick align=outside,
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+ enlargelimits=true,
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+ tension=0.08]
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+ \addplot[hatchcolor=red,mark=none, pattern=custom north west lines, draw=none] coordinates {(0.5, 0) (0.5,5) (1.5,5) (1.5,0) };
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+ \addplot[red,mark=none, thick] coordinates {(0.5, 0) (0.5,5)};
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+ \addplot[red,mark=none, thick] coordinates {(1.5, 0) (1.5,5)};
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+
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+ \addplot[hatchcolor=red,mark=none, pattern=custom north west lines, draw=none] coordinates {(4.5, 0) (4.5,5) (5.5,5) (5.5,0) };
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+ \addplot[red,mark=none, thick] coordinates {(4.5, 0) (4.5,5)};
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+ \addplot[red,mark=none, thick] coordinates {(5.5, 0) (5.5,5)};
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+
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+
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+ \addplot[mark=none, dashed] coordinates {(1, 0) (1,3)};
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+ \addplot[mark=none, dashed] coordinates {(5, 0) (5,3)};
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+
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+ \addplot[mark=x] coordinates {(1, 3)};
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+ \addplot[mark=x] coordinates {(5, 3)};
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+ \node at (axis cs:1,3) [anchor=north west] {$(x_1, y_1)$};
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+ \node at (axis cs:5,3) [anchor=north west] {$(x_2, y_2)$};
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+
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+ \node at (axis cs:1,0) [anchor=north] {$x_1$};
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+ \node at (axis cs:5,0) [anchor=north] {$x_2$};
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+
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+ \node[red] at (axis cs:1,-0.3) [anchor=north] {$U_1 \times X_2$};
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+ \node[red] at (axis cs:5,-0.3) [anchor=north] {$U_2 \times X_2$};
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+ \end{axis}
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+\end{tikzpicture}
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